How to open a .m4b file
Quick, free ways to open M4B on any system.
A .m4b file is a MPEG-4 Audiobook. If double-clicking does nothing, your computer simply does not have an app that reads M4B yet. Here is how to fix that on each operating system, using free software wherever possible.
Open a .m4b file step by step
- Confirm the file really is a .m4b. Drop it into the WhatFileType file identifier, which reads its signature without uploading anything.
- On Windows, open it with VLC or AIMP.
- On Mac, use Apple Books or VLC.
- On Linux, try VLC or Cozy.
- Still stuck? Convert the .m4b to mp3, which opens more widely.
Best apps to open .m4b files
Windows
- VLC
- AIMP
- Audiobookshelf
macOS
- Apple Books
- VLC
- Audiobookshelf
Linux
- VLC
- Cozy
- ffmpeg
!
Before you open it: Safe. M4B is an audiobook container read by a media player. Some store-bought files carry DRM.
Frequently asked questions
Why can't I open my .m4b file?
Almost always because no installed app understands M4B. Install one of the apps above, or convert the file to a format your existing software already reads.
How do I open an .m4b file?
Apple Books plays it on Apple devices; VLC and audiobook apps like Audiobookshelf open it elsewhere, keeping the chapters.
What is the difference between M4A and M4B?
Both are MPEG-4 audio. M4B adds chapters and remembers your position, and apps treat it as an audiobook rather than music.