M4B file format

MPEG-4 Audiobook

M4B is the audiobook version of M4A and can store chapters and remember the playback position. Apple Books uses it, while most other players and car stereos do not.

Convert M4B to MP3

Where M4B files open

iPhone

Plays in the Books app.

Yes

Car stereos

Most stereos do not recognize M4B files.

No

Android

Needs an audiobook app.

Partly

Convert M4B to

23 formats

Audio

Convert to M4B

57 formats

Video

Audio

Other audio formats