.M4B File Extension

There is only one file type that uses the .M4B extension:

MPEG-4 Audiobook File

MPEG-4 Audiobook File

An M4B file is an audiobook most often used by Apple iTunes and Apple Books. It contains audio that is stored in the MPEG-4 format and compressed using AAC encoding. M4B files are nearly identical to .M4A files except that they support book-related features, such as chapter breaks and bookmarking.

On Windows, you can open an M4B file with Apple iTunes. On Macs and other Apple devices, you can open an M4B file with Apple Books.

Some free audiobook libraries, such as LibriVox, also provide audiobooks in the M4B format. These files are not copy-protected, so you can play them using third-party media players such as VideoLAN VLC media player.

Software's name License Platforms
Apple Books Apple Books Bundled iOSMac
Apple iTunes Apple iTunes Freeware MacWindows
File Viewer Plus File Viewer Plus Free Trial Windows
Microsoft Windows Media Player Microsoft Windows Media Player Bundled Windows
Smart AudioBook Player Smart AudioBook Player Free+ Android
VideoLAN VLC media player VideoLAN VLC media player Open Source AndroidChrome OSiOSLinuxMacWindows

Updated: July 12, 2020

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