Yes. There are many free M4A to MP3 converters available on the market today, such as FreeConvert, CloudConvert, Zamzar, etc. They all can help you convert M4A files to MP3 format online for free. However, it is important to note that these online tools cannot convert Amazon Prime M4A to MP3 for free online due to DRM protection. If you want to handle DRM-protected Amazon Prime M4A, it is advisable to use desktop software like MuConvert Amazon Music Converter, which can provide richer conversion features.