Online M4B audio converter

Upload single or multiple files to convert into M4B format with .m4b extension.

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    M4B: M4B Audio is stored in MPEG-4 and compressed by using AAC encoding. An M4B file is very similar to M4A but having support the audiobook related features, such as bookmarking and chapter breaks. M4b has better than MP3 in terms of quality or even smaller file size if encode both at the same bit rate. The file with .m4b extension is an audiobook generally used by Apple books and iTunes.