M4B File Type

- The quick facts

What are M4B files and how to open them

Are you having problems opening a M4B file or just wondering what they contain? We explain what these files are used for and show you software that we know can open or otherwise handle your files.

What is a M4B file?

A .M4B file is an iTunes Audio Book file.

Files that contain the .m4b file extension are used to store audiobooks that are downloaded from the Apple iTunes Store. M4B audiobooks are copy-protected using the Apple "FairPlay" DRM technology.

The Apple FairPlay DRM technology prevents a user from playing audiobooks on unauthorized computers and devices. A user may authorize up to five computers on a single iTunes account to play the audiobook. If the user wants to play the audiobook on more than five computers, they must create another account and purchase the book on the second account for an additional five computers.

The M4B file format is based on the MPEG-4 container file format. M4B files are usually compressed using AAC encoding. M4B files are similar to M4A files, but the M4B format allows for bookmarking of the files, making the M4B format more suitable for audiobooks and podcasts.

How to open M4B files

We have identified one M4B opener that is compatible with this specific type of M4B file.

Programs that open iTunes Audio Book files

Last updated: March 17, 2022

Suggest another file format using extension M4B

While we know of one file format using the .M4B file extension, there may be more. It is widespread that different programs use files with the same file extension for very different types of data. Please let us know if you are aware of a different kind of .M4B file.

Various apps that use files with this extension

These apps are known to open certain types of M4B files. Remember, different programs may use M4B files for different purposes, so you may need to try out a few of them to be able to open your specific file.