M4B to MP3
Converter
Turn an M4B audiobook into a plain MP3 that plays in any podcast app, car stereo or MP3 player.
Convert M4B to MP3 free →No account needed · Up to 25 MB free · Files permanently deleted after 1 hour
How it works
Common questions
Do chapters survive the conversion?
MP3 has no real chapter standard, so the output is one continuous audio file. Most podcast apps let you bookmark position, which covers the common use.
Will DRM-protected audiobooks convert?
No — files with DRM (e.g. Audible .aax, or protected store purchases) cannot be converted, and removing DRM isn't something we do. DRM-free M4B files convert perfectly.
What bitrate is the MP3?
192 kbps — transparent for spoken word, and it keeps a 10-hour audiobook to a sane size. Choose WAV if you want the decoded audio untouched.
Is there a file size limit?
Free users can convert files up to 25 MB without an account. Pro raises that to 500 MB per file with 3,000 credits a month; Business goes to 5 GB.