diff --git a/apps/ai-game-creator-shell/src/features/ui-editor/useUiEditorFontFaces.ts b/apps/ai-game-creator-shell/src/features/ui-editor/useUiEditorFontFaces.ts
index c3b00de6c..0696ee745 100644
--- a/apps/ai-game-creator-shell/src/features/ui-editor/useUiEditorFontFaces.ts
+++ b/apps/ai-game-creator-shell/src/features/ui-editor/useUiEditorFontFaces.ts
@@ -69,6 +69,8 @@ export function useUiEditorFontFaces(
     for (const font of fontAssets) {
       void (async () => {
         const cssFamily = uiEditorPrivateFontFamily(font.asset_id);
+        let url: string | undefined;
+        let face: FontFace | undefined;
         try {
           if (typeof FontFace === 'undefined' || !document.fonts) {
             throw new Error('FontFace unavailable');
@@ -80,10 +82,10 @@ export function useUiEditorFontFaces(
             expectedSha256: font.content_sha256,
           });
           if (cancelled) return;
-          const url = URL.createObjectURL(
+          url = URL.createObjectURL(
             new Blob([new Uint8Array(bytes)], { type: fontMimeType(font) }),
           );
-          const face = new FontFace(cssFamily, `url(${JSON.stringify(url)})`, {
+          face = new FontFace(cssFamily, `url(${JSON.stringify(url)})`, {
             style: font.metadata.italic ? 'italic' : 'normal',
             weight: String(font.metadata.weight),
           });
@@ -99,6 +101,12 @@ export function useUiEditorFontFaces(
             [font.asset_id]: { cssFamily, status: 'loaded' },
           }));
         } catch {
+          if (face) {
+            document.fonts?.delete(face);
+          }
+          if (url) {
+            URL.revokeObjectURL(url);
+          }
           if (!cancelled) {
             setStates((current) => ({
               ...current,