diff --git a/apps/ai-game-creator-shell/src-tauri/src/ui_editor/commands/separation/workflow/extract.rs b/apps/ai-game-creator-shell/src-tauri/src/ui_editor/commands/separation/workflow/extract.rs
index 08d8cffc4..204d9141d 100644
--- a/apps/ai-game-creator-shell/src-tauri/src/ui_editor/commands/separation/workflow/extract.rs
+++ b/apps/ai-game-creator-shell/src-tauri/src/ui_editor/commands/separation/workflow/extract.rs
@@ -154,6 +154,18 @@ mod tests {
         let png = normalize_source_image_to_png(jpeg).expect("convert jpeg");
         assert_eq!(&png[..8], b"\x89PNG\r\n\x1a\n");
     }
+
+    #[test]
+    fn converts_webp_source_to_png() {
+        let image = DynamicImage::ImageRgb8(RgbImage::from_pixel(2, 2, Rgb([0, 128, 255])));
+        let mut webp = Vec::new();
+        image
+            .write_to(&mut Cursor::new(&mut webp), ImageFormat::WebP)
+            .expect("encode webp");
+
+        let png = normalize_source_image_to_png(webp).expect("convert webp");
+        assert_eq!(&png[..8], b"\x89PNG\r\n\x1a\n");
+    }
 }
 
 pub(super) async fn write_processed_image(