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.M4B File Extension

File TypeMPEG-4 Audiobook File

3.4 (29 Votes)
CategoryAudio Files

What is an M4B 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.

More Information

Screenshot of a .m4b file in Apple Books

M4B file open in Apple Books

Apple copy-protects the M4B files they provide using FairPlay DRM. This means M4B files that you download via iTunes or Apple Books can be played only on authorized computers and Apple devices, using iTunes or Apple Books. So if you are having trouble playing an M4B file, it might be because you are not playing it in iTunes or Apple Books, or because your device is not authorized to play it.

How do I open an M4B file?

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.

Open and view .M4B files with File Viewer Plus.

Programs that open M4B files

Updated 7/7/2020

About M4B Files

Our goal is to help you understand what a file with a *.m4b suffix is and how to open it.

The MPEG-4 Audiobook file type, file format description, and Mac, Windows, Android, and iOS programs listed on this page have been individually researched and verified by the FileInfo team. We strive for 100% accuracy and only publish information about file formats that we have tested and validated.

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