diff --git a/packages/excalidraw/data/blob.ts b/packages/excalidraw/data/blob.ts
index 27bafaf386..61c283d3e7 100644
--- a/packages/excalidraw/data/blob.ts
+++ b/packages/excalidraw/data/blob.ts
@@ -437,7 +437,7 @@ const getActualMimeTypeFromImage = (buffer: ArrayBuffer) => {
     webp: /^82 73 70 70 \d+ \d+ \d+ \d+ 87 69 66 80 86 80 56/,
   };
 
-  if (leadingBytes === bytes.png) {
+  if (leadingBytes.startsWith(bytes.png)) {
     mimeType = MIME_TYPES.png;
   } else if (leadingBytes.startsWith(bytes.jpg)) {
     mimeType = MIME_TYPES.jpg;