diff --git a/backend/main.py b/backend/main.py
index ac9b1fc..e1fe7d9 100644
--- a/backend/main.py
+++ b/backend/main.py
@@ -223,8 +223,8 @@ async def get_attachment(username: str, filename: str, _: None = Depends(require
 # ---------------------------------------------------------------------------
 
 @app.get("/api/tags")
-async def tags(_: None = Depends(require_access)):
-    return await notes.tag_counts()
+async def tags(request: Request, _: None = Depends(require_access)):
+    return await notes.tag_counts(current_user(request))
 
 
 @app.get("/api/search")
diff --git a/backend/notes.py b/backend/notes.py
index eab55aa..dd7147a 100644
--- a/backend/notes.py
+++ b/backend/notes.py
@@ -315,14 +315,23 @@ async def _attach_meta(notes: list[dict]) -> None:
         note.pop("path", None)
 
 
-async def tag_counts() -> list[dict]:
+async def tag_counts(username: str) -> list[dict]:
     async with aiosqlite.connect(settings.database_path) as db:
         db.row_factory = aiosqlite.Row
+        names = (
+            [username, settings.common_space]
+            if username != settings.common_space
+            else [settings.common_space]
+        )
+        placeholders = ",".join("?" for _ in names)
         rows = await db.execute(
             "SELECT t.name, COUNT(nt.note_id) AS count"
             " FROM tags t JOIN note_tags nt ON nt.tag_id = t.id"
             " JOIN notes n ON n.id = nt.note_id AND n.deleted_at IS NULL"
-            " GROUP BY t.id ORDER BY count DESC, t.name LIMIT 50"
+            " JOIN users u ON u.id = n.user_id"
+            f" WHERE u.name IN ({placeholders})"
+            " GROUP BY t.id ORDER BY count DESC, t.name LIMIT 50",
+            names,
         )
         return [dict(r) for r in await rows.fetchall()]