Upload a MP4 file and download a MKV. Free, no account, no watermark, and nothing is kept on our server.
Drag and drop a video file here
or
3GP · AVI · FLV · M4V · MKV · MOV · MP4 · MPEG · MPG · MTS · OGV · TS · WEBM · WMV · Maks 2 GB
Bundling several audio tracks, subtitles and chapters into one file.
MP4 is the format the world settled on. It is a container rather than a codec, almost always holding H.264 video and AAC audio, and there is no device, browser, editor or social platform that refuses it. If you are not sure what to convert something to, the answer is MP4.
Matroska is the most capable container there is: unlimited audio tracks, subtitles, chapters and any codec you like, all under an open licence. Its weakness is playback support - iPhones, iPads and most smart TVs will not touch it, which is why so many MKV files end up as MP4.
| MP4 | MKV | |
|---|---|---|
| Released | 2003 | 2002 |
| Developed by | MPEG | Matroska project (open) |
| Type | Container | Container |
| Usual codecs | H.264 or H.265 with AAC | Any, including H.265 and multiple tracks |
| File size | Small for the quality | Same as its codec |
| Best suited to | Everything, honestly | Films with subtitles and several audio tracks |
| Support | Universal | Good on desktop, poor on Apple and TVs |
The video is decoded and re-encoded, which costs a small amount of quality - invisible once, noticeable if you convert the same clip back and forth repeatedly. Resolution, frame rate and aspect ratio are preserved. Going from MP4 to MKV changes the wrapper and the codec, not the footage itself.
Video takes real time. A short clip finishes in under a minute, while a full-length film can take considerably longer, because every frame has to be decoded and encoded again. Uploading a large file is usually the slowest part of all.
Your file is uploaded to our server because the conversion runs there. A cleanup task runs every hour and deletes anything older than an hour, so nothing you upload survives more than about two hours. We do not open your files, we do not keep copies, and no account is needed to use the converter.