M4B File - opening and understanding

Did your computer fail to open a M4B file? We explain what they are used for and recommend software that we know can open or otherwise handle your .M4B 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

You will need a program compatible with the specific file you are trying to open, as different programs may use files with file extension M4B for different purposes.

While we have not verified the apps ourselves yet, our users have suggested 10 different M4B openers which you will find listed below.

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 viewers for this file format

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.

Any Video ConverterAny Video ConverterUser submitted
WinRARWinRARUser submitted
iTunesiTunesUser submitted
QuickTimeQuickTimeUser submitted
KMPlayerKMPlayerUser submitted
AIMP3AIMP3User submitted
PotPlayerPotPlayerUser submitted
MediaMonkeyMediaMonkeyUser submitted
Zoom PlayerZoom PlayerUser submitted
5KPlayer5KPlayerUser submitted
We have not verified any software that we know for certain will work with M4B-files on Mac. If you know one, please use the 'Suggest a program' link below and tell us about it!
We have not verified any web services that we know for certain will work with M4B-files. If you know one, please use the 'Suggest a program' link below and tell us about it!