M4B to AAC Converter

Select files for conversion or just drag and drop them to the upload area

How to convert M4B files to AAC online?

Step 1.

Upload M4B-file

Click "Choose File" button to select a m4b file on your computer. M4B file size can be up to 50 Mb.
Step 2.

Convert M4B to AAC

Click "Convert" button to start conversion.
Step 3.

Download your AAC

Let the file convert and you can download your AAC file right afterwards.

Information about M4B and AAC file formats

Name M4B AAC
Full name MPEG-4 Audio Layer Bookmarkable File AAC - Advanced Audio Coding
File extension .m4b .aac
MIME type audio/m4b audio/aac
Developed by Apple Bell Labs, Fraunhofer Institute etc.
Type of format Music File Audio compression format
Description Audiobook and podcast files which also contain metadata including chapter markers, images, and hyperlinks can use the extension .m4a but more commonly use the .m4b extension. M4b files support metadata for chapters and bookmarking on supporting players and most commonly uses AAC (Advanced Audio Codec). Advanced Audio Coding (AAC) is an audio coding standard for lossy digital audio compression. Designed to be the successor of the MP3 format, AAC generally achieves better sound quality than MP3 at similar bit rates. AAC has been standardized by ISO and IEC, as part of the MPEG-2 and MPEG-4 specifications.
Technical details The audio in a M4b file is encoded with the AAC compression format and can therefore be protected with Apple's FairPlay DRM copy protection system. M4b files can contain metadata as defined by the format standard and in addition can contain Extensible Metadata Platform (XMP) metadata. AAC supports inclusion of 48 full-bandwidth audio channels in one stream plus 16 low frequency effects channels, up to 16 "coupling" or dialog channels, and up to 16 data streams. The quality for stereo is satisfactory to modest requirements at 96 kbit/s in joint stereo mode; however, hi-fi transparency demands data rates of at least 128 kbit/s.
Associated programs Apple QuickTime Player, Apple iTunes foobar2000, AIMP, DirectShow, QuickTime, VLC media player.
Wiki https://en.wikipedia.org/wiki/MPEG-4_Part_14 https://en.wikipedia.org/wiki/Advanced_Audio_Coding