M4B Converter
DevConverter converts your audio files online. Amongst many others, we support MP3, M4A, WAV and WMA. You can use the options to control audio quality and file size.
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M4B
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M4B
M4B audio files are nearly identical to M4A files. They are usually encoded with the AAC codec. M4A files contain audio books and the file format supports chapters and bookmarking. These files is supported by iTunes or VLC.