Compare software

Free M4a to MP3 Converter vs AudioBookConverter: catalog facts
Free M4a to MP3 Converter	AudioBookConverter
Free Freeware with no charge.	Free Free and open source under the GPL-2.0.
Windows	Windows
Handles M4b audiobooks and other rarer MPEG-4 audio formats Converts whole folders including subfolders	Flexible chapter handling from files, M4B or CUE data Parallel encoding and a conversion queue
Windows only Output limited to MP3 and WAV	Focused on M4B output only Project page gives little detail on releases or platforms
Downloadable app	Downloadable app
Closed source	Open source
License: Freeware	License: GPL-2.0-only
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.