5 formats support.
Listen to music using built-in player.
ID3-tag support.
Multiple files conversion.
Professional quality.
User friendly interface.
Absolutely free.

Absolutely Free

As its name suggests, Free M4a to MP3 Converter is absolutely free. No limitations, no registration. Just download it and start converting M4a to MP3. As with all products from ManiacTools, the program doesn't contain any viruses or malware.