Audio Format

What is a .M4B File?

MPEG-4 Audiobook (.m4b) - Specifications, details, and free conversion tools.

Technical Details & Specifications

Format Name:

MPEG-4 Audiobook

File Extension:

.m4b

Category:

Audio

MIME Type:

audio/mp4

Specialized audiobook audio format supporting chapter markers and bookmarking on iOS.

How to Open .M4B Files

Files with the .m4b extension can typically be opened using modern web browsers, media players, or native system viewers. If your operating system cannot open this file, you can convert it to a universal format like MP4, MP3, JPG, or PDF using SnapConvert without installing additional software.