1. In the Converter, import the mp3 file, and select the target format MP4.
2. Find the Add Cover button to add your picture (supported picture format: *.JPEG *.JPG *.PNG *.BMP), click Save to save the cover.
3. Click Convert on the interface to start conversion.
4. After the conversion is completed, you can get an mp4 file with a cover in the Finished list.