41 votes
M4B File - What is an .m4b file and how do I open it?
Learn about .M4B files and view a list of programs that open them.
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Overview
What is an M4B file? An M4B file is an audiobook file saved in the MPEG-4 format and typically used by Apple Books and iTunes. It stores spoken audio encoded with Advanced Audio Coding (AAC) compression, which reduces file size while maintaining clear sound quality. M4B files are similar to M4A audio files but include additional features designed for audiobooks, such as chapter markers and the ability to remember playback position.
More Information M4B file open in Apple Books M4B files are commonly distributed through Apple's audiobook platforms and are often protected by FairPlay digital rights management ( DRM ). DRM protection restricts playback to authorized devices and accounts. For example, if a user purchases M4B files via Apple, they can only play them with Apple Books, iTunes, or other Apple software linked to the user's account. However, unprotected M4B files, such as those created by users or distributed freely, can be played by any media player that supports the MPEG-4 audio format.
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DeveloperApple
Popularity3.6 | 41 Votes
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.M4B File Extension
MPEG-4 Audiobook
| Developer | Apple |
| Popularity |
3.6 | 41 Votes |
NEW: Open your .M4B file online with File Helper . View Online
What is an M4B file?
An M4B file is an audiobook file saved in the MPEG-4 format and typically used by Apple Books and iTunes. It stores spoken audio encoded with Advanced Audio Coding (AAC) compression, which reduces file size while maintaining clear sound quality. M4B files are similar to M4A audio files but include additional features designed for audiobooks, such as chapter markers and the ability to remember playback position.
More Information
M4B file open in Apple Books
M4B files are commonly distributed through Apple's audiobook platforms and are often protected by FairPlay digital rights management ( DRM ). DRM protection restricts playback to authorized devices and accounts.
For example, if a user purchases M4B files via Apple, they can only play them with Apple Books, iTunes, or other Apple software linked to the user's account. However, unprotected M4B files, such as those created by users or distributed freely, can be played by any media player that supports the MPEG-4 audio format.
How to open an M4B file
You can open M4B files with various programs, including Microsoft Windows Media Player , Apple Books , and VideoLAN VLC media player . However, you can only open a copy-protected M4B file with software linked to the account that purchased it.
How to convert an M4B file
VideoLAN VLC media player (multiplatform) can convert non-copy-protected M4B files to the following audio formats:
TuneFab iTunes Audio Converter (Windows, Mac) and Viwizard Audio Converter (Windows, Mac) can remove copy-protection from protected M4B files and convert them to MP3 and other audio formats. Keep in mind that removing copy-protection for your own use is legal, but sharing previously copy-protected files is illegal.
Programs that open M4B files
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Platform
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X
Windows
File Viewer Plus
—
Get it from Microsoft
Free +
Apple iTunes
—
Discontinued
Free
Microsoft Windows Media Player
Included with OS
VideoLAN VLC media player
Free
Audacity with optional FFmpeg library installed
Free
TuneFab iTunes Audio Converter
Free Trial
Viwizard Audio Converter
Free Trial
AIMP
Free
Mac
Apple Books
Included with OS
VideoLAN VLC media player
Free
Audacity with optional FFmpeg library installed
Free
TuneFab iTunes Audio Converter
Free Trial
Viwizard Audio Converter
Free Trial
Linux
VideoLAN VLC media player
Free
Audacity with optional FFmpeg library installed
Free
Web
FileHelper.com
Free
iOS
Apple Books
Included with OS
Android
Smart AudioBook Player
Free +
VideoLAN VLC media player
Free
Category: Audio Files
Updated: November 10, 2025