diff --git a/app.py b/app.py
index fbea29e..a94a4c2 100644
--- a/app.py
+++ b/app.py
@@ -422,6 +422,10 @@ async def remove_background(
         log["source"] = "url" if url else "file"
         if url:
             log["url_host"] = urlparse(url).hostname or "-"
+            # Full URL for debugging. NOTE: presigned URLs put their auth token in
+            # the query string, so this lands credentials in the log -- acceptable
+            # here (trusted callers, private log); drop the query if that changes.
+            log["url"] = url[:512]
         log["seg_model"] = normalized_seg
         log["cross_check"] = "on" if effective_cc else "off"
         log["background_mode"] = effective_bg