Convert M4B to MKV — Free Online Converter
Convert MPEG-4 Audiobook (.m4b) to Matroska Video (.mkv) online for free. Fast, secure audio conversion with no watermarks or registration.
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About M4B to MKV Conversion
MKV (Matroska Video) is an open container that supports virtually every codec, including AAC audio from M4B. Converting M4B to MKV packages audiobook content in Matroska's versatile container, which natively supports chapter markers — a feature that aligns perfectly with M4B's audiobook chapters. Unlike converting to M4A or MP3, an MKV conversion can preserve the audiobook's chapter structure in Matroska's chapter specification.
Why Convert M4B to MKV?
MKV is one of the few formats besides M4B that supports rich chapter metadata. Media servers like Plex and Jellyfin display MKV chapters in their player UI. If you want to move audiobooks out of Apple's ecosystem while preserving chapter navigation, MKV is an excellent target. MKV also supports multiple audio tracks, external subtitle files, and embedded cover art — useful for enhanced audiobook experiences.
Common Use Cases
- Archiving audiobooks in an open format that preserves chapter markers
- Adding audiobook content to Plex or Jellyfin media servers with chapter navigation
- Combining audiobook audio with subtitle tracks (for accessibility) in a single MKV