diff --git a/src/routes/archive.index.tsx b/src/routes/archive.index.tsx
index 2b7ede3..b5d8b1a 100644
--- a/src/routes/archive.index.tsx
+++ b/src/routes/archive.index.tsx
@@ -62,6 +62,24 @@ function ArchivePage() {
   const [totalCount, setTotalCount] = useState(0);
   const [uploadOpen, setUploadOpen] = useState(false);
   const [newCatOpen, setNewCatOpen] = useState(false);
+  const [lockedTabs, setLockedTabs] = useState<Record<string, boolean>>(() => {
+    if (typeof window === "undefined") return {};
+    try {
+      return JSON.parse(localStorage.getItem("archive-locked-tabs") || "{}");
+    } catch {
+      return {};
+    }
+  });
+  const isLocked = activeId ? lockedTabs[activeId] !== false : true; // default locked
+  const toggleLock = () => {
+    if (!activeId) return;
+    const next = { ...lockedTabs, [activeId]: !isLocked };
+    setLockedTabs(next);
+    try {
+      localStorage.setItem("archive-locked-tabs", JSON.stringify(next));
+    } catch {}
+    toast.success(next[activeId] ? "Tab locked" : "Tab unlocked");
+  };
 
   // Debounce search input (300ms)
   useEffect(() => {