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

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