Convert MPEG-4 Audiobook (.m4b) to Android Audio (.android-audio) online for free. Fast, secure audio conversion with no watermarks or registration.
Upload your .m4b file by dragging it into the upload area or clicking to browse.
Choose your output settings. The default settings work great for most files.
Click Convert and download your .m4a file when it's ready.
Android can play M4B files natively in some media players (Smart Audiobook Player, Voice Audiobook Player), but the stock Music app and many third-party players do not recognize M4B's chapter markers or bookmarking. Converting M4B to Android-optimized audio means encoding to AAC in an M4A container or MP3, which plays universally across all Android audiobook and music apps. The trade-off is losing M4B's native chapter and bookmark functionality.
Android's built-in media player does not treat M4B specially — it plays the audio but ignores chapters and bookmarks. Dedicated Android audiobook apps (Smart Audiobook Player, Listen Audiobook Player) support M4B natively, but if you prefer a general-purpose music player or want to share audiobook content broadly, converting to M4A or MP3 ensures universal Android compatibility. Splitting by chapter during conversion creates individual tracks that any music player can navigate.
FFmpeg reads the M4B, extracts chapter metadata, and optionally splits the audio at chapter boundaries. Each chapter is encoded as AAC-LC in an M4A container (preserving reasonable quality at 64-96 kbps for speech) or as MP3 at 128 kbps. If no chapter splitting is desired, the entire audiobook is output as a single M4A or MP3 file. Android's MediaStore indexes the output files normally.
M4B audiobooks are typically 32-64 kbps AAC. Converting to M4A with AAC at the same bitrate via stream copy preserves identical quality. Re-encoding to MP3 at 128 kbps provides equivalent or better quality for spoken word. No audible quality difference for narration.
| Device | M4B | Android Audio |
|---|---|---|
| Windows PC | Partial | Partial |
| macOS | Partial | Partial |
| iPhone/iPad | Partial | Partial |
| Android | Partial | Partial |
| Linux | Partial | Partial |
| Web Browser | No |
Resolution: N/A
Bitrate: 320 kbps
OGG Vorbis preferred
Resolution: N/A
Bitrate: 256 kbps
AAC format required
Resolution: N/A
Bitrate: 128 kbps
Lossless FLAC/WAV for best quality
Resolution: N/A
Bitrate: 128 kbps
MP3 mono for spoken word
M4B to Android Audio conversion trades chapter markers for universal compatibility. Split by chapter during conversion to maintain navigability across all Android players.
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Fungerar overallt
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| No |
| Funktion | M4B | Android Audio |
|---|---|---|
| Fullstandigt namn | MPEG-4 Audiobook | Android Compatible Audio |
| Filandelse | .m4b | .m4a |
| Bast for | Chapter support | Android optimized |