M4B converter, in your browser.
Convert M4B files to MP3, M4A, WAV and OGG. Everything on this page is converted in your browser, so your files never leave your device.
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About M4B
M4B is an M4A file with a different extension, marking it as an audiobook so that players offer chapters, bookmarks and a remembered position. Inside it is ordinary AAC audio. Podcasts and audiobooks are commonly sold or shared as M4B.
M4B only shows chapters and bookmarks in apps that treat it as an audiobook. M4B keeps a whole book in one file, with chapters, for audiobook apps.
- Stands for
- MPEG-4 audiobook
- Type
- Audio
- Compression
- Lossy (AAC)
- Usually contains
- AAC with chapters
- Introduced
- The 2000s, by Apple
- Opens in
- Apple Books, iTunes and Music, VLC and most audiobook apps
- Best for
- Audiobooks with chapters and a remembered playback position
- File extension
- .m4b
- MIME type
- audio/x-m4b
Questions
How do I open an M4B file?
M4B opens in: Apple Books, iTunes and Music, VLC and most audiobook apps. If your device or app cannot open it, convert it to MP3 or M4A above.
What can I convert M4B to?
ToAny converts M4B to MP3, M4A, WAV and OGG.
Can I convert other files to M4B?
No. ToAny reads M4B files and converts them to other formats, but it does not create M4B.
Are my files uploaded?
No. Every M4B conversion listed here runs inside your browser. The files stay on your device.
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