MP4 to MKV converter
Repackage an MP4 as MKV without touching the picture or sound — it's fast and lossless.
How to use the mp4 to mkv converter
- Add your MP4 file.
- Keep MKV selected.
- Press Convert.
- Download the MKV file.
When it's useful
- Media players and TVs that prefer MKV
- Keeping all audio and subtitle tracks in one file
- Archiving videos
Limits to know
- The first conversion downloads a converter engine of about 31 MB; your browser keeps it afterwards.
- MP4 to MKV copies the streams as they are, so it is quick; other formats re-encode and are slower.
Your files
Processing happens in your browser. Your files stay on your device and are gone when you close the page.
Questions
Are my files uploaded?
No. The converter runs on your own device, so your file never leaves it.
Will the quality drop?
No. Converting MP4 to MKV here copies the video and audio exactly, without re-encoding.
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