Convert M4A to MKV — Free Online Converter
Convert MPEG-4 Audio (.m4a) to Matroska Video (.mkv) online for free. Fast, secure audio conversion with no watermarks or registration.
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About M4A to MKV Conversion
MKV (Matroska Video) is a versatile open container that supports virtually every audio and video codec. Converting M4A to MKV packages the audio inside a Matroska container, which is useful for combining audio with video tracks, adding subtitle streams, or preparing audio for media server libraries (Plex, Jellyfin, Kodi) that organize content in MKV format. The AAC audio from M4A can be stream-copied directly into MKV without re-encoding.
Why Convert M4A to MKV?
MKV supports multiple audio tracks, chapter markers, attachments, and metadata in ways that M4A does not. If you need to combine M4A audio with a video track, subtitles, or additional audio tracks (commentary, different languages), MKV is the standard container. Media server software like Plex indexes MKV files with their full track metadata, making MKV the preferred format for organized media libraries.
Common Use Cases
- Muxing M4A audio commentary alongside video in an MKV container
- Adding M4A music tracks as audio streams in MKV video files for Plex or Jellyfin
- Combining multiple M4A files (different languages) into a single MKV with selectable audio