Convert tools.
Convert, merge and shrink audiobook files between MP3, M4B, M4A and more, with chapters and covers intact.
6 free tools · nothing uploaded
- ConvertMP3 to M4B MakerMerge MP3s into one chaptered M4B audiobook with cover and tags.Open
- ConvertM4B to MP3 ConverterConvert an M4B to MP3, as one file or one per chapter.Open
- ConvertMerge Audiobook FilesJoin audio files in any order into one MP3 or M4B.Open
- ConvertAudiobook CompressorShrink audiobooks for your phone without losing clarity.Open
- ConvertSpeed ChangerExport at a new speed without the chipmunk pitch.Open
- ConvertAny Audio to M4BConvert M4A, AAC, FLAC, WAV, OGG or Opus to M4B.Open
About these tools
Audiobooks come in a handful of formats, and every player prefers a different one: M4B for audiobook apps, MP3 for car stereos and older players, M4A for apps that skip .m4b. These tools move a book between them without losing its chapters, cover or tags.
Everything runs on your own device with ffmpeg compiled to WebAssembly, so a 20-hour book is never uploaded. Protected files such as Audible’s AAX can’t be converted; DRM-free books from LibriVox, Libro.fm, CDs you own or your own recordings all work.
Guides that go deeper
Which tool do I need?
| To… | Use |
|---|---|
| Turn a folder of MP3s into one audiobook with chapters | MP3 to M4B Maker |
| Play an M4B in a car, on a CD or a Yoto card | M4B to MP3 Converter |
| Convert M4A, FLAC, WAV, OGG or Opus files to M4B | Any Audio to M4B |
| Join parts or discs into one file | Merge Audiobook Files |
| Make a book small enough for your phone | Audiobook Compressor |
| Save a book permanently at 1.5× or 2× | Speed Changer |