diff --git a/.gitignore b/.gitignore
index feb8d45a1ef..ecb3772cb70 100644
--- a/.gitignore
+++ b/.gitignore
@@ -45,3 +45,4 @@ lib/
 storybook-static/
 
 plans/
+output
diff --git a/apps/webapp/src/i18n/en-US.json b/apps/webapp/src/i18n/en-US.json
index d555ddea10a..a99e1a38bee 100644
--- a/apps/webapp/src/i18n/en-US.json
+++ b/apps/webapp/src/i18n/en-US.json
@@ -678,6 +678,11 @@
   "conversationCreatedYou": "You started a conversation with {users}",
   "conversationCreatedYouMore": "You started a conversation with {users}, and [showmore]{count} more[/showmore]",
   "conversationDeleteTimestamp": "Deleted: {date}",
+  "conversationDescriptionAddedYou": " added a group description",
+  "conversationDescriptionEditedYou": " edited the group description",
+  "conversationDescriptionLabel": "Description:",
+  "conversationDescriptionOptionalLabel": "Description (optional)",
+  "conversationDescriptionPlaceholder": "Enter a description",
   "conversationDetails1to1ReceiptsFirst": "If both sides turn on read receipts, you can see when messages are read.",
   "conversationDetails1to1ReceiptsHeadDisabled": "You have disabled read receipts",
   "conversationDetails1to1ReceiptsHeadEnabled": "You have enabled read receipts",
@@ -700,6 +705,8 @@
   "conversationDetailsActionTimedMessagesDisabled": "Self-deleting messages are off",
   "conversationDetailsActionUnblock": "Unblock",
   "conversationDetailsCloseLabel": "Close image details view",
+  "conversationDetailsDescription": "Description (optional)",
+  "conversationDetailsDescriptionPlaceholder": "Enter a description (maximum 200 characters)",
   "conversationDetailsGroupAdmin": "Group Admin",
   "conversationDetailsGroupAdminInfo": "When this is on, the admin can add or remove people and apps, update group settings, and change a participant’s role.",
   "conversationDetailsOff": "Off",
diff --git a/apps/webapp/src/i18n/pt-BR.json b/apps/webapp/src/i18n/pt-BR.json
index 926a8e32759..3a3388ba2f4 100644
--- a/apps/webapp/src/i18n/pt-BR.json
+++ b/apps/webapp/src/i18n/pt-BR.json
@@ -662,6 +662,7 @@
   "conversationContextMenuReply": "Responder",
   "conversationContextMenuUnlike": "Descurtir",
   "conversationCreateReceiptsEnabled": "As confirmações de leitura estão ligadas",
+  "conversationDescriptionLabel": "Descrição:",
   "conversationCreateTeam": "com [showmore]todos os membros[/showmore]",
   "conversationCreateTeamGuest": "com [showmore]todos os membros e um convidado[/showmore]",
   "conversationCreateTeamGuests": "com [showmore]todos os membros e {count} convidados[/showmore]",
@@ -699,6 +700,8 @@
   "conversationDetailsCloseLabel": "Fechar visualização de detalhes da imagem",
   "conversationDetailsGroupAdmin": "Administrador do Grupo",
   "conversationDetailsGroupAdminInfo": "When this is on, the admin can add or remove people and apps, update group settings, and change a participant’s role.",
+  "conversationDescriptionAddedYou": " adicionou uma descrição ao grupo",
+  "conversationDescriptionEditedYou": " editou a descrição do grupo",
   "conversationDetailsOff": "Desligado",
   "conversationDetailsOn": "Ligado",
   "conversationDetailsOptions": "Opções",
diff --git a/apps/webapp/src/script/components/Conversation/Conversation.tsx b/apps/webapp/src/script/components/Conversation/Conversation.tsx
index fa5a4bb127b..f8dca354470 100644
--- a/apps/webapp/src/script/components/Conversation/Conversation.tsx
+++ b/apps/webapp/src/script/components/Conversation/Conversation.tsx
@@ -154,6 +154,15 @@ export const Conversation = ({
     }
   }, [activeConversation, isVirtualizedMessagesListEnabled]);
 
+  useEffect(() => {
+    if (!activeConversation) {
+      return;
+    }
+
+    // TODO: Remove when description is part of the API Conversation payload
+    void conversationRepository.loadConversationDescription(activeConversation);
+  }, [activeConversation, conversationRepository]);
+
   const uploadImages = useCallback(
     (images: File[]) => {
       if (!activeConversation || isHittingUploadLimit(images, repositories.asset, translate)) {
diff --git a/apps/webapp/src/script/components/MessagesList/Message/MemberMessage.test.tsx b/apps/webapp/src/script/components/MessagesList/Message/MemberMessage.test.tsx
index 4693dcfed56..f1a0a23af6f 100644
--- a/apps/webapp/src/script/components/MessagesList/Message/MemberMessage.test.tsx
+++ b/apps/webapp/src/script/components/MessagesList/Message/MemberMessage.test.tsx
@@ -100,6 +100,66 @@ describe('MemberMessage', () => {
     expect(getByTestId('element-connected-message')).not.toBeNull();
   });
 
+  it('shows conversation description when group is created and description exists', () => {
+    const message = createMemberMessage({systemType: SystemMessageType.CONVERSATION_CREATE}, [generateUser()]);
+    const props = {
+      ...baseProps,
+      message,
+      conversationDescription: 'A useful group description',
+    };
+
+    const {getByTestId, getByText} = render(withTheme(<MemberMessage {...props} />));
+    expect(getByText('Description:')).toBeInTheDocument();
+    expect(getByText('A useful group description')).toBeInTheDocument();
+    expect(getByTestId('group-creation-description-label').nextElementSibling).toBe(
+      getByTestId('group-creation-description-text'),
+    );
+  });
+
+  it('renders conversation description headings, line breaks, and links like chat messages', () => {
+    const message = createMemberMessage({systemType: SystemMessageType.CONVERSATION_CREATE}, [generateUser()]);
+    const props = {
+      ...baseProps,
+      message,
+      conversationDescription: '# First line\nhttps://wire.com',
+    };
+
+    const {getByRole, getByTestId} = render(withTheme(<MemberMessage {...props} />));
+
+    const link = getByRole('link', {name: 'https://wire.com'});
+    const description = getByTestId('group-creation-description-text');
+    expect(link).toHaveAttribute('href', 'https://wire.com');
+    expect(link).toHaveAttribute('target', '_blank');
+    expect(description.querySelector('.md-heading--1')).toHaveTextContent('First line');
+    expect(description.innerHTML).toContain('<br>');
+  });
+
+  it('escapes html in the conversation description shown in chat', () => {
+    const message = createMemberMessage({systemType: SystemMessageType.CONVERSATION_CREATE}, [generateUser()]);
+    const props = {
+      ...baseProps,
+      message,
+      conversationDescription: '<img src=x onerror=alert(1)>\nhttps://wire.com',
+    };
+
+    const {getByTestId, getByText} = render(withTheme(<MemberMessage {...props} />));
+
+    expect(getByTestId('group-creation-description-text').querySelector('img')).toBeNull();
+    expect(getByText('<img src=x onerror=alert(1)>')).toBeInTheDocument();
+  });
+
+  it('does not show conversation description when group is created without description', () => {
+    const message = createMemberMessage({systemType: SystemMessageType.CONVERSATION_CREATE}, [generateUser()]);
+    const props = {
+      ...baseProps,
+      message,
+      conversationDescription: '',
+    };
+
+    const {queryByText} = render(withTheme(<MemberMessage {...props} />));
+    expect(queryByText('Description:')).not.toBeInTheDocument();
+  });
+
   it('shows self-deleting messages off banner when group is created and self-deleting messages are disabled', () => {
     const message = createMemberMessage({systemType: SystemMessageType.CONVERSATION_CREATE}, [generateUser()]);
     const props = {
diff --git a/apps/webapp/src/script/components/MessagesList/Message/MemberMessage.tsx b/apps/webapp/src/script/components/MessagesList/Message/MemberMessage.tsx
index 00050a42f05..f05643204cb 100644
--- a/apps/webapp/src/script/components/MessagesList/Message/MemberMessage.tsx
+++ b/apps/webapp/src/script/components/MessagesList/Message/MemberMessage.tsx
@@ -25,12 +25,19 @@ import {User} from 'Repositories/entity/User';
 import {SystemMessageType} from 'src/script/message/SystemMessageType';
 import {useApplicationContext} from 'src/script/page/RootProvider';
 import {useKoSubscribableChildren} from 'Util/componentUtil';
+import {renderMessage} from 'Util/messageRenderer';
 
 import {E2eEncryptionMessage} from './E2eEncryptionMessage/E2eEncryptionMessage';
 import {ConnectedMessage} from './MemberMessage/ConnectedMessage';
 import {MessageContent} from './MemberMessage/MessageContent';
 import {MessageTime} from './MessageTime';
 
+const PinIcon = () => (
+  <svg aria-hidden="true" width="16" height="16" viewBox="0 0 16 16">
+    <path d="M10.7 1.3 14.7 5.3 13.3 6.7 12.6 6 9.5 9.1 9.8 12.2 8.4 13.6 5.8 11 2.1 14.7 1.3 13.9 5 10.2 2.4 7.6 3.8 6.2 6.9 6.5 10 3.4 9.3 2.7 10.7 1.3Z" />
+  </svg>
+);
+
 interface MemberMessageProps {
   classifiedDomains?: string[];
   hasReadReceiptsTurnedOn: boolean;
@@ -42,6 +49,7 @@ interface MemberMessageProps {
   onClickParticipants: (participants: User[]) => void;
   shouldShowInvitePeople: boolean;
   conversationName: string;
+  conversationDescription?: string;
   isCellsConversation: boolean;
 }
 
@@ -56,6 +64,7 @@ export const MemberMessage = ({
   onClickCancelRequest,
   classifiedDomains,
   conversationName,
+  conversationDescription,
   isCellsConversation,
 }: MemberMessageProps) => {
   const {translate} = useApplicationContext();
@@ -73,6 +82,9 @@ export const MemberMessage = ({
   const cellsConversationLabel = translate('conversationCellsConversationEnabled');
   const receiptsEnabledLabel = translate('conversationCreateReceiptsEnabled');
   const timedMessagesDisabledLabel = translate('conversationDetailsActionTimedMessagesDisabled');
+  const hasConversationDescription = conversationDescription !== undefined && conversationDescription.length > 0;
+  const shouldShowDescription = isGroupCreation && hasConversationDescription;
+  const renderedConversationDescription = renderMessage(conversationDescription ?? '');
 
   const isConnectedMessage = [SystemMessageType.CONNECTION_ACCEPTED, SystemMessageType.CONNECTION_REQUEST].includes(
     message.memberMessageType,
@@ -103,6 +115,31 @@ export const MemberMessage = ({
         </div>
       )}
 
+      {shouldShowDescription && (
+        <div
+          className="message-header"
+          data-uie-name="label-group-creation-description"
+          role="status"
+          aria-live="polite"
+        >
+          <div
+            className="message-header-icon message-header-icon--svg message-header-icon--top text-foreground"
+            aria-hidden="true"
+          >
+            <PinIcon />
+          </div>
+          <div className="message-header-label message-header-label--description">
+            <strong data-uie-name="group-creation-description-label">
+              {translate('conversationDescriptionLabel')}
+            </strong>
+            <span
+              data-uie-name="group-creation-description-text"
+              dangerouslySetInnerHTML={{__html: renderedConversationDescription}}
+            />
+          </div>
+        </div>
+      )}
+
       {hasUsers && (
         <div className="message-header" role="status" aria-live="polite">
           <div className="message-header-icon message-header-icon--svg text-foreground" aria-hidden="true">
diff --git a/apps/webapp/src/script/components/MessagesList/Message/MessageWrapper.tsx b/apps/webapp/src/script/components/MessagesList/Message/MessageWrapper.tsx
index 1c143932252..a87e9bd2229 100644
--- a/apps/webapp/src/script/components/MessagesList/Message/MessageWrapper.tsx
+++ b/apps/webapp/src/script/components/MessagesList/Message/MessageWrapper.tsx
@@ -123,10 +123,11 @@ export const MessageWrapper = ({
       await messageRepository.retryUploadFile(conversation, file, firstAsset.isImage(), message.id);
     }
   };
-  const {display_name: displayName, hasGlobalMessageTimer} = useKoSubscribableChildren(conversation, [
-    'display_name',
-    'hasGlobalMessageTimer',
-  ]);
+  const {
+    display_name: displayName,
+    description: conversationDescription,
+    hasGlobalMessageTimer,
+  } = useKoSubscribableChildren(conversation, ['display_name', 'description', 'hasGlobalMessageTimer']);
   const isFileShareRestricted = !teamState.isFileSharingReceivingEnabled();
 
   const isCellsConversation =
@@ -262,6 +263,7 @@ export const MessageWrapper = ({
       <MemberMessage
         message={message}
         conversationName={displayName}
+        conversationDescription={conversationDescription}
         onClickInvitePeople={onClickInvitePeople}
         onClickParticipants={onClickParticipants}
         onClickCancelRequest={onClickCancelRequest}
diff --git a/apps/webapp/src/script/components/MessagesList/Message/SystemMessage/SystemMessage.test.tsx b/apps/webapp/src/script/components/MessagesList/Message/SystemMessage/SystemMessage.test.tsx
index f2cf4918c50..dd271f23969 100644
--- a/apps/webapp/src/script/components/MessagesList/Message/SystemMessage/SystemMessage.test.tsx
+++ b/apps/webapp/src/script/components/MessagesList/Message/SystemMessage/SystemMessage.test.tsx
@@ -19,14 +19,18 @@
 
 import {render, screen} from '@testing-library/react';
 
+import en from 'I18n/en-US.json';
+import {DescriptionUpdateMessage} from 'Repositories/entity/message/DescriptionUpdateMessage';
 import {MessageTimerUpdateMessage} from 'Repositories/entity/message/MessageTimerUpdateMessage';
 import {ReceiptModeUpdateMessage} from 'Repositories/entity/message/ReceiptModeUpdateMessage';
 import {RenameMessage} from 'Repositories/entity/message/RenameMessage';
-import {translate} from 'Util/localizerUtil';
+import {setStrings, translate} from 'Util/localizerUtil';
 import {translateForTest} from 'Util/test/translateForTest';
 
 import {SystemMessage} from './SystemMessage';
 
+setStrings({en});
+
 jest.mock('Components/icon', () => ({
   EditIcon: () => {
     return <span data-uie-name="editicon" className="editicon"></span>;
@@ -40,6 +44,7 @@ jest.mock('Components/icon', () => ({
   __esModule: true,
 }));
 
+
 describe('SystemMessage', () => {
   it('shows edit icon for RenameMessage', async () => {
     const message = new RenameMessage('new name', undefined, undefined, translateForTest);
@@ -50,6 +55,26 @@ describe('SystemMessage', () => {
     expect(screen.queryByTestId('editicon')).not.toBeNull();
   });
 
+  it('shows added description update without description body', async () => {
+    const message = new DescriptionUpdateMessage('Updated description', 'add', translate);
+
+    render(<SystemMessage message={message} />);
+
+    expect(screen.queryByTestId('element-message-system')).not.toBeNull();
+    expect(screen.queryByTestId('editicon')).not.toBeNull();
+    expect(screen.queryByText('Updated description')).not.toBeInTheDocument();
+    expect(screen.getByText(/added a group description/)).toBeInTheDocument();
+  });
+
+  it('shows edited description update without description body', async () => {
+    const message = new DescriptionUpdateMessage('Updated description', 'edit', translate);
+
+    render(<SystemMessage message={message} />);
+
+    expect(screen.queryByText('Updated description')).not.toBeInTheDocument();
+    expect(screen.getByText(/edited the group description/)).toBeInTheDocument();
+  });
+
   it('shows timer icon for MessageTimerUpdateMessage', async () => {
     const message = new MessageTimerUpdateMessage(0, translateForTest);
 
diff --git a/apps/webapp/src/script/components/MessagesList/Message/SystemMessage/SystemMessage.tsx b/apps/webapp/src/script/components/MessagesList/Message/SystemMessage/SystemMessage.tsx
index 4111f3b7513..a8fc7a8d288 100644
--- a/apps/webapp/src/script/components/MessagesList/Message/SystemMessage/SystemMessage.tsx
+++ b/apps/webapp/src/script/components/MessagesList/Message/SystemMessage/SystemMessage.tsx
@@ -20,6 +20,7 @@
 import {MLSVerified} from '@wireapp/react-ui-kit';
 
 import * as Icon from 'Components/icon';
+import {DescriptionUpdateMessage} from 'Repositories/entity/message/DescriptionUpdateMessage';
 import {E2EIVerificationMessage} from 'Repositories/entity/message/E2EIVerificationMessage';
 import {JoinedAfterMLSMigrationFinalisationMessage} from 'Repositories/entity/message/JoinedAfterMLSMigrationFinalisationMessage';
 import {MessageTimerUpdateMessage} from 'Repositories/entity/message/MessageTimerUpdateMessage';
@@ -52,6 +53,10 @@ export const SystemMessage = ({message}: SystemMessageProps) => {
     );
   }
 
+  if (message instanceof DescriptionUpdateMessage) {
+    return <SystemMessageBase message={message} isSenderNameVisible icon={<Icon.EditIcon />} />;
+  }
+
   if (message instanceof MessageTimerUpdateMessage) {
     return <SystemMessageBase message={message} isSenderNameVisible icon={<Icon.TimerIcon />} />;
   }
diff --git a/apps/webapp/src/script/components/Modals/CreateConversation/CreateConversationSteps/ConversationDetails/ConversationDetails.styles.ts b/apps/webapp/src/script/components/Modals/CreateConversation/CreateConversationSteps/ConversationDetails/ConversationDetails.styles.ts
index 8890928fbd0..c1e45c5e23b 100644
--- a/apps/webapp/src/script/components/Modals/CreateConversation/CreateConversationSteps/ConversationDetails/ConversationDetails.styles.ts
+++ b/apps/webapp/src/script/components/Modals/CreateConversation/CreateConversationSteps/ConversationDetails/ConversationDetails.styles.ts
@@ -89,3 +89,47 @@ export const groupsNotAllowedSectionCss: CSSObject = {
   marginTop: '35%',
   textAlign: 'center',
 };
+
+export const conversationDescriptionInputWrapperCss: CSSObject = {
+  '&:focus-within label': {
+    color: 'var(--accent-color-500)',
+  },
+  marginTop: '4px',
+  paddingBottom: '1rem',
+  width: '100%',
+};
+
+export const conversationDescriptionLabelCss: CSSObject = {
+  color: 'var(--text-input-color)',
+  display: 'block',
+  fontWeight: 'var(--font-weight-semibold)',
+  marginBottom: 2,
+};
+
+export const conversationDescriptionInputCss: CSSObject = {
+  '&::placeholder': {
+    color: 'var(--text-input-placeholder)',
+    opacity: 1,
+  },
+  '&:hover': {
+    borderColor: 'var(--text-input-border-hover)',
+  },
+  '&:focus, &:focus-visible, &:active': {
+    borderColor: 'var(--accent-color-500)',
+  },
+  background: 'var(--text-input-background)',
+  boxSizing: 'border-box',
+  border: '1px solid var(--text-input-border)',
+  borderRadius: 12,
+  color: 'var(--text-input-color)',
+  fontSize: 'var(--font-size-base)',
+  fontWeight: 'var(--font-weight-regular)',
+  lineHeight: 'var(--line-height-lg)',
+  marginLeft: 0,
+  marginRight: 0,
+  minHeight: 96,
+  outline: 'none',
+  padding: '12px 16px',
+  resize: 'vertical',
+  width: '100%',
+};
diff --git a/apps/webapp/src/script/components/Modals/CreateConversation/CreateConversationSteps/ConversationDetails/ConversationDetails.tsx b/apps/webapp/src/script/components/Modals/CreateConversation/CreateConversationSteps/ConversationDetails/ConversationDetails.tsx
index 54add7b3d4a..9c9fe92d113 100644
--- a/apps/webapp/src/script/components/Modals/CreateConversation/CreateConversationSteps/ConversationDetails/ConversationDetails.tsx
+++ b/apps/webapp/src/script/components/Modals/CreateConversation/CreateConversationSteps/ConversationDetails/ConversationDetails.tsx
@@ -23,7 +23,12 @@ import {UserState} from 'Repositories/user/userState';
 import {useApplicationContext} from 'src/script/page/RootProvider';
 
 import {ChannelSettings} from './ChannelSettings';
-import {groupsNotAllowedSectionCss} from './ConversationDetails.styles';
+import {
+  conversationDescriptionInputCss,
+  conversationDescriptionInputWrapperCss,
+  conversationDescriptionLabelCss,
+  groupsNotAllowedSectionCss,
+} from './ConversationDetails.styles';
 import {ConversationNameInput} from './ConversationNameInput';
 
 import {useCreateConversationModal} from '../../hooks/useCreateConversationModal';
@@ -32,7 +37,7 @@ import {Preference} from '../Preference';
 
 export const ConversationDetails = () => {
   const {translate} = useApplicationContext();
-  const {conversationType} = useCreateConversationModal();
+  const {conversationType, conversationDescription, setConversationDescription} = useCreateConversationModal();
   const userState = container.resolve(UserState);
   const selfUser = userState.self();
 
@@ -45,6 +50,23 @@ export const ConversationDetails = () => {
   ) : (
     <>
       <ConversationNameInput />
+      {conversationType === ConversationType.Group && (
+        <div css={conversationDescriptionInputWrapperCss}>
+          <label css={conversationDescriptionLabelCss} htmlFor="enter-group-description">
+            {translate('conversationDescriptionOptionalLabel')}
+          </label>
+          <textarea
+            css={conversationDescriptionInputCss}
+            id="enter-group-description"
+            data-uie-name="enter-group-description"
+            name="enter-group-description"
+            maxLength={200}
+            value={conversationDescription}
+            onChange={event => setConversationDescription(event.target.value)}
+            onBlur={event => setConversationDescription(event.target.value.trim())}
+          />
+        </div>
+      )}
       {conversationType === ConversationType.Group ? <Preference /> : <ChannelSettings />}
     </>
   );
diff --git a/apps/webapp/src/script/components/Modals/CreateConversation/hooks/useCreateConversation.ts b/apps/webapp/src/script/components/Modals/CreateConversation/hooks/useCreateConversation.ts
index 7b2f88bf191..10f9b79f27d 100644
--- a/apps/webapp/src/script/components/Modals/CreateConversation/hooks/useCreateConversation.ts
+++ b/apps/webapp/src/script/components/Modals/CreateConversation/hooks/useCreateConversation.ts
@@ -55,6 +55,7 @@ export const useCreateConversation = (nonFederatingParticipantsModalCopy: NonFed
   const {mainViewModel, translate} = useApplicationContext();
   const {
     conversationName,
+    conversationDescription,
     hideModal,
     showModal,
     selectedContacts,
@@ -169,6 +170,11 @@ export const useCreateConversation = (nonFederatingParticipantsModalCopy: NonFed
         },
       );
 
+      const trimmedDescription = conversationDescription.trim();
+      if (conversationType === ConversationType.Group && trimmedDescription.length > 0) {
+        await conversationRepository.updateConversationDescription(conversation, trimmedDescription);
+      }
+
       setCurrentSidebarTab(SidebarTabs.RECENT);
 
       if (isKeyboardEvent(event)) {
diff --git a/apps/webapp/src/script/components/Modals/CreateConversation/hooks/useCreateConversationModal.ts b/apps/webapp/src/script/components/Modals/CreateConversation/hooks/useCreateConversationModal.ts
index 0de0a224545..8bf729d894d 100644
--- a/apps/webapp/src/script/components/Modals/CreateConversation/hooks/useCreateConversationModal.ts
+++ b/apps/webapp/src/script/components/Modals/CreateConversation/hooks/useCreateConversationModal.ts
@@ -36,6 +36,7 @@ import {
 type CreateConversationModalState = {
   isOpen: boolean;
   conversationName: string;
+  conversationDescription: string;
   access: ConversationAccess;
   moderator: ADD_PERMISSION;
   chatHistory: ChatHistory;
@@ -58,6 +59,7 @@ type CreateConversationModalState = {
   showModal: () => void;
   hideModal: () => void;
   setConversationName: (name: string) => void;
+  setConversationDescription: (description: string) => void;
   setAccess: (access: ConversationAccess) => void;
   setModerator: (access: ADD_PERMISSION) => void;
   setChatHistory: (history: ChatHistory) => void;
@@ -88,6 +90,7 @@ type CreateConversationModalState = {
 const initialState = {
   isOpen: false,
   conversationName: '',
+  conversationDescription: '',
   access: ConversationAccess.Private,
   moderator: ADD_PERMISSION.EVERYONE,
   chatHistory: ChatHistory.Off,
@@ -115,6 +118,7 @@ export const useCreateConversationModal = create<CreateConversationModalState>(s
   showModal: () => set(state => ({...state, isOpen: true})),
   hideModal: () => set({...initialState}),
   setConversationName: (name: string) => set({conversationName: name}),
+  setConversationDescription: (description: string) => set({conversationDescription: description}),
   setAccess: (access: ConversationAccess) =>
     set(state => ({
       access,
diff --git a/apps/webapp/src/script/components/Modals/GroupCreation/GroupCreationModal.tsx b/apps/webapp/src/script/components/Modals/GroupCreation/GroupCreationModal.tsx
index 1e7397fafaa..ae7bbfb3b1e 100644
--- a/apps/webapp/src/script/components/Modals/GroupCreation/GroupCreationModal.tsx
+++ b/apps/webapp/src/script/components/Modals/GroupCreation/GroupCreationModal.tsx
@@ -139,6 +139,7 @@ const GroupCreationModal = ({
   );
   const [nameError, setNameError] = useState<string>('');
   const [groupName, setGroupName] = useState<string>('');
+  const [groupDescription, setGroupDescription] = useState<string>('');
   const [participantsInput, setParticipantsInput] = useState<string>('');
   const [groupCreationState, setGroupCreationState] = useState<GroupCreationModalState>(
     GroupCreationModalState.DEFAULT,
@@ -235,6 +236,7 @@ const GroupCreationModal = ({
     setIsCreatingConversation(false);
     setNameError('');
     setGroupName('');
+    setGroupDescription('');
     setParticipantsInput('');
     setSelectedContacts([]);
     setGroupCreationState(GroupCreationModalState.DEFAULT);
@@ -259,6 +261,11 @@ const GroupCreationModal = ({
           },
         );
 
+        const trimmedDescription = groupDescription.trim();
+        if (trimmedDescription.length > 0) {
+          await conversationRepository.updateConversationDescription(conversation, trimmedDescription);
+        }
+
         setCurrentSidebarTab(SidebarTabs.RECENT);
 
         if (isKeyboardEvent(event)) {
@@ -269,6 +276,7 @@ const GroupCreationModal = ({
       } catch (error: unknown) {
         if (isNonFederatingBackendsError(error)) {
           const tempName = groupName;
+          const tempDescription = groupDescription;
           setIsShown(false);
 
           const backendString = error.backends.join(', and ');
@@ -285,6 +293,7 @@ const GroupCreationModal = ({
                 text: translate('groupCreationPreferencesNonFederatingEditList'),
                 action: () => {
                   setGroupName(tempName);
+                  setGroupDescription(tempDescription);
                   setIsShown(true);
                   setIsCreatingConversation(false);
                   setGroupCreationState(GroupCreationModalState.PARTICIPANTS);
@@ -511,6 +520,22 @@ const GroupCreationModal = ({
               />
             </div>
 
+            <div className="modal-input-wrapper">
+              <label className="label-medium group-creation__description-label" htmlFor="enter-group-description">
+                {translate('conversationDescriptionOptionalLabel')}
+              </label>
+              <textarea
+                className="modal__input reset-textarea group-creation__description-input"
+                id="enter-group-description"
+                data-uie-name="enter-group-description"
+                name="enter-group-description"
+                maxLength={200}
+                value={groupDescription}
+                onChange={event => setGroupDescription(event.target.value)}
+                onBlur={event => setGroupDescription(event.target.value.trim())}
+              />
+            </div>
+
             {isTeam && (
               <>
                 <p
diff --git a/apps/webapp/src/script/message/SystemMessageType.ts b/apps/webapp/src/script/message/SystemMessageType.ts
index 2f9650e42c3..2825271def6 100644
--- a/apps/webapp/src/script/message/SystemMessageType.ts
+++ b/apps/webapp/src/script/message/SystemMessageType.ts
@@ -26,6 +26,7 @@ export enum SystemMessageType {
   CONNECTION_REQUEST = 'connecting',
   CONVERSATION_CREATE = 'created-group',
   CONVERSATION_DELETE = 'deleted-group',
+  CONVERSATION_DESCRIPTION_UPDATE = 'description-update',
   CONVERSATION_MESSAGE_TIMER_UPDATE = 'message-timer-update',
   CONVERSATION_RECEIPT_MODE_UPDATE = 'receipt-mode-update',
   CONVERSATION_RENAME = 'rename',
diff --git a/apps/webapp/src/script/page/RightSidebar/conversationDetails/components/conversationDetailsDescription/conversationDetailsDescription.test.tsx b/apps/webapp/src/script/page/RightSidebar/conversationDetails/components/conversationDetailsDescription/conversationDetailsDescription.test.tsx
new file mode 100644
index 00000000000..7f717716de1
--- /dev/null
+++ b/apps/webapp/src/script/page/RightSidebar/conversationDetails/components/conversationDetailsDescription/conversationDetailsDescription.test.tsx
@@ -0,0 +1,255 @@
+/*
+ * Wire
+ * Copyright (C) 2026 Wire Swiss GmbH
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see http://www.gnu.org/licenses/.
+ *
+ */
+
+import {fireEvent, render, screen} from '@testing-library/react';
+import {userEvent} from '@testing-library/user-event';
+
+import {ConversationDetailsDescription} from './conversationDetailsDescription';
+
+const MAX_DESCRIPTION_LENGTH = 200;
+
+describe('ConversationDetailsDescription', () => {
+  const onDescriptionChange = jest.fn();
+
+  afterEach(() => {
+    jest.clearAllMocks();
+  });
+
+  describe('filled state', () => {
+    it('renders the description heading and text', () => {
+      const description = 'This is the channel description';
+
+      render(<ConversationDetailsDescription description={description} onDescriptionChange={onDescriptionChange} />);
+
+      expect(screen.getByText('conversationDetailsDescription')).not.toBeNull();
+      expect(screen.getByText(description)).not.toBeNull();
+    });
+  });
+
+  describe('empty state', () => {
+    it('renders the placeholder when description is empty', () => {
+      render(<ConversationDetailsDescription description="" onDescriptionChange={onDescriptionChange} />);
+
+      expect(screen.getByTestId('conversation-details-description')).not.toBeNull();
+      expect(screen.getByText('conversationDetailsDescriptionPlaceholder')).not.toBeNull();
+    });
+
+    it('renders the placeholder when description is undefined', () => {
+      render(<ConversationDetailsDescription onDescriptionChange={onDescriptionChange} />);
+
+      expect(screen.getByText('conversationDetailsDescriptionPlaceholder')).not.toBeNull();
+    });
+  });
+
+  describe('hover state', () => {
+    it('shows the edit icon on hover when description exists and editing is allowed', async () => {
+      const description = 'Some description';
+      render(<ConversationDetailsDescription description={description} onDescriptionChange={onDescriptionChange} />);
+
+      const section = screen.getByTestId('conversation-details-description');
+
+      expect(screen.queryByTestId('description-edit-icon')).toBeNull();
+
+      fireEvent.mouseEnter(section);
+
+      expect(screen.getByTestId('description-edit-icon')).not.toBeNull();
+
+      fireEvent.mouseLeave(section);
+
+      expect(screen.queryByTestId('description-edit-icon')).toBeNull();
+    });
+
+    it('does not show the edit icon when editing is not allowed', () => {
+      const description = 'Some description';
+      render(
+        <ConversationDetailsDescription
+          canEdit={false}
+          description={description}
+          onDescriptionChange={onDescriptionChange}
+        />,
+      );
+
+      fireEvent.mouseEnter(screen.getByTestId('conversation-details-description'));
+
+      expect(screen.queryByTestId('description-edit-icon')).toBeNull();
+    });
+
+    it('enters edit mode when clicking the edit icon', async () => {
+      const description = 'Some description';
+      render(<ConversationDetailsDescription description={description} onDescriptionChange={onDescriptionChange} />);
+
+      const section = screen.getByTestId('conversation-details-description');
+      fireEvent.mouseEnter(section);
+
+      const editIcon = screen.getByTestId('description-edit-icon');
+      await userEvent.click(editIcon);
+
+      expect(screen.getByTestId('description-textarea')).not.toBeNull();
+    });
+  });
+
+  describe('rendered description', () => {
+    it('renders line breaks and links like chat messages', () => {
+      const description = 'First line\nhttps://wire.com';
+
+      render(<ConversationDetailsDescription description={description} onDescriptionChange={onDescriptionChange} />);
+
+      const link = screen.getByRole('link', {name: 'https://wire.com'});
+      expect(link).toHaveAttribute('href', 'https://wire.com');
+      expect(link).toHaveAttribute('target', '_blank');
+      expect(screen.getByTestId('description-text').innerHTML).toContain('First line<br>');
+    });
+
+    it('renders markdown-like headings, lists, quotes, and links like chat messages', () => {
+      render(
+        <ConversationDetailsDescription
+          description={'# Title\n- First item\n> Important\n[Wire](https://wire.com)'}
+          onDescriptionChange={onDescriptionChange}
+        />,
+      );
+
+      const descriptionText = screen.getByTestId('description-text');
+      const link = screen.getByRole('link', {name: 'Wire'});
+
+      expect(descriptionText.querySelector('.md-heading--1')).not.toBeNull();
+      expect(descriptionText.querySelector('li')).toHaveTextContent('First item');
+      expect(descriptionText.querySelector('.md-blockquote')).toHaveTextContent('Important');
+      expect(link).toHaveAttribute('href', 'https://wire.com');
+    });
+
+    it('escapes html when rendering the description', () => {
+      render(
+        <ConversationDetailsDescription
+          description={'<img src=x onerror=alert(1)>\nhttps://wire.com'}
+          onDescriptionChange={onDescriptionChange}
+        />,
+      );
+
+      expect(screen.getByTestId('description-text').querySelector('img')).toBeNull();
+      expect(screen.getByText('<img src=x onerror=alert(1)>')).not.toBeNull();
+    });
+  });
+
+  describe('editing state', () => {
+    it('enters edit mode when clicking the description text and editing is allowed', async () => {
+      const description = 'Existing description';
+      render(<ConversationDetailsDescription description={description} onDescriptionChange={onDescriptionChange} />);
+
+      const descriptionText = screen.getByText(description);
+      await userEvent.click(descriptionText);
+
+      const textarea = screen.getByTestId('description-textarea');
+      expect(textarea).not.toBeNull();
+      expect(textarea).toHaveValue(description);
+    });
+
+    it('does not enter edit mode when clicking description text and editing is not allowed', async () => {
+      const description = 'Existing description';
+      render(
+        <ConversationDetailsDescription
+          canEdit={false}
+          description={description}
+          onDescriptionChange={onDescriptionChange}
+        />,
+      );
+
+      await userEvent.click(screen.getByText(description));
+
+      expect(screen.queryByTestId('description-textarea')).toBeNull();
+    });
+
+    it('enters edit mode when clicking the placeholder', async () => {
+      render(<ConversationDetailsDescription description="" onDescriptionChange={onDescriptionChange} />);
+
+      const placeholder = screen.getByText('conversationDetailsDescriptionPlaceholder');
+      await userEvent.click(placeholder);
+
+      expect(screen.getByTestId('description-textarea')).not.toBeNull();
+    });
+
+    it('saves on blur and calls onDescriptionChange', async () => {
+      const description = 'Old description';
+      render(<ConversationDetailsDescription description={description} onDescriptionChange={onDescriptionChange} />);
+
+      await userEvent.click(screen.getByText(description));
+
+      const textarea = screen.getByTestId('description-textarea');
+      await userEvent.clear(textarea);
+      await userEvent.type(textarea, 'New description');
+
+      fireEvent.blur(textarea);
+
+      expect(onDescriptionChange).toHaveBeenCalledWith('New description');
+    });
+
+    it('allows multiple lines and saves them on blur', async () => {
+      const description = 'Old description';
+      render(<ConversationDetailsDescription description={description} onDescriptionChange={onDescriptionChange} />);
+
+      await userEvent.click(screen.getByText(description));
+
+      const textarea = screen.getByTestId('description-textarea');
+      await userEvent.clear(textarea);
+      fireEvent.change(textarea, {target: {value: 'First line\nSecond line'}});
+
+      expect(onDescriptionChange).not.toHaveBeenCalled();
+
+      fireEvent.blur(textarea);
+
+      expect(onDescriptionChange).toHaveBeenCalledWith('First line\nSecond line');
+    });
+
+    it('cancels editing on Escape key without saving', async () => {
+      const description = 'Original text';
+      render(<ConversationDetailsDescription description={description} onDescriptionChange={onDescriptionChange} />);
+
+      await userEvent.click(screen.getByText(description));
+
+      const textarea = screen.getByTestId('description-textarea');
+      await userEvent.clear(textarea);
+      await userEvent.type(textarea, 'Changed text');
+      await userEvent.keyboard('{Escape}');
+
+      expect(onDescriptionChange).not.toHaveBeenCalled();
+      expect(screen.queryByTestId('description-textarea')).toBeNull();
+      expect(screen.getByText(description)).not.toBeNull();
+    });
+
+    it('does not call onDescriptionChange when value is unchanged', async () => {
+      const description = 'Same text';
+      render(<ConversationDetailsDescription description={description} onDescriptionChange={onDescriptionChange} />);
+
+      await userEvent.click(screen.getByText(description));
+
+      const textarea = screen.getByTestId('description-textarea');
+      fireEvent.blur(textarea);
+
+      expect(onDescriptionChange).not.toHaveBeenCalled();
+    });
+
+    it('enforces the max character limit', async () => {
+      render(<ConversationDetailsDescription description="" onDescriptionChange={onDescriptionChange} />);
+
+      await userEvent.click(screen.getByText('conversationDetailsDescriptionPlaceholder'));
+
+      const textarea = screen.getByTestId('description-textarea');
+      expect(textarea).toHaveAttribute('maxLength', String(MAX_DESCRIPTION_LENGTH));
+    });
+  });
+});
diff --git a/apps/webapp/src/script/page/RightSidebar/conversationDetails/components/conversationDetailsDescription/conversationDetailsDescription.tsx b/apps/webapp/src/script/page/RightSidebar/conversationDetails/components/conversationDetailsDescription/conversationDetailsDescription.tsx
new file mode 100644
index 00000000000..7a4651e8f61
--- /dev/null
+++ b/apps/webapp/src/script/page/RightSidebar/conversationDetails/components/conversationDetailsDescription/conversationDetailsDescription.tsx
@@ -0,0 +1,163 @@
+/*
+ * Wire
+ * Copyright (C) 2026 Wire Swiss GmbH
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see http://www.gnu.org/licenses/.
+ *
+ */
+
+import {FC, KeyboardEvent, MouseEvent, useEffect, useRef, useState} from 'react';
+
+import * as Icon from 'Components/icon';
+import {isEnterKey, isEscapeKey} from 'Util/keyboardUtil';
+import {translate} from 'Util/localizerUtil';
+import {renderMessage} from 'Util/messageRenderer';
+
+const MAX_DESCRIPTION_LENGTH = 200;
+
+interface ConversationDetailsDescriptionProps {
+  canEdit?: boolean;
+  description?: string;
+  onDescriptionChange: (description: string) => void;
+}
+
+const ConversationDetailsDescription: FC<ConversationDetailsDescriptionProps> = ({
+  canEdit = true,
+  description = '',
+  onDescriptionChange,
+}) => {
+  const [isEditing, setIsEditing] = useState(false);
+  const [isHovered, setIsHovered] = useState(false);
+  const [draftValue, setDraftValue] = useState(description);
+  const textareaRef = useRef<HTMLTextAreaElement>(null);
+
+  useEffect(() => {
+    setDraftValue(description);
+  }, [description]);
+
+  useEffect(() => {
+    if (isEditing && textareaRef.current) {
+      textareaRef.current.focus();
+    }
+  }, [isEditing]);
+
+  const startEditing = () => {
+    if (!canEdit) {
+      return;
+    }
+
+    setDraftValue(description);
+    setIsEditing(true);
+  };
+
+  const saveDescription = () => {
+    setIsEditing(false);
+    const trimmed = draftValue.trim();
+
+    if (trimmed !== description) {
+      onDescriptionChange(trimmed);
+    }
+  };
+
+  const cancelEditing = () => {
+    setDraftValue(description);
+    setIsEditing(false);
+  };
+
+  const handleKeyDown = (event: KeyboardEvent<HTMLTextAreaElement>) => {
+    if (isEscapeKey(event)) {
+      event.preventDefault();
+      cancelEditing();
+    }
+  };
+
+  const handleContentClick = (event: MouseEvent<HTMLDivElement>) => {
+    const target = event.target as HTMLElement;
+
+    if (target.closest('a')) {
+      return;
+    }
+
+    startEditing();
+  };
+
+  const handleContentKeyDown = (event: KeyboardEvent<HTMLDivElement>) => {
+    if (isEnterKey(event)) {
+      event.preventDefault();
+      startEditing();
+    }
+  };
+
+  const hasDescription = description.length > 0;
+  const renderedDescription = renderMessage(description);
+
+  return (
+    <div
+      className="conversation-details__description"
+      data-uie-name="conversation-details-description"
+      onMouseEnter={() => setIsHovered(true)}
+      onMouseLeave={() => setIsHovered(false)}
+    >
+      <div className="conversation-details__description-label">
+        <h3 className="conversation-details__description-heading">{translate('conversationDetailsDescription')}</h3>
+        {canEdit && isHovered && !isEditing && hasDescription && (
+          <button
+            type="button"
+            className="conversation-details__description-edit-button"
+            data-uie-name="description-edit-icon"
+            onClick={startEditing}
+          >
+            <Icon.EditIcon className="conversation-details__description-edit-icon" />
+          </button>
+        )}
+      </div>
+
+      {isEditing ? (
+        <textarea
+          ref={textareaRef}
+          className="conversation-details__description-input"
+          data-uie-name="description-textarea"
+          value={draftValue}
+          maxLength={MAX_DESCRIPTION_LENGTH}
+          onChange={event => setDraftValue(event.target.value)}
+          onBlur={saveDescription}
+          onKeyDown={handleKeyDown}
+        />
+      ) : (
+        <div
+          className="conversation-details__description-content"
+          onClick={canEdit ? handleContentClick : undefined}
+          onKeyDown={canEdit ? handleContentKeyDown : undefined}
+          data-uie-name="description-content"
+          role={canEdit ? 'button' : undefined}
+          tabIndex={canEdit ? 0 : undefined}
+        >
+          {hasDescription ? (
+            <div
+              className="conversation-details__description-text"
+              data-uie-name="description-text"
+              dangerouslySetInnerHTML={{__html: renderedDescription}}
+            />
+          ) : (
+            <p className="conversation-details__description-placeholder">
+              {translate('conversationDetailsDescriptionPlaceholder')}
+            </p>
+          )}
+        </div>
+      )}
+    </div>
+  );
+};
+
+export {ConversationDetailsDescription};
diff --git a/apps/webapp/src/script/page/RightSidebar/conversationDetails/components/conversationDetailsDescription/index.ts b/apps/webapp/src/script/page/RightSidebar/conversationDetails/components/conversationDetailsDescription/index.ts
new file mode 100644
index 00000000000..bbf3b2305be
--- /dev/null
+++ b/apps/webapp/src/script/page/RightSidebar/conversationDetails/components/conversationDetailsDescription/index.ts
@@ -0,0 +1,20 @@
+/*
+ * Wire
+ * Copyright (C) 2026 Wire Swiss GmbH
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see http://www.gnu.org/licenses/.
+ *
+ */
+
+export {ConversationDetailsDescription} from './conversationDetailsDescription';
diff --git a/apps/webapp/src/script/page/RightSidebar/conversationDetails/conversationDetails.test.tsx b/apps/webapp/src/script/page/RightSidebar/conversationDetails/conversationDetails.test.tsx
index e0fc3134877..a1daa6e2087 100644
--- a/apps/webapp/src/script/page/RightSidebar/conversationDetails/conversationDetails.test.tsx
+++ b/apps/webapp/src/script/page/RightSidebar/conversationDetails/conversationDetails.test.tsx
@@ -103,6 +103,8 @@ const getDefaultParams = () => {
       getNextConversation: () =>
         Promise.resolve(new Conversation('', '', CONVERSATION_PROTOCOL.PROTEUS, translateForTest)),
       refreshUnavailableParticipants: () => Promise.resolve(),
+      loadConversationDescription: () => {},
+      updateConversationDescription: () => Promise.resolve(),
       conversationRoleRepository: conversationRoleRepository as ConversationRoleRepository,
     } as unknown as ConversationRepository,
     integrationRepository: {getServiceFromUser: (): null => null} as unknown as IntegrationRepository,
@@ -120,6 +122,34 @@ const getDefaultParams = () => {
 };
 
 describe('ConversationDetails', () => {
+  it('renders the channel description section for group conversations', () => {
+    const conversation = new Conversation();
+    conversation.type(CONVERSATION_TYPE.REGULAR);
+    const otherUser = new User('other-user');
+    jest.spyOn(otherUser as any, 'isConnected').mockReturnValue(true);
+    conversation.participating_user_ets([otherUser]);
+
+    const defaultProps = getDefaultParams();
+
+    const {getByTestId} = render(<ConversationDetails {...defaultProps} activeConversation={conversation} />);
+
+    expect(getByTestId('conversation-details-description')).toBeDefined();
+  });
+
+  it('does not render the channel description section for 1:1 conversations', () => {
+    const conversation = new Conversation();
+    conversation.type(CONVERSATION_TYPE.ONE_TO_ONE);
+    const otherUser = new User('other-user');
+    jest.spyOn(otherUser as any, 'isConnected').mockReturnValue(true);
+    conversation.participating_user_ets([otherUser]);
+
+    const defaultProps = getDefaultParams();
+
+    const {queryByTestId} = render(<ConversationDetails {...defaultProps} activeConversation={conversation} />);
+
+    expect(queryByTestId('conversation-details-description')).toBeNull();
+  });
+
   it("returns the right actions depending on the conversation's type for non group creators", () => {
     const conversation = new Conversation('', '', CONVERSATION_PROTOCOL.PROTEUS, translateForTest);
     const otherUser = new User('other-user', '', translateForTest);
diff --git a/apps/webapp/src/script/page/RightSidebar/conversationDetails/conversationDetails.tsx b/apps/webapp/src/script/page/RightSidebar/conversationDetails/conversationDetails.tsx
index ab9285eafae..02c0c090b2d 100644
--- a/apps/webapp/src/script/page/RightSidebar/conversationDetails/conversationDetails.tsx
+++ b/apps/webapp/src/script/page/RightSidebar/conversationDetails/conversationDetails.tsx
@@ -46,6 +46,7 @@ import {useKoSubscribableChildren} from 'Util/componentUtil';
 import {sortUsersByPriority} from 'Util/stringUtil';
 import {formatDuration} from 'Util/timeUtil';
 
+import {ConversationDetailsDescription} from './components/conversationDetailsDescription';
 import {ConversationDetailsHeader} from './components/conversationDetailsHeader';
 import {ConversationDetailsOptions} from './components/conversationDetailsOptions';
 import {ConversationDetailsParticipants} from './components/conversationDetailsParticipants';
@@ -113,6 +114,7 @@ const ConversationDetails = forwardRef<HTMLDivElement, ConversationDetailsProps>
       firstUserEntity: firstParticipant,
       isGroupOrChannel,
       cellsState,
+      description,
     } = useKoSubscribableChildren(activeConversation, [
       'isMutable',
       'showNotificationsNothing',
@@ -131,9 +133,11 @@ const ConversationDetails = forwardRef<HTMLDivElement, ConversationDetailsProps>
       'firstUserEntity',
       'isGroupOrChannel',
       'cellsState',
+      'description',
     ]);
 
     const {isTemporaryGuest} = useKoSubscribableChildren(firstParticipant!, ['isTemporaryGuest']);
+    const canEditDescription = roleRepository.isUserGroupAdmin(activeConversation, selfUser);
 
     const {isTeam, classifiedDomains, team, isSelfDeletingMessagesEnforced, getEnforcedSelfDeletingMessagesTimeout} =
       useKoSubscribableChildren(teamState, [
@@ -244,6 +248,9 @@ const ConversationDetails = forwardRef<HTMLDivElement, ConversationDetailsProps>
 
     const showAllParticipants = () => togglePanel(PanelState.CONVERSATION_PARTICIPANTS, activeConversation);
 
+    const updateConversationDescription = (newDescription: string) =>
+      conversationRepository.updateConversationDescription(activeConversation, newDescription);
+
     const updateConversationReceiptMode = (receiptMode: RECEIPT_MODE) =>
       conversationRepository.updateConversationReceiptMode(activeConversation, {receipt_mode: receiptMode});
 
@@ -327,6 +334,12 @@ const ConversationDetails = forwardRef<HTMLDivElement, ConversationDetailsProps>
                 conversation={activeConversation}
               />
 
+              <ConversationDetailsDescription
+                canEdit={canEditDescription}
+                description={description}
+                onDescriptionChange={updateConversationDescription}
+              />
+
               {showActionAddParticipants && (
                 <div className="conversation-details__participant-options">
                   <button
diff --git a/apps/webapp/src/script/repositories/conversation/ConversationRepository.ts b/apps/webapp/src/script/repositories/conversation/ConversationRepository.ts
index 6dd7dbed6ae..2d7b890e37b 100644
--- a/apps/webapp/src/script/repositories/conversation/ConversationRepository.ts
+++ b/apps/webapp/src/script/repositories/conversation/ConversationRepository.ts
@@ -150,6 +150,7 @@ import {
   ButtonActionEvent,
   ClientConversationEvent,
   DeleteEvent,
+  DescriptionUpdateEvent,
   EventBuilder,
   GroupCreationEvent,
   MemberLeaveEvent,
@@ -2947,6 +2948,104 @@ export class ConversationRepository {
     return undefined;
   }
 
+  /** Tracks the current description version per conversation for optimistic concurrency. */
+  private readonly descriptionVersions = new Map<string, number>();
+
+  /**
+   * Load encrypted conversation description from backend and decrypt it with the MLS group secret.
+   */
+  public async loadConversationDescription(conversationEntity: Conversation): Promise<void> {
+    if (!conversationEntity.groupId) {
+      this.logger.warn('Cannot load conversation description without MLS group ID', {
+        conversationId: conversationEntity.id,
+      });
+      return;
+    }
+
+    try {
+      const {version, description} = await this.conversationService.getConversationDescription(
+        conversationEntity.qualifiedId,
+        conversationEntity.groupId,
+      );
+      this.descriptionVersions.set(conversationEntity.id, version);
+      conversationEntity.description(description);
+    } catch (error) {
+      this.logger.warn('Failed to load conversation description', {conversationId: conversationEntity.id, error});
+    }
+  }
+
+  /**
+   * Encrypt and update conversation description through the backend API.
+   *
+   * @param conversationEntity Conversation to update
+   * @param description New description plaintext
+   */
+  public async updateConversationDescription(conversationEntity: Conversation, description: string): Promise<void> {
+    if (!conversationEntity.groupId) {
+      throw new Error('Cannot update conversation description without MLS group ID');
+    }
+
+    const baseVersion = this.descriptionVersions.get(conversationEntity.id) ?? 0;
+    const previousDescription = conversationEntity.description();
+    const action = previousDescription.length > 0 ? 'edit' : 'add';
+    const {version} = await this.conversationService.updateConversationDescription(
+      conversationEntity.qualifiedId,
+      conversationEntity.groupId,
+      description,
+      baseVersion,
+    );
+    this.descriptionVersions.set(conversationEntity.id, version);
+    conversationEntity.description(description);
+
+    await this.eventRepository.injectEvent(
+      EventBuilder.buildDescriptionUpdate(conversationEntity, description, action),
+      EventRepository.SOURCE.INJECTED,
+    );
+  }
+
+  private async onDescriptionUpdate(conversationEntity: Conversation, eventJson: IncomingEvent) {
+    const eventData = eventJson.data as {ciphertext?: string; description?: string; version?: number};
+
+    if (eventData.description !== undefined) {
+      return this.addEventToConversation(conversationEntity, eventJson);
+    }
+
+    if (!conversationEntity.groupId || !eventData.ciphertext) {
+      this.logger.warn('Cannot decrypt conversation description update event', {
+        conversationId: conversationEntity.id,
+        hasCiphertext: Boolean(eventData.ciphertext),
+        hasGroupId: Boolean(conversationEntity.groupId),
+      });
+      return {conversationEntity};
+    }
+
+    const previousDescription = conversationEntity.description();
+    const action = previousDescription.length > 0 ? 'edit' : 'add';
+    const description = await this.conversationService.decryptConversationDescriptionCiphertext(
+      eventData.ciphertext,
+      conversationEntity.groupId,
+    );
+
+    if (eventData.version !== undefined) {
+      this.descriptionVersions.set(conversationEntity.id, eventData.version);
+    }
+    conversationEntity.description(description);
+
+    const descriptionUpdateEvent: DescriptionUpdateEvent = {
+      conversation: eventJson.conversation,
+      data: {action, description},
+      from: eventJson.from,
+      id: ('id' in eventJson && eventJson.id) || createUuid(),
+      qualified_conversation: eventJson.qualified_conversation,
+      qualified_from: eventJson.qualified_from,
+      server_time: eventJson.server_time,
+      time: eventJson.time,
+      type: ClientEvent.CONVERSATION.DESCRIPTION_UPDATE,
+    };
+
+    return this.addEventToConversation(conversationEntity, descriptionUpdateEvent);
+  }
+
   private readonly inject1to1MigratedToMLS = async (conversation: Conversation) => {
     const currentTimestamp = this.serverTimeHandler.toServerTimestamp();
     const protocolUpdateEvent = EventBuilder.build1to1MigratedToMLS(conversation, currentTimestamp);
@@ -3755,6 +3854,9 @@ export class ConversationRepository {
 
       case CONVERSATION_EVENT.MESSAGE_TIMER_UPDATE:
       case ClientEvent.CONVERSATION.DELETE_EVERYWHERE:
+      case ClientEvent.CONVERSATION.DESCRIPTION_UPDATE:
+        return this.onDescriptionUpdate(conversationEntity, eventJson);
+
       case ClientEvent.CONVERSATION.FILE_TYPE_RESTRICTED:
       case ClientEvent.CONVERSATION.INCOMING_MESSAGE_TOO_BIG:
       case ClientEvent.CONVERSATION.KNOCK:
diff --git a/apps/webapp/src/script/repositories/conversation/ConversationService.test.ts b/apps/webapp/src/script/repositories/conversation/ConversationService.test.ts
index 1204c0d7d67..bed49511b11 100644
--- a/apps/webapp/src/script/repositories/conversation/ConversationService.test.ts
+++ b/apps/webapp/src/script/repositories/conversation/ConversationService.test.ts
@@ -29,6 +29,12 @@ import {MessageCategory} from '../../message/MessageCategory';
 import type {APIClient} from '../../service/apiClientSingleton';
 import type {Core} from '../../service/coreSingleton';
 import {ConversationService} from './ConversationService';
+import {decryptDescription, encryptDescription} from './descriptionCrypto';
+
+jest.mock('./descriptionCrypto', () => ({
+  decryptDescription: jest.fn(),
+  encryptDescription: jest.fn(),
+}));
 
 type EventServiceLike = Pick<EventService, 'loadEventsWithCategory'>;
 
@@ -101,6 +107,54 @@ describe('ConversationService', () => {
     });
   });
 
+  describe('conversation description', () => {
+    const conversationId: QualifiedId = {id: 'conv-id', domain: 'wire.com'};
+    const groupId = 'group-id';
+    const secret = btoa('12345678901234567890123456789012');
+
+    const makeService = (conversationApi: Record<string, jest.Mock>) => {
+      const apiClient = {
+        api: {conversation: conversationApi},
+      } as unknown as APIClient;
+      const core = {
+        service: {mls: {exportSecretKey: jest.fn().mockResolvedValue(secret)}},
+      } as unknown as Core;
+
+      return {service: new ConversationService({} as EventService, {} as StorageService, apiClient, core), core};
+    };
+
+    it('fetches and decrypts the encrypted conversation description', async () => {
+      const getConversationDescription = jest.fn().mockResolvedValue({version: 7, ciphertext: 'ciphertext'});
+      const {service, core} = makeService({getConversationDescription});
+      jest.mocked(decryptDescription).mockResolvedValueOnce('decrypted description');
+
+      const result = await service.getConversationDescription(conversationId, groupId);
+
+      expect(result).toEqual({version: 7, description: 'decrypted description'});
+      expect(getConversationDescription).toHaveBeenCalledWith(conversationId);
+      expect(core.service?.mls?.exportSecretKey).toHaveBeenCalledWith(groupId, 32);
+      expect(decryptDescription).toHaveBeenCalledWith('ciphertext', expect.any(Uint8Array));
+    });
+
+    it('fetches current version before updating the encrypted conversation description', async () => {
+      const getConversationDescription = jest.fn().mockResolvedValue({version: 7, ciphertext: 'current-ciphertext'});
+      const putConversationDescription = jest.fn().mockResolvedValue(undefined);
+      const {service, core} = makeService({getConversationDescription, putConversationDescription});
+      jest.mocked(encryptDescription).mockResolvedValueOnce('new-ciphertext');
+
+      const result = await service.updateConversationDescription(conversationId, groupId, 'new description', 3);
+
+      expect(result).toEqual({version: 8});
+      expect(getConversationDescription).toHaveBeenCalledWith(conversationId);
+      expect(core.service?.mls?.exportSecretKey).toHaveBeenCalledWith(groupId, 32);
+      expect(encryptDescription).toHaveBeenCalledWith('new description', expect.any(Uint8Array));
+      expect(putConversationDescription).toHaveBeenCalledWith(conversationId, {
+        base_version: 7,
+        ciphertext: 'new-ciphertext',
+      });
+    });
+  });
+
   describe('getSafeConversationById', () => {
     const conversationId: QualifiedId = {id: 'conv-id', domain: 'wire.com'};
 
diff --git a/apps/webapp/src/script/repositories/conversation/ConversationService.ts b/apps/webapp/src/script/repositories/conversation/ConversationService.ts
index 9a446dd3515..3c0d1527d68 100644
--- a/apps/webapp/src/script/repositories/conversation/ConversationService.ts
+++ b/apps/webapp/src/script/repositories/conversation/ConversationService.ts
@@ -58,6 +58,7 @@ import {StorageSchemata} from 'Repositories/storage/storageSchemata';
 import {getLogger} from 'Util/logger';
 
 import {MLSCapableConversation} from './ConversationSelectors';
+import {decryptDescription, encryptDescription} from './descriptionCrypto';
 
 import {MessageCategory} from '../../message/MessageCategory';
 import {APIClient} from '../../service/apiClientSingleton';
@@ -191,6 +192,73 @@ export class ConversationService {
     });
   }
 
+  private get mlsService() {
+    const mlsService = this.core.service?.mls;
+
+    if (!mlsService) {
+      throw new Error('MLS service not available');
+    }
+
+    return mlsService;
+  }
+
+  private async getDescriptionSecret(groupId: string): Promise<Uint8Array> {
+    const secret = await this.mlsService.exportSecretKey(groupId, 32);
+    return Uint8Array.from(atob(secret), char => char.charCodeAt(0));
+  }
+
+  /**
+   * Get and decrypt the encrypted conversation description.
+   *
+   * @param conversationId ID of the conversation
+   * @param groupId MLS group ID used to derive the description encryption key
+   * @returns The description plaintext and version
+   */
+  async getConversationDescription(conversationId: QualifiedId, groupId: string): Promise<{version: number; description: string}> {
+    const {version, ciphertext} = await this.apiClient.api.conversation.getConversationDescription(conversationId);
+
+    if (!ciphertext) {
+      return {version, description: ''};
+    }
+
+    const secret = await this.getDescriptionSecret(groupId);
+    const description = await decryptDescription(ciphertext, secret);
+
+    return {version, description};
+  }
+
+  async decryptConversationDescriptionCiphertext(ciphertext: string, groupId: string): Promise<string> {
+    const secret = await this.getDescriptionSecret(groupId);
+    return decryptDescription(ciphertext, secret);
+  }
+
+  /**
+   * Encrypt and update the conversation description.
+   *
+   * @param conversationId ID of the conversation
+   * @param groupId MLS group ID used to derive the description encryption key
+   * @param description new description plaintext
+   * @param baseVersion current version for optimistic concurrency
+   * @returns The new version number
+   */
+  async updateConversationDescription(
+    conversationId: QualifiedId,
+    groupId: string,
+    description: string,
+    baseVersion: number,
+  ): Promise<{version: number}> {
+    const currentDescription = await this.apiClient.api.conversation.getConversationDescription(conversationId);
+    const secret = await this.getDescriptionSecret(groupId);
+    const ciphertext = await encryptDescription(description, secret);
+
+    await this.apiClient.api.conversation.putConversationDescription(conversationId, {
+      base_version: currentDescription.version,
+      ciphertext,
+    });
+
+    return {version: currentDescription.version + 1};
+  }
+
   /**
    * Update the conversation protocol.
    *
diff --git a/apps/webapp/src/script/repositories/conversation/EventBuilder/EventBuilder.ts b/apps/webapp/src/script/repositories/conversation/EventBuilder/EventBuilder.ts
index b677043f17c..25942ae0dea 100644
--- a/apps/webapp/src/script/repositories/conversation/EventBuilder/EventBuilder.ts
+++ b/apps/webapp/src/script/repositories/conversation/EventBuilder/EventBuilder.ts
@@ -104,6 +104,11 @@ export type DeleteEvent = ConversationEvent<
   CONVERSATION.MESSAGE_DELETE,
   {deleted_time: number; message_id: string; time: string}
 >;
+export type DescriptionUpdateAction = 'add' | 'edit';
+export type DescriptionUpdateEvent = ConversationEvent<
+  CONVERSATION.DESCRIPTION_UPDATE,
+  {action: DescriptionUpdateAction; description: string}
+>;
 export type FederationStopEvent = ConversationEvent<CONVERSATION.FEDERATION_STOP, {domains: string[]}>;
 export type GroupCreationEventData = {
   allTeamMembers: boolean;
@@ -274,6 +279,7 @@ export type ClientConversationEvent =
   | ConfirmationEvent
   | FederationStopEvent
   | DeleteEvent
+  | DescriptionUpdateEvent
   | DeleteEverywhereEvent
   | DegradedMessageEvent
   | ButtonActionConfirmationEvent
@@ -385,6 +391,23 @@ export const EventBuilder = {
     };
   },
 
+  buildDescriptionUpdate(
+    conversationEntity: Conversation,
+    description: string,
+    action: DescriptionUpdateAction,
+  ): DescriptionUpdateEvent {
+    const selfUser = getConversationSelfUser(conversationEntity);
+
+    return {
+      ...buildQualifiedId(conversationEntity),
+      data: {action, description},
+      from: selfUser.id,
+      id: createUuid(),
+      time: conversationEntity.getNextIsoDate(),
+      type: ClientEvent.CONVERSATION.DESCRIPTION_UPDATE,
+    };
+  },
+
   buildE2EIDegraded(
     conversationEntity: Conversation,
     type: E2EIVerificationMessageType,
diff --git a/apps/webapp/src/script/repositories/conversation/EventMapper.ts b/apps/webapp/src/script/repositories/conversation/EventMapper.ts
index d035a184fff..dcf8a60455c 100644
--- a/apps/webapp/src/script/repositories/conversation/EventMapper.ts
+++ b/apps/webapp/src/script/repositories/conversation/EventMapper.ts
@@ -34,6 +34,7 @@ import {CompositeMessage} from 'Repositories/entity/message/CompositeMessage';
 import {ContentMessage} from 'Repositories/entity/message/ContentMessage';
 import {DecryptErrorMessage} from 'Repositories/entity/message/DecryptErrorMessage';
 import {DeleteMessage} from 'Repositories/entity/message/DeleteMessage';
+import {DescriptionUpdateMessage} from 'Repositories/entity/message/DescriptionUpdateMessage';
 import {E2EIVerificationMessage} from 'Repositories/entity/message/E2EIVerificationMessage';
 import {FailedToAddUsersMessage} from 'Repositories/entity/message/FailedToAddUsersMessage';
 import {FederationStopMessage} from 'Repositories/entity/message/FederationStopMessage';
@@ -302,6 +303,11 @@ export class EventMapper {
         break;
       }
 
+      case ClientEvent.CONVERSATION.DESCRIPTION_UPDATE: {
+        messageEntity = this._mapEventDescriptionUpdate(event);
+        break;
+      }
+
       case ClientEvent.CONVERSATION.ASSET_ADD: {
         messageEntity = addMetadata(this._mapEventAssetAdd(event), event);
         break;
@@ -807,6 +813,13 @@ export class EventMapper {
     return new RenameMessage(eventData.name, from, qualified_from?.domain, this.translate);
   }
 
+  /**
+   * Maps JSON data of conversation.description-update message into message entity.
+   */
+  private _mapEventDescriptionUpdate({data: eventData}: LegacyEventRecord) {
+    return new DescriptionUpdateMessage(eventData.description, eventData.action, this.translate);
+  }
+
   /**
    * Maps JSON data of conversation.receipt-mode-update message into message entity.
    *
diff --git a/apps/webapp/src/script/repositories/conversation/descriptionCrypto.test.ts b/apps/webapp/src/script/repositories/conversation/descriptionCrypto.test.ts
new file mode 100644
index 00000000000..9273dd6456f
--- /dev/null
+++ b/apps/webapp/src/script/repositories/conversation/descriptionCrypto.test.ts
@@ -0,0 +1,89 @@
+/*
+ * Wire
+ * Copyright (C) 2026 Wire Swiss GmbH
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see http://www.gnu.org/licenses/.
+ *
+ */
+
+import {encryptDescription, decryptDescription} from './descriptionCrypto';
+
+describe('descriptionCrypto', () => {
+  const generateTestKey = async (): Promise<Uint8Array> => {
+    const key = new Uint8Array(32);
+    crypto.getRandomValues(key);
+    return key;
+  };
+
+  it('encrypts and decrypts a description round-trip', async () => {
+    const secret = await generateTestKey();
+    const plaintext = 'Team channel for discussions';
+
+    const ciphertextBase64 = await encryptDescription(plaintext, secret);
+    const decrypted = await decryptDescription(ciphertextBase64, secret);
+
+    expect(decrypted).toBe(plaintext);
+  });
+
+  it('produces different ciphertext for same plaintext (random IV)', async () => {
+    const secret = await generateTestKey();
+    const plaintext = 'Same text';
+
+    const a = await encryptDescription(plaintext, secret);
+    const b = await encryptDescription(plaintext, secret);
+
+    expect(a).not.toBe(b);
+  });
+
+  it('fails to decrypt with wrong key', async () => {
+    const secret1 = await generateTestKey();
+    const secret2 = await generateTestKey();
+    const plaintext = 'Secret text';
+
+    const ciphertextBase64 = await encryptDescription(plaintext, secret1);
+
+    await expect(decryptDescription(ciphertextBase64, secret2)).rejects.toThrow();
+  });
+
+  it('handles empty string', async () => {
+    const secret = await generateTestKey();
+
+    const ciphertextBase64 = await encryptDescription('', secret);
+    const decrypted = await decryptDescription(ciphertextBase64, secret);
+
+    expect(decrypted).toBe('');
+  });
+
+  it('handles unicode text', async () => {
+    const secret = await generateTestKey();
+    const plaintext = '日本語テスト 🎉 émojis';
+
+    const ciphertextBase64 = await encryptDescription(plaintext, secret);
+    const decrypted = await decryptDescription(ciphertextBase64, secret);
+
+    expect(decrypted).toBe(plaintext);
+  });
+
+  it('produces base64 AES-CBC output with a random encrypted prefix block', async () => {
+    const secret = await generateTestKey();
+    const ciphertextBase64 = await encryptDescription('test', secret);
+
+    // Should be valid base64
+    const raw = Uint8Array.from(atob(ciphertextBase64), c => c.charCodeAt(0));
+
+    // AES-CBC ciphertext is block-aligned and includes one random prefix block
+    expect(raw.length).toBeGreaterThanOrEqual(32);
+    expect(raw.length % 16).toBe(0);
+  });
+});
diff --git a/apps/webapp/src/script/repositories/conversation/descriptionCrypto.ts b/apps/webapp/src/script/repositories/conversation/descriptionCrypto.ts
new file mode 100644
index 00000000000..0df3148b9a1
--- /dev/null
+++ b/apps/webapp/src/script/repositories/conversation/descriptionCrypto.ts
@@ -0,0 +1,79 @@
+/*
+ * Wire
+ * Copyright (C) 2026 Wire Swiss GmbH
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see http://www.gnu.org/licenses/.
+ *
+ */
+
+/**
+ * AES-CBC encryption/decryption for conversation description metadata.
+ *
+ * Wire format matches iOS `zmEncryptPrefixingIV` / `zmDecryptPrefixedIV`:
+ *   AES-256-CBC with PKCS#7 padding and a zero IV.
+ *   Plaintext is prefixed with one random AES block before encryption.
+ *   Decryption decrypts the full payload and drops the first plaintext block.
+ *
+ * Despite the iOS method name, the IV is not stored in the payload; randomization
+ * comes from encrypting the random first block in CBC mode.
+ *
+ * Key: 32-byte secret derived from MLS epoch via exportSecretKey(groupId, 32).
+ */
+
+const BLOCK_LENGTH = 16;
+const ALGORITHM = 'AES-CBC';
+const ZERO_IV = new Uint8Array(BLOCK_LENGTH);
+
+async function importKey(rawKey: Uint8Array): Promise<CryptoKey> {
+  const keyData = new Uint8Array(rawKey).buffer as ArrayBuffer;
+  return crypto.subtle.importKey('raw', keyData, ALGORITHM, false, ['encrypt', 'decrypt']);
+}
+
+/**
+ * Encrypt a UTF-8 description string.
+ *
+ * @param plaintext - The description text
+ * @param secret - 32-byte MLS-derived secret
+ * @returns Base64-encoded AES-CBC blob compatible with iOS zmEncryptPrefixingIV
+ */
+export async function encryptDescription(plaintext: string, secret: Uint8Array): Promise<string> {
+  const key = await importKey(secret);
+  const randomPrefix = crypto.getRandomValues(new Uint8Array(BLOCK_LENGTH));
+  const encoded = new TextEncoder().encode(plaintext);
+
+  const prefixedPlaintext = new Uint8Array(BLOCK_LENGTH + encoded.length);
+  prefixedPlaintext.set(randomPrefix, 0);
+  prefixedPlaintext.set(encoded, BLOCK_LENGTH);
+
+  const ciphertext = await crypto.subtle.encrypt({name: ALGORITHM, iv: ZERO_IV}, key, prefixedPlaintext);
+
+  return btoa(String.fromCharCode(...new Uint8Array(ciphertext)));
+}
+
+/**
+ * Decrypt a base64-encoded description blob.
+ *
+ * @param ciphertextBase64 - Base64-encoded AES-CBC blob
+ * @param secret - 32-byte MLS-derived secret (same epoch as encryption)
+ * @returns The decrypted plaintext string
+ */
+export async function decryptDescription(ciphertextBase64: string, secret: Uint8Array): Promise<string> {
+  const key = await importKey(secret);
+  const ciphertext = Uint8Array.from(atob(ciphertextBase64), c => c.charCodeAt(0));
+
+  const decrypted = await crypto.subtle.decrypt({name: ALGORITHM, iv: ZERO_IV}, key, ciphertext);
+  const plaintext = new Uint8Array(decrypted).slice(BLOCK_LENGTH);
+
+  return new TextDecoder().decode(plaintext);
+}
diff --git a/apps/webapp/src/script/repositories/entity/Conversation.ts b/apps/webapp/src/script/repositories/entity/Conversation.ts
index 50b5b977cc2..b59fbb8e3cb 100644
--- a/apps/webapp/src/script/repositories/entity/Conversation.ts
+++ b/apps/webapp/src/script/repositories/entity/Conversation.ts
@@ -165,6 +165,7 @@ export class Conversation {
   public readonly initialMessage: ko.Observable<Message | undefined>;
   public readonly messageTimer: ko.PureComputed<number>;
   public readonly name: ko.Observable<string>;
+  public readonly description: ko.Observable<string>;
   public readonly notificationState: ko.PureComputed<number>;
   public readonly participating_user_ets: ko.ObservableArray<User>;
   public readonly participating_user_ids: ko.ObservableArray<QualifiedId>;
@@ -220,6 +221,7 @@ export class Conversation {
     this.accessCodeHasPassword = ko.observable();
     this.creator = '';
     this.name = ko.observable('');
+    this.description = ko.observable('');
     this.teamId = '';
     this.type = ko.observable(CONVERSATION_TYPE.REGULAR);
     this.groupConversationType = ko.observable<GROUP_CONVERSATION_TYPE>(GROUP_CONVERSATION_TYPE.GROUP_CONVERSATION);
diff --git a/apps/webapp/src/script/repositories/entity/message/DescriptionUpdateMessage.ts b/apps/webapp/src/script/repositories/entity/message/DescriptionUpdateMessage.ts
new file mode 100644
index 00000000000..bee408d2852
--- /dev/null
+++ b/apps/webapp/src/script/repositories/entity/message/DescriptionUpdateMessage.ts
@@ -0,0 +1,42 @@
+/*
+ * Wire
+ * Copyright (C) 2026 Wire Swiss GmbH
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see http://www.gnu.org/licenses/.
+ *
+ */
+
+import {ClientEvent} from 'Repositories/event/Client';
+import {type Translate} from 'Util/localizerUtil';
+
+import {SystemMessage} from './SystemMessage';
+
+import {SystemMessageType} from '../../../message/SystemMessageType';
+
+export type DescriptionUpdateAction = 'add' | 'edit';
+
+export class DescriptionUpdateMessage extends SystemMessage {
+  public readonly description: string;
+  public readonly action: DescriptionUpdateAction;
+
+  constructor(description: string, action: DescriptionUpdateAction = 'edit', translate: Translate) {
+    super(translate);
+
+    this.type = ClientEvent.CONVERSATION.DESCRIPTION_UPDATE;
+    this.system_message_type = SystemMessageType.CONVERSATION_DESCRIPTION_UPDATE;
+    this.description = description;
+    this.action = action;
+    this.caption = translate(action === 'add' ? 'conversationDescriptionAddedYou' : 'conversationDescriptionEditedYou');
+  }
+}
diff --git a/apps/webapp/src/script/repositories/event/Client.ts b/apps/webapp/src/script/repositories/event/Client.ts
index ec016033827..895930a8eb1 100644
--- a/apps/webapp/src/script/repositories/event/Client.ts
+++ b/apps/webapp/src/script/repositories/event/Client.ts
@@ -32,6 +32,7 @@ export enum CONVERSATION {
   COMPOSITE_MESSAGE_ADD = 'conversation.composite-message-add',
   CONFIRMATION = 'conversation.confirmation',
   DELETE_EVERYWHERE = 'conversation.delete-everywhere',
+  DESCRIPTION_UPDATE = 'conversation.description-update',
   FILE_TYPE_RESTRICTED = 'conversation.file-type-restricted',
   GROUP_CREATION = 'conversation.group-creation',
   INCOMING_MESSAGE_TOO_BIG = 'conversation.incoming-message-too-big',
diff --git a/apps/webapp/src/style/content/conversation/message-list.less b/apps/webapp/src/style/content/conversation/message-list.less
index 9969058fb3a..d39de3f9d30 100644
--- a/apps/webapp/src/style/content/conversation/message-list.less
+++ b/apps/webapp/src/style/content/conversation/message-list.less
@@ -185,6 +185,11 @@
   &--svg {
     line-height: 0;
 
+    &.message-header-icon--top {
+      align-self: flex-start;
+      margin-top: 2px;
+    }
+
     svg:not(.filled) path {
       fill: var(--foreground);
     }
@@ -223,6 +228,38 @@
     flex: 1;
   }
 
+  &--description {
+    display: block;
+    color: var(--background);
+
+    > span {
+      display: block;
+    }
+
+    .md-heading {
+      margin: 4px 0 8px;
+      font-size: var(--font-size-base);
+      font-weight: var(--font-weight-bold);
+      line-height: var(--line-height-lg);
+
+      &--1 {
+        font-size: var(--font-size-xlarge);
+      }
+
+      &--2 {
+        font-size: var(--font-size-large);
+      }
+
+      &--3 {
+        font-size: var(--font-size-base);
+      }
+
+      & + br {
+        display: none;
+      }
+    }
+  }
+
   a {
     cursor: pointer;
   }
diff --git a/apps/webapp/src/style/modal/group-creation.less b/apps/webapp/src/style/modal/group-creation.less
index ef11a8d2064..3286f7c722b 100644
--- a/apps/webapp/src/style/modal/group-creation.less
+++ b/apps/webapp/src/style/modal/group-creation.less
@@ -23,6 +23,50 @@
       min-height: 4rem;
     }
 
+    .modal-input-wrapper:focus-within .group-creation__description-label {
+      color: var(--accent-color-500);
+    }
+
+    .group-creation__description-label {
+      display: block;
+      margin-bottom: 2px;
+      color: var(--text-input-color);
+      font-weight: var(--font-weight-semibold);
+    }
+
+    .group-creation__description-input {
+      width: 100%;
+      min-height: 96px;
+      margin-right: 0;
+      margin-left: 0;
+      padding: 12px 16px;
+      box-sizing: border-box;
+      border: 1px solid var(--text-input-border);
+      border-radius: 12px;
+      background: var(--text-input-background);
+      color: var(--text-input-color);
+      font-size: var(--font-size-base);
+      font-weight: var(--font-weight-regular);
+      line-height: var(--line-height-lg);
+      outline: none;
+      resize: vertical;
+
+      &::placeholder {
+        color: var(--text-input-placeholder);
+        opacity: 1;
+      }
+
+      &:hover {
+        border-color: var(--text-input-border-hover);
+      }
+
+      &:focus,
+      &:focus-visible,
+      &:active {
+        border-color: var(--accent-color-500);
+      }
+    }
+
     .modal__content {
       height: 490px;
     }
@@ -32,7 +76,10 @@
     }
 
     .modal__info {
-      margin: 8px 4px 22px;
+      margin: 0 2px 16px;
+      color: var(--gray-90);
+      font-size: var(--font-size-small);
+      line-height: var(--line-height-xs);
     }
 
     .modal__select-description {
diff --git a/apps/webapp/src/style/panel/conversation-details.less b/apps/webapp/src/style/panel/conversation-details.less
index 156d736ee53..71657d393ab 100644
--- a/apps/webapp/src/style/panel/conversation-details.less
+++ b/apps/webapp/src/style/panel/conversation-details.less
@@ -124,6 +124,172 @@
     }
   }
 
+  &__description {
+    padding: 0 20px;
+    margin-top: 16px;
+    margin-bottom: 8px;
+
+    &-label {
+      display: flex;
+      align-items: center;
+      gap: 6px;
+    }
+
+    &-heading {
+      margin: 0;
+      color: var(--background);
+      font-size: var(--font-size-small);
+      font-weight: 600;
+      line-height: var(--line-height-md);
+    }
+
+    &-edit-button {
+      display: flex;
+      padding: 2px;
+      border: none;
+      background: transparent;
+      cursor: pointer;
+    }
+
+    &-edit-icon {
+      width: 12px;
+      height: 12px;
+
+      path {
+        fill: var(--foreground-fade-56);
+      }
+    }
+
+    &-content {
+      display: block;
+      width: 100%;
+      padding: 0;
+      border: none;
+      background: transparent;
+      cursor: pointer;
+      text-align: left;
+    }
+
+    &-text {
+      margin: 4px 0 0;
+      color: var(--background);
+      font-size: var(--font-size-small);
+      line-height: var(--line-height-md);
+      word-break: break-word;
+
+      li {
+        display: list-item;
+        line-height: var(--line-height-lg);
+
+        &::after {
+          display: none;
+        }
+      }
+
+      li::marker {
+        color: currentColor;
+      }
+
+      && ul,
+      && ol {
+        padding-left: 24px;
+        margin-top: 0;
+        margin-bottom: 0;
+        line-height: 0.85;
+        list-style-position: outside;
+      }
+
+      && ul {
+        list-style-type: disc;
+      }
+
+      && ol {
+        list-style-type: decimal;
+      }
+
+      ol ol {
+        list-style: lower-alpha;
+      }
+
+      ol ol ol {
+        list-style: lower-roman;
+      }
+
+      a:hover {
+        text-decoration: underline;
+      }
+
+      .md-heading {
+        margin: 4px 0 8px;
+        font-size: var(--font-size-base);
+        font-weight: var(--font-weight-bold);
+        line-height: var(--line-height-lg);
+
+        &--1 {
+          font-size: var(--font-size-xlarge);
+        }
+
+        &--2 {
+          font-size: var(--font-size-large);
+        }
+
+        &--3 {
+          font-size: var(--font-size-base);
+        }
+
+        & + br {
+          display: none;
+        }
+      }
+
+      .md-blockquote {
+        position: relative;
+        padding: 0 12px 0 16px;
+        margin: 0;
+
+        &::before {
+          position: absolute;
+          top: 0;
+          left: 0;
+          width: 4px;
+          height: 100%;
+          border-radius: 2px;
+          margin-right: 12px;
+          background-color: var(--message-quote-bg);
+          content: '';
+        }
+      }
+    }
+
+    &-placeholder {
+      margin: 4px 0 0;
+      color: var(--foreground-fade-40);
+      font-size: var(--font-size-small);
+      font-style: italic;
+      line-height: var(--line-height-md);
+    }
+
+    &-input {
+      width: 100%;
+      min-height: 64px;
+      padding: 8px;
+      border: 1px solid var(--gray-60);
+      border-radius: 8px;
+      margin-top: 4px;
+      background-color: var(--app-bg);
+      color: var(--background);
+      font-family: inherit;
+      font-size: var(--font-size-small);
+      line-height: var(--line-height-md);
+      outline: none;
+      resize: vertical;
+
+      &:focus {
+        border-color: var(--accent-color);
+      }
+    }
+  }
+
   &__list-head {
     .panel-header;
     width: 100%;
diff --git a/apps/webapp/test/e2e_tests/pageManager/webapp/pages/conversationDetails.page.ts b/apps/webapp/test/e2e_tests/pageManager/webapp/pages/conversationDetails.page.ts
index 13280a4686b..c25e9f20b6d 100644
--- a/apps/webapp/test/e2e_tests/pageManager/webapp/pages/conversationDetails.page.ts
+++ b/apps/webapp/test/e2e_tests/pageManager/webapp/pages/conversationDetails.page.ts
@@ -44,6 +44,12 @@ export class ConversationDetailsPage {
   readonly editConversationNameButton: Locator;
   readonly textFieldForConversationName: Locator;
 
+  readonly descriptionSection: Locator;
+  readonly descriptionContent: Locator;
+  readonly descriptionTextarea: Locator;
+  readonly descriptionEditIcon: Locator;
+  readonly descriptionHeading: Locator;
+
   readonly protocol: Locator;
 
   constructor(page: Page) {
@@ -68,6 +74,12 @@ export class ConversationDetailsPage {
     this.editConversationNameButton = this.page.getByRole('button', {name: 'Change conversation name'});
     this.textFieldForConversationName = this.page.locator('textarea[data-uie-name="enter-name"]');
 
+    this.descriptionSection = this.conversationDetails.locator('[data-uie-name="conversation-details-description"]');
+    this.descriptionContent = this.conversationDetails.locator('[data-uie-name="description-content"]');
+    this.descriptionTextarea = this.conversationDetails.locator('[data-uie-name="description-textarea"]');
+    this.descriptionEditIcon = this.conversationDetails.locator('[data-uie-name="description-edit-icon"]');
+    this.descriptionHeading = this.descriptionSection.locator('.conversation-details__description-heading');
+
     this.protocol = this.conversationDetails.getByLabel('Protocol');
   }
 
@@ -245,4 +257,21 @@ export class ConversationDetailsPage {
     await this.textFieldForConversationName.fill(newConversationName);
     await this.textFieldForConversationName.press('Enter');
   }
+
+  async setDescription(description: string) {
+    await this.descriptionContent.click();
+    await this.descriptionTextarea.fill(description);
+    await this.descriptionTextarea.press('Enter');
+  }
+
+  async clearDescription() {
+    await this.descriptionContent.click();
+    await this.descriptionTextarea.fill('');
+    await this.descriptionTextarea.press('Enter');
+  }
+
+  async cancelDescriptionEdit() {
+    await this.descriptionContent.click();
+    await this.descriptionTextarea.press('Escape');
+  }
 }
diff --git a/apps/webapp/test/e2e_tests/specs/ConversationDescription/conversationDescription.spec.ts b/apps/webapp/test/e2e_tests/specs/ConversationDescription/conversationDescription.spec.ts
new file mode 100644
index 00000000000..cb8bd85cc2d
--- /dev/null
+++ b/apps/webapp/test/e2e_tests/specs/ConversationDescription/conversationDescription.spec.ts
@@ -0,0 +1,202 @@
+/*
+ * Wire
+ * Copyright (C) 2026 Wire Swiss GmbH
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see http://www.gnu.org/licenses/.
+ *
+ */
+
+import {User} from 'test/e2e_tests/data/user';
+import {PageManager} from 'test/e2e_tests/pageManager';
+import {test, expect, withLogin, Team} from 'test/e2e_tests/test.fixtures';
+import {createGroup} from 'test/e2e_tests/utils/userActions';
+
+test.describe('Conversation Description', () => {
+  let team: Team;
+  let userA: User;
+  let userB: User;
+  const groupName = 'Description Test Group';
+
+  test.beforeEach(async ({createTeam, createUser}) => {
+    userB = await createUser();
+    team = await createTeam('Desc Team', {users: [userB]});
+    userA = team.owner;
+  });
+
+  const openConversationDetails = async (pages: PageManager['webapp']['pages']) => {
+    await pages.conversationList().getConversation(groupName).open();
+    await pages.conversation().clickConversationInfoButton();
+    await pages.conversationDetails().waitForSidebar();
+  };
+
+  test(
+    'I want to see the description section with a placeholder in a new group conversation',
+    {tag: ['@regression']},
+    async ({createPage}) => {
+      const userAPages = await PageManager.from(createPage(withLogin(userA))).then(pm => pm.webapp.pages);
+
+      await createGroup(userAPages, groupName, [userB]);
+      await openConversationDetails(userAPages);
+
+      const details = userAPages.conversationDetails();
+
+      await expect(details.descriptionSection).toBeVisible();
+      await expect(details.descriptionHeading).toBeVisible();
+      await expect(details.descriptionContent).toContainText('Enter a description');
+    },
+  );
+
+  test(
+    'I want to set a description for a group conversation',
+    {tag: ['@regression']},
+    async ({createPage}) => {
+      const userAPages = await PageManager.from(createPage(withLogin(userA))).then(pm => pm.webapp.pages);
+      const description = 'This is a test description for the group';
+
+      await createGroup(userAPages, groupName, [userB]);
+      await openConversationDetails(userAPages);
+
+      const details = userAPages.conversationDetails();
+
+      await details.setDescription(description);
+
+      await expect(details.descriptionContent).toContainText(description);
+      await expect(details.descriptionTextarea).not.toBeVisible();
+    },
+  );
+
+  test(
+    'I want to edit an existing description',
+    {tag: ['@regression']},
+    async ({createPage}) => {
+      const userAPages = await PageManager.from(createPage(withLogin(userA))).then(pm => pm.webapp.pages);
+      const originalDescription = 'Original description';
+      const updatedDescription = 'Updated description';
+
+      await createGroup(userAPages, groupName, [userB]);
+      await openConversationDetails(userAPages);
+
+      const details = userAPages.conversationDetails();
+
+      // Set initial description
+      await details.setDescription(originalDescription);
+      await expect(details.descriptionContent).toContainText(originalDescription);
+
+      // Edit the description
+      await details.setDescription(updatedDescription);
+      await expect(details.descriptionContent).toContainText(updatedDescription);
+    },
+  );
+
+  test(
+    'I want to cancel editing a description with Escape',
+    {tag: ['@regression']},
+    async ({createPage}) => {
+      const userAPages = await PageManager.from(createPage(withLogin(userA))).then(pm => pm.webapp.pages);
+      const description = 'Should not change';
+
+      await createGroup(userAPages, groupName, [userB]);
+      await openConversationDetails(userAPages);
+
+      const details = userAPages.conversationDetails();
+
+      // Set initial description
+      await details.setDescription(description);
+
+      // Start editing, type something, then cancel
+      await details.descriptionContent.click();
+      await details.descriptionTextarea.fill('This will be discarded');
+      await details.descriptionTextarea.press('Escape');
+
+      // Verify original description is preserved
+      await expect(details.descriptionTextarea).not.toBeVisible();
+      await expect(details.descriptionContent).toContainText(description);
+    },
+  );
+
+  test(
+    'I want the description to persist after reopening conversation details',
+    {tag: ['@regression']},
+    async ({createPage}) => {
+      const userAPages = await PageManager.from(createPage(withLogin(userA))).then(pm => pm.webapp.pages);
+      const description = 'Persistent description';
+
+      await createGroup(userAPages, groupName, [userB]);
+      await openConversationDetails(userAPages);
+
+      const details = userAPages.conversationDetails();
+
+      // Set description
+      await details.setDescription(description);
+      await expect(details.descriptionContent).toContainText(description);
+
+      // Close and reopen the panel
+      await userAPages.conversation().clickConversationInfoButton();
+      await userAPages.conversation().clickConversationInfoButton();
+      await details.waitForSidebar();
+
+      // Verify description persists
+      await expect(details.descriptionContent).toContainText(description);
+    },
+  );
+
+  test(
+    'I want to see the edit icon when hovering over the description',
+    {tag: ['@regression']},
+    async ({createPage}) => {
+      const userAPages = await PageManager.from(createPage(withLogin(userA))).then(pm => pm.webapp.pages);
+      const description = 'Hover test description';
+
+      await createGroup(userAPages, groupName, [userB]);
+      await openConversationDetails(userAPages);
+
+      const details = userAPages.conversationDetails();
+
+      await details.setDescription(description);
+
+      // Edit icon should not be visible before hover
+      await expect(details.descriptionEditIcon).not.toBeVisible();
+
+      // Hover over the description section
+      await details.descriptionSection.hover();
+
+      // Edit icon should appear
+      await expect(details.descriptionEditIcon).toBeVisible();
+    },
+  );
+
+  test(
+    'I want to enter edit mode by clicking the edit icon',
+    {tag: ['@regression']},
+    async ({createPage}) => {
+      const userAPages = await PageManager.from(createPage(withLogin(userA))).then(pm => pm.webapp.pages);
+      const description = 'Edit icon test';
+
+      await createGroup(userAPages, groupName, [userB]);
+      await openConversationDetails(userAPages);
+
+      const details = userAPages.conversationDetails();
+
+      await details.setDescription(description);
+
+      // Hover and click edit icon
+      await details.descriptionSection.hover();
+      await details.descriptionEditIcon.click();
+
+      // Textarea should appear with current description
+      await expect(details.descriptionTextarea).toBeVisible();
+      await expect(details.descriptionTextarea).toHaveValue(description);
+    },
+  );
+});
diff --git a/libraries/api-client/src/conversation/conversationApi/conversationApi.test.ts b/libraries/api-client/src/conversation/conversationApi/conversationApi.test.ts
index 47fdba1e27d..7e409e68a50 100644
--- a/libraries/api-client/src/conversation/conversationApi/conversationApi.test.ts
+++ b/libraries/api-client/src/conversation/conversationApi/conversationApi.test.ts
@@ -58,6 +58,41 @@ const conversationApi = new ConversationAPI(client, {
 const generateQualifiedId = () => ({domain, id: randomUUID()});
 
 describe('ConversationAPI', () => {
+  beforeEach(() => {
+    jest.clearAllMocks();
+  });
+
+  describe('getConversationDescription', () => {
+    it('gets the encrypted conversation description', async () => {
+      const conversationId = generateQualifiedId();
+      const description = {version: 1, ciphertext: 'encrypted-description'};
+      jest.spyOn(client, 'sendJSON').mockResolvedValueOnce({data: description} as AxiosResponse);
+
+      const result = await conversationApi.getConversationDescription(conversationId);
+
+      expect(result).toBe(description);
+      expect(client.sendJSON).toHaveBeenCalledWith({
+        method: 'get',
+        url: `/conversations/${conversationId.domain}/${conversationId.id}/description`,
+      });
+    });
+  });
+
+  describe('putConversationDescription', () => {
+    it('updates the encrypted conversation description', async () => {
+      const conversationId = generateQualifiedId();
+      const descriptionUpdate = {base_version: 1, ciphertext: 'new-encrypted-description'};
+
+      await conversationApi.putConversationDescription(conversationId, descriptionUpdate);
+
+      expect(client.sendJSON).toHaveBeenCalledWith({
+        data: descriptionUpdate,
+        method: 'put',
+        url: `/conversations/${conversationId.domain}/${conversationId.id}/description`,
+      });
+    });
+  });
+
   describe('getConversationList', () => {
     it('returns a full list of conversations', async () => {
       const allIds = Array.from({length: 10}, generateQualifiedId);
diff --git a/libraries/api-client/src/conversation/conversationApi/conversationApi.ts b/libraries/api-client/src/conversation/conversationApi/conversationApi.ts
index 1f42e18f178..3daeba8be79 100644
--- a/libraries/api-client/src/conversation/conversationApi/conversationApi.ts
+++ b/libraries/api-client/src/conversation/conversationApi/conversationApi.ts
@@ -61,6 +61,8 @@ import {
 } from '../conversationError';
 import {
   ConversationAccessUpdateData,
+  ConversationDescriptionResponse,
+  ConversationDescriptionUpdateData,
   ConversationJoinData,
   ConversationMemberUpdateData,
   ConversationMessageTimerUpdateData,
@@ -98,6 +100,7 @@ export class ConversationAPI {
     CODE: 'code',
     CODE_CHECK: 'code-check',
     CONVERSATIONS: 'conversations',
+    DESCRIPTION: 'description',
     SUBCONVERSATIONS: 'subconversations',
     GROUP_INFO: 'groupinfo',
     MLS: 'mls',
@@ -810,6 +813,40 @@ export class ConversationAPI {
     return response.data;
   }
 
+  /**
+   * Get encrypted conversation description.
+   * @param conversationId The conversation ID
+   * @see https://nginz-https.bella.wire.link/v17/api/swagger-ui/#/default/get-conversation-description
+   */
+  public async getConversationDescription(conversationId: QualifiedId): Promise<ConversationDescriptionResponse> {
+    const config: AxiosRequestConfig = {
+      method: 'get',
+      url: `${this.generateBaseConversationUrl(conversationId)}/${ConversationAPI.URL.DESCRIPTION}`,
+    };
+
+    const response = await this.client.sendJSON<ConversationDescriptionResponse>(config);
+    return response.data;
+  }
+
+  /**
+   * Update encrypted conversation description.
+   * @param conversationId The conversation ID
+   * @param descriptionData The encrypted description update data
+   * @see https://nginz-https.bella.wire.link/v17/api/swagger-ui/#/default/update-conversation-description
+   */
+  public async putConversationDescription(
+    conversationId: QualifiedId,
+    descriptionData: ConversationDescriptionUpdateData,
+  ): Promise<void> {
+    const config: AxiosRequestConfig = {
+      data: descriptionData,
+      method: 'put',
+      url: `${this.generateBaseConversationUrl(conversationId)}/${ConversationAPI.URL.DESCRIPTION}`,
+    };
+
+    await this.client.sendJSON(config);
+  }
+
   /**
    * Update the message timer for a conversation.
    * @param conversationId The conversation ID
diff --git a/libraries/api-client/src/conversation/data/conversationDescriptionData.ts b/libraries/api-client/src/conversation/data/conversationDescriptionData.ts
new file mode 100644
index 00000000000..6ff5364adcb
--- /dev/null
+++ b/libraries/api-client/src/conversation/data/conversationDescriptionData.ts
@@ -0,0 +1,30 @@
+/*
+ * Wire
+ * Copyright (C) 2026 Wire Swiss GmbH
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see http://www.gnu.org/licenses/.
+ *
+ */
+
+/** Response from GET /conversations/:domain/:id/description */
+export interface ConversationDescriptionResponse {
+  version: number;
+  ciphertext: string;
+}
+
+/** Request body for PUT /conversations/:domain/:id/description */
+export interface ConversationDescriptionUpdateData {
+  base_version: number;
+  ciphertext: string;
+}
diff --git a/libraries/api-client/src/conversation/data/index.ts b/libraries/api-client/src/conversation/data/index.ts
index a7cb00f9919..2a45f504f7f 100644
--- a/libraries/api-client/src/conversation/data/index.ts
+++ b/libraries/api-client/src/conversation/data/index.ts
@@ -21,6 +21,7 @@ export * from './conversationAccessUpdateData';
 export * from './conversationCodeUpdateData';
 export * from './conversationConnectRequestData';
 export * from './conversationCreateData';
+export * from './conversationDescriptionData';
 export * from './conversationJoinData';
 export * from './conversationMemberJoinData';
 export * from './conversationMemberLeaveData';