Audio format
What is a .m4b file?
The audiobook flavor of M4A: the same MP4 with AAC audio, plus chapters and a bookmark that remembers where you stopped listening. Audio players recognize it and skip the chapter titles accordingly.
fileclay opens and writes M4B
When to use M4B
- Best for
- Audiobooks and long spoken-word files.
- Advantages
- Remembers where you stopped and splits the book into chapters.
- Disadvantages
- Mainly useful for audiobooks.
Convert M4B files
From M4B
All 18 output formats: .mp3, .wav, .m4a, .ogg, .aac, .flac, .opus, .oga, .aiff, .aif, .wma, .ac3, .mka, .caf, .au, .tta, .wv, .mp2
Conversions run in your browser. Files aren’t uploaded.
Questions about M4B
How do I convert my files to .m4b?
Open the fileclay converter, drop your file in and pick .m4b as the output format. It runs inside your browser with WebAssembly, so nothing is uploaded, there’s no account and no watermark.
Which formats can I convert M4B files into?
fileclay can write 19 formats from a M4B file, including MP3, WAV, M4A, OGG, AAC and FLAC. Pick any of them as the output format when you drop the file in.
Is M4B lossless?
No. M4B compresses with loss: it discards detail to make the file smaller, and that detail can’t be recovered.