diff --git a/lib/converters/imagemagickService.ts b/lib/converters/imagemagickService.ts
index 1d12160..5bb3735 100644
--- a/lib/converters/imagemagickService.ts
+++ b/lib/converters/imagemagickService.ts
@@ -39,6 +39,9 @@ export async function convertWithImageMagick(
     let result: Uint8Array | undefined;
 
     await ImageMagick.read(inputData, (image) => {
+      // Set the output format first
+      image.format = outputFormatEnum;
+
       // Apply quality setting if specified
       if (options.imageQuality !== undefined) {
         image.quality = options.imageQuality;
@@ -65,10 +68,8 @@ export async function convertWithImageMagick(
 
       if (onProgress) onProgress(70);
 
-      // Write to output format
-      image.write(outputFormatEnum, (data) => {
-        result = data;
-      });
+      // Write the image data
+      result = image.write((data) => data);
 
       if (onProgress) onProgress(90);
     });