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M4B to MP3

Convert M4B audiobooks to MP3 for any player. Free, with no upload.

Files stay on your device

Drop files to convert

See their format, then choose an output.

MP3, M4A, WAV, FLAC, and other audio, or a video with sound. You can also drag in a whole folder.

How to convert M4B to MP3

Audiobooks often come as M4B files, which a lot of players and car stereos don't open. Open one here and save it as an MP3 that plays anywhere. The M4B to MP3 converter runs in your browser, so the book stays on your device.

  1. Step 1

    Choose your M4B files
    Pick one or many, or drop them into the converter above.

  2. Step 2

    Keep MP3
    MP3 is selected; choose another audio format if you need one.

  3. Step 3

    Download the MP3
    Save each file when it's converted.

What to expect

Supported inputs
M4B audiobooks without copy protection, and any other audio or video file.
What happens
The AAC sound is decoded and encoded as one MP3 for the whole book. MP3 is selected first; you can choose another audio format.
Limits
The MP3 doesn't keep the book's chapter marks. Copy-protected audiobooks can't be converted. A long book takes a while, and it depends on your device's memory.

Private by design

Your video stays on your device

Mastershot processes your file locally in this browser. It does not need to be uploaded to a server, and you do not need an account to use the tool.

  • No upload
  • No signup
  • No watermark

Questions

An audiobook: AAC sound in an MP4 file, like an M4A, usually with chapter marks so players can skip between chapters.

Books bought from some shops are copy-protected, and only their own apps can play them. Files without protection, such as ones you made or downloaded from free libraries, convert.

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