diff --git a/src/pages/Editor.tsx b/src/pages/Editor.tsx
index d412b55..4b9d344 100644
--- a/src/pages/Editor.tsx
+++ b/src/pages/Editor.tsx
@@ -1380,13 +1380,21 @@ export default function Editor() {
               
               // Fallback: draw ImageBitmap or HTMLImageElement to canvas to extract data URL
               try {
+                const MAX = 1024;
+                let scale = 1;
+                if (img.width > MAX || img.height > MAX) {
+                  scale = MAX / Math.max(img.width, img.height);
+                }
+                const cw = Math.round((img.width || 1024) * scale);
+                const ch = Math.round((img.height || 1024) * scale);
+                
                 const canvas = document.createElement('canvas');
-                canvas.width = img.width || 1024;
-                canvas.height = img.height || 1024;
+                canvas.width = cw;
+                canvas.height = ch;
                 const ctx = canvas.getContext('2d');
                 if (ctx) {
-                  ctx.drawImage(img, 0, 0);
-                  return canvas.toDataURL('image/png');
+                  ctx.drawImage(img, 0, 0, cw, ch);
+                  return canvas.toDataURL('image/webp', 0.8);
                 }
               } catch (e) {
                 console.error('Error extracting texture URL:', e);