diff --git a/packages/wallet-webui/src/routes/App.tsx b/packages/wallet-webui/src/routes/App.tsx
index e649abaf4..399057537 100644
--- a/packages/wallet-webui/src/routes/App.tsx
+++ b/packages/wallet-webui/src/routes/App.tsx
@@ -3096,10 +3096,12 @@ function QrScanRoute() {
   const [, navigate] = useLocation();
   const videoRef = useRef<HTMLVideoElement>(null);
   const [error, setError] = useState<string>();
+  const [rejected, setRejected] = useState<string>();
   useEffect(() => {
     let stream: MediaStream | undefined;
     let frame = 0;
     let finished = false;
+    let lastRejected: string | undefined;
     const canvas = document.createElement("canvas");
     const scan = async () => {
       const video = videoRef.current;
@@ -3120,7 +3122,11 @@ function QrScanRoute() {
             navigate(`/action/${entry.id}`, { replace: true });
             return;
           } catch {
-            // Ignore non-Taler QR payloads and keep scanning.
+            // Not a Taler link: say so, and keep scanning.
+            if (code.data !== lastRejected) {
+              lastRejected = code.data;
+              setRejected(code.data);
+            }
           }
         }
       }
@@ -3164,6 +3170,7 @@ function QrScanRoute() {
     <QrScannerScreen
       videoRef={videoRef}
       error={error}
+      rejected={rejected}
       onEnterLink={() => navigate("/enter")}
       onCancel={() => navigate("/")}
     />
diff --git a/packages/wallet-webui/src/screens/QrScannerScreen.tsx b/packages/wallet-webui/src/screens/QrScannerScreen.tsx
index 51f47e14f..5638fe6fc 100644
--- a/packages/wallet-webui/src/screens/QrScannerScreen.tsx
+++ b/packages/wallet-webui/src/screens/QrScannerScreen.tsx
@@ -6,6 +6,8 @@ import { i18n } from "../i18n/runtime.js";
 export function QrScannerScreen(props: {
   videoRef: Ref<HTMLVideoElement>;
   error?: string;
+  /** Content of the last scanned QR code that is not a usable Taler link. */
+  rejected?: string;
   onEnterLink: () => void;
   onCancel: () => void;
 }) {
@@ -31,6 +33,16 @@ export function QrScannerScreen(props: {
             muted
           />
         )}
+        {props.rejected !== undefined && (
+          <div role="status" class="mt-4 rounded-xl bg-errorContainer p-3 text-onErrorContainer">
+            <p>{i18n.str`This wallet action is invalid or unsupported.`}</p>
+            <p class="mt-1 break-all font-mono text-xs">
+              {props.rejected.length > 120
+                ? `${props.rejected.slice(0, 120)}…`
+                : props.rejected}
+            </p>
+          </div>
+        )}
         <div class="mt-4 flex flex-wrap gap-3">
           <Button
             tone="secondary"