diff --git a/web/src/components/MessageComposer.tsx b/web/src/components/MessageComposer.tsx
index 347f7b9..cdb4ab7 100644
--- a/web/src/components/MessageComposer.tsx
+++ b/web/src/components/MessageComposer.tsx
@@ -108,6 +108,7 @@ export function MessageComposer() {
   const pointerUpHandlerRef = useRef<((event: globalThis.PointerEvent) => void) | null>(null);
   const recordingStateRef = useRef<RecordingState>("idle");
   const lastEditingMessageIdRef = useRef<number | null>(null);
+  const prevActiveChatIdRef = useRef<number | null>(null);
 
   const [isUploading, setIsUploading] = useState(false);
   const [uploadProgress, setUploadProgress] = useState(0);
@@ -255,6 +256,15 @@ export function MessageComposer() {
     }
   }, [activeChatId]);
 
+  useEffect(() => {
+    const prev = prevActiveChatIdRef.current;
+    if (prev && prev !== activeChatId) {
+      const ws = getWs();
+      ws?.send(JSON.stringify({ event: "typing_stop", payload: { chat_id: prev } }));
+    }
+    prevActiveChatIdRef.current = activeChatId;
+  }, [activeChatId]);
+
   useEffect(() => {
     const onVisibility = () => {
       if (document.visibilityState === "hidden" && recordingStateRef.current === "recording") {
@@ -1297,6 +1307,11 @@ export function MessageComposer() {
               sendRealtimeChatEvent(next.trim().length > 0 ? "typing_start" : "typing_stop");
             }
           }}
+          onBlur={() => {
+            if (activeChatId) {
+              sendRealtimeChatEvent("typing_stop");
+            }
+          }}
         />
 
         {hasTextToSend ? (