diff --git a/backend/main.py b/backend/main.py
index eb41d18..4d22f8f 100644
--- a/backend/main.py
+++ b/backend/main.py
@@ -380,7 +380,7 @@ app.mount("/img",   StaticFiles(directory=f"{STATIC_DIR}/img"),    name="img")
 # (Range nativ, keine App-CPU) — siehe docs/TILE_SERVER_HANDOVER.md, Entscheidung #2.
 _TILES_DIR = os.getenv("TILES_DIR", "/data/tiles")
 
-@app.get("/tiles/{filename}")
+@app.api_route("/tiles/{filename}", methods=["GET", "HEAD"])
 async def serve_tile(filename: str, request: Request):
     # Kein Path-Traversal
     if "/" in filename or "\\" in filename or ".." in filename:
@@ -390,6 +390,11 @@ async def serve_tile(filename: str, request: Request):
         return Response(status_code=404)
     file_size = os.path.getsize(path)
     base_headers = {"Accept-Ranges": "bytes", "Cache-Control": "public, max-age=86400"}
+    if request.method == "HEAD":
+        return Response(
+            status_code=200, media_type="application/octet-stream",
+            headers={**base_headers, "Content-Length": str(file_size)},
+        )
     range_header = request.headers.get("range")
     if range_header and range_header.startswith("bytes="):
         rng = range_header[6:].split(",")[0]          # nur erster Range (pmtiles nutzt single-range)