Decrease m4b volume

Download and install the latest version of Filestar.
Right click on one or more M4b file(s) on your desktop and select Convert with Filestar.
Type decrease volume in the search box.
Press Run.

What is .m4b?

Name: MPEG-4 Audio Book File
Extension: .m4b
Format: Binary
Category: Audio
Developer: Apple
Description: It is an audiobook file compressed using .AAC algorithm based on MPEG-4 container format. It is similar to .M4A file but its denoted as an audiobook and supporting audio players can bookmark it.
MIME Type: audio/x-m4a
Sample: sample.m4b
Wikipedia: .m4b on Wikipedia

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Last updated October 4, 2026