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M4B File Format

MPEG-4 Audiobook category

M4B is the audiobook flavour of M4A — AAC audio with chapter markers, used by Audible and Apple Books.

Typical use: Converting M4B to MP3 frees audiobooks to play on car stereos, dumb players and anything without chapter support.

About the M4B format

M4B is M4A wearing an audiobook badge: the same AAC audio in an MP4 container, plus chapter markers that Apple Books and Audible apps render as a scrubbing timeline. Buy an audiobook outside Audible and it likely arrives as M4B.

The format is deliberately chained to Apple's book ecosystem. Converting M4B to MP3 sets the book free: car stereos, gym players, old iPods and every app without chapter support will play it — though the chapter marks themselves are flattened away.

Strengths

  • ✓ Chapter markers survive on Apple platforms
  • ✓ Efficient AAC audio

Limitations

  • ✗ Chapters vanish in MP3 conversion
  • ✗ Non-Apple support is patchy
Compression
Lossy AAC + chapters
Quality
Speech-optimized bitrates
Compatibility
Apple Books, Audible
Best for
Chaptered audiobooks

Convert M4B to…

25 direct directions plus 18 workflows, sorted A–Z; 🔥 marks popular targets.

M4B to AAC Hot M4B to AC3 M4B to AIF M4B to AIFF M4B to ALAC M4B to AU M4B to CAF M4B to E-AC3 M4B to F4A M4B to FLAC Hot M4B to GSM M4B to M4A Hot M4B to M4R M4B to MP2 M4B to MP3 Hot M4B to OGA M4B to OGG Hot M4B to OPUS M4B to PCM M4B to TTA M4B to VOC M4B to W64 M4B to WAV Hot M4B to WAVPCM M4B to WV

Cross-engine workflows

M4B to 7Z M4B to APK M4B to JAR M4B to MKV M4B to MOV M4B to MP4 M4B to PNG M4B to PNG24 M4B to PNG8 M4B to TAR M4B to TAR.BZ2 M4B to TAR.GZ M4B to TAR.XZ M4B to TBZ2 M4B to TGZ M4B to TXZ M4B to WIM M4B to ZIP

Convert other files to M4B…

AAC to M4B Hot AC3 to M4B AIF to M4B AIFF to M4B ALAC to M4B AMB to M4B AMR to M4B APE to M4B AU to M4B AVR to M4B CAF to M4B CVS to M4B CVU to M4B DSS to M4B DTS to M4B E-AC3 to M4B F32 to M4B F4A to M4B F64 to M4B FAP to M4B FLAC to M4B Hot FSSD to M4B GSM to M4B GSRT to M4B HCOM to M4B HTK to M4B IRCAM to M4B M4A to M4B Hot M4R to M4B MAUD to M4B MOD to M4B MP2 to M4B MP3 to M4B Hot OGA to M4B OGG to M4B Hot OMA to M4B OPUS to M4B PAF to M4B PVF to M4B QCP to M4B S16 to M4B S24 to M4B S32 to M4B S3M to M4B SD2 to M4B SHN to M4B SMP to M4B SNDR to M4B SNDT to M4B SPX to M4B TAK to M4B TTA to M4B TXW to M4B U8 to M4B VMS to M4B VOC to M4B VQF to M4B W64 to M4B WAV to M4B Hot WAVPCM to M4B WMA to M4B WV to M4B WVE to M4B XI to M4B XM to M4B

Cross-engine workflows

3G2 to M4B 3GP to M4B ASF to M4B AVI to M4B DivX to M4B DV to M4B F4V to M4B FLV to M4B H.264 to M4B M1V to M4B M2TS to M4B M2V to M4B M4V to M4B MJPEG to M4B MKV to M4B MOV to M4B MP4 to M4B MPEG to M4B MPEG1 to M4B MPEG2 to M4B MPEG4 to M4B MPG to M4B MTS to M4B MXF to M4B OGV to M4B RM to M4B RMVB to M4B TS to M4B VOB to M4B WEBM to M4B WMV to M4B WTV to M4B Xvid to M4B Y4M to M4B

Frequently asked questions

What is a M4B file?

M4B is the audiobook flavour of M4A — AAC audio with chapter markers, used by Audible and Apple Books.

How do I convert M4B files online?

Pick a target format from the "Convert M4B to…" list below, drop your file and hit convert. Everything runs in your browser — no install, no upload, no watermark, no limits.

Is it safe to convert M4B files here?

Yes. Every conversion is performed by your own device inside the browser — files never leave for a server, and the page keeps working even offline.

Which formats can M4B convert to?

This page lists all 43 directions across documents, images, audio, video, spreadsheets and archives — each one is its own free converter page.