Toolkit is a very useful and free program that can do more besides M4A file to MP3. Solution 1: Toolkit - Windows M4A to MP3 converter You can convert M4A to MP3 Windows, convert M4A to MP3 Mac, as well as convert M4A to MP3 online. Here I will give you three solutions to change M4A to MP3 without the help of iTunes. How do I convert M4A to MP3 without iTunes? How do I convert an M4A to an MP3 on a Mac with iTunes?ġ. Solution 3: CloudConvert - Online M4A to MP3 converter.Solution 2: DVDFab Video Converter - Mac M4A to MP3 converter.Solution 1: Toolkit - Windows M4A to MP3 converter.