Convert MPEG-2 Transport Stream (.m2ts) to Matroska Video (.mkv) online for free. Fast, secure video conversion with no watermarks or registration.
Conversion settings — add a file to adjust
Upload your .m2ts file by dragging it into the upload area or clicking to browse.
Choose your output settings. The default settings work great for most files.
Click Convert and download your .mkv file when it's ready.
M2TS is the MPEG-2 Transport Stream container used by Blu-ray discs and AVCHD cameras, designed for broadcast-style sequential reading with 192-byte packets (4 extra timing bytes per packet). MKV (Matroska Video) is the open-source, feature-rich container that is the de facto standard for high-quality video archiving and media server libraries. Converting M2TS to MKV is the standard first step in Blu-ray archiving — it strips the transport stream overhead while preserving every audio track, subtitle, and chapter marker.
MKV is the universal container for Blu-ray archiving because it supports everything M2TS does (multiple audio tracks, subtitle streams, chapter markers) while being more space-efficient, better supported by media players, and more flexible for adding metadata. Plex, Jellyfin, Emby, and Kodi all prefer MKV for their libraries. MKV also avoids the stream synchronization issues that sometimes plague M2TS playback on desktop software.
FFmpeg (or mkvmerge from the MKVToolNix suite) remuxes the M2TS content into Matroska format. Since MKV natively supports H.264, H.265, AC3, DTS, DTS-HD MA, TrueHD, and PGS subtitles, the conversion is typically a pure remux — no re-encoding needed. The 4-byte extra timestamp in each M2TS packet is stripped, and Matroska's cluster-based timing takes over. All audio tracks, subtitle streams, and Blu-ray chapter markers can be preserved. The resulting file is typically 1-2% smaller than the M2TS due to the more efficient container overhead.
When remuxing (the default and recommended operation), quality is bit-identical to the source. Not a single pixel or audio sample is modified — only the container changes. This makes M2TS to MKV the perfect quality-preserving conversion.
| Device | M2TS | MKV |
|---|---|---|
| Windows PC | Partial | Partial |
| macOS | Partial | Partial |
| iPhone/iPad | Partial | Partial |
| Android | Partial | Partial |
| Linux | Partial | Partial |
| Web Browser | No |
Resolution: 1920x1080
Bitrate: 8-12 Mbps
H.264 recommended for fast processing
Resolution: 1080x1080
Bitrate: 3.5 Mbps
Square or 9:16 for Reels
Resolution: 1080x1920
Bitrate: 4 Mbps
9:16 vertical, under 60s ideal
Resolution: 1280x720
Bitrate: 5 Mbps
Under 140s, 512MB max
Resolution: 960x540
Bitrate: 2 Mbps
16MB limit for standard, 64MB for document
Resolution: 1280x720
Bitrate: 4 Mbps
M2TS to MKV remuxing is the standard archival conversion for Blu-ray and AVCHD content. It preserves perfect quality while improving compatibility with media servers and software players. Every serious media collector uses MKV.
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| Funktion | M2TS | MKV |
|---|---|---|
| Fulde navn | Blu-ray BDAV MPEG-2 Transport Stream | Matroska Video |
| Filendelse | .m2ts | .mkv |
| Bedst til | Blu-ray format | Multiple audio tracks |