diff --git a/internal/web/source/lib/keyboard-shortcut-guard.ts b/internal/web/source/lib/keyboard-shortcut-guard.ts
new file mode 100644
index 0000000..2d46940
--- /dev/null
+++ b/internal/web/source/lib/keyboard-shortcut-guard.ts
@@ -0,0 +1,46 @@
+function isEditableTarget(target: EventTarget | null): target is HTMLElement {
+  if (!(target instanceof HTMLElement)) {
+    return false
+  }
+
+  if (target.isContentEditable) {
+    return true
+  }
+
+  const tag = target.tagName
+  return tag === "INPUT" || tag === "TEXTAREA" || tag === "SELECT"
+}
+
+function shouldIgnoreShortcut(event: KeyboardEvent): boolean {
+  if (event.ctrlKey || event.metaKey || event.altKey) {
+    return false
+  }
+
+  if (event.isComposing) {
+    return false
+  }
+
+  return isEditableTarget(event.target) && event.key.length === 1
+}
+
+function installGuard(): void {
+  window.addEventListener(
+    "keydown",
+    (event) => {
+      if (!shouldIgnoreShortcut(event)) {
+        return
+      }
+
+      event.stopImmediatePropagation()
+    },
+    true
+  )
+}
+
+if (typeof window !== "undefined") {
+  if (document.readyState === "loading") {
+    document.addEventListener("DOMContentLoaded", installGuard, { once: true })
+  } else {
+    installGuard()
+  }
+}
diff --git a/internal/web/source/lib/utils.ts b/internal/web/source/lib/utils.ts
index bd0c391..46920d6 100644
--- a/internal/web/source/lib/utils.ts
+++ b/internal/web/source/lib/utils.ts
@@ -1,5 +1,6 @@
 import { clsx, type ClassValue } from "clsx"
 import { twMerge } from "tailwind-merge"
+import "./keyboard-shortcut-guard"
 
 export function cn(...inputs: ClassValue[]) {
   return twMerge(clsx(inputs))