diff --git a/mcp/packages/plugin/src/PenpotUtils.ts b/mcp/packages/plugin/src/PenpotUtils.ts
index 964cf70f4c..291978d52c 100644
--- a/mcp/packages/plugin/src/PenpotUtils.ts
+++ b/mcp/packages/plugin/src/PenpotUtils.ts
@@ -298,39 +298,16 @@ export class PenpotUtils {
 
     /**
      * Decodes a base64 string to a Uint8Array.
-     * This is required because the Penpot plugin environment does not provide the atob function.
      *
      * @param base64 - The base64-encoded string to decode
      * @returns The decoded data as a Uint8Array
      */
-    public static atob(base64: string): Uint8Array {
-        const chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
-        const lookup = new Uint8Array(256);
-        for (let i = 0; i < chars.length; i++) {
-            lookup[chars.charCodeAt(i)] = i;
+    public static base64ToByteArray(base64: string): Uint8Array {
+        const binary = atob(base64);
+        const bytes = new Uint8Array(binary.length);
+        for (let i = 0; i < binary.length; i++) {
+            bytes[i] = binary.charCodeAt(i);
         }
-
-        let bufferLength = base64.length * 0.75;
-        if (base64[base64.length - 1] === "=") {
-            bufferLength--;
-            if (base64[base64.length - 2] === "=") {
-                bufferLength--;
-            }
-        }
-
-        const bytes = new Uint8Array(bufferLength);
-        let p = 0;
-        for (let i = 0; i < base64.length; i += 4) {
-            const encoded1 = lookup[base64.charCodeAt(i)];
-            const encoded2 = lookup[base64.charCodeAt(i + 1)];
-            const encoded3 = lookup[base64.charCodeAt(i + 2)];
-            const encoded4 = lookup[base64.charCodeAt(i + 3)];
-
-            bytes[p++] = (encoded1 << 2) | (encoded2 >> 4);
-            bytes[p++] = ((encoded2 & 15) << 4) | (encoded3 >> 2);
-            bytes[p++] = ((encoded3 & 3) << 6) | (encoded4 & 63);
-        }
-
         return bytes;
     }
 
@@ -360,7 +337,7 @@ export class PenpotUtils {
         height: number | undefined
     ): Promise<Rectangle> {
         // convert base64 to Uint8Array
-        const bytes = PenpotUtils.atob(base64);
+        const bytes = PenpotUtils.base64ToByteArray(base64);
 
         // upload the image data to Penpot
         const imageData = await penpot.uploadMediaData(name, bytes, mimeType);