MP4 to MKV
Convert MP4 files to MKV in seconds, for free. Nothing to install.
Files are deleted from the server automatically after 1 h.
Why convert MP4 to MKV?
- MKV can hold several audio tracks and subtitles in one file — perfect for films and series.
- Convert in a few seconds right in your browser, without installing software.
You don't need to install any software to convert MP4 to MKV. Upload your file, choose MKV and download the result a few seconds later. The conversion runs on our servers and your file is deleted automatically after 1 h.
MP4 vs MKV: comparison
| Feature | MP4MPEG-4 Video | MKVMatroska Video |
|---|---|---|
| Developer | MPEG (ISO) | Matroska |
| Released | 2001 | 2002 |
| Type | video | video |
| Compression | lossy | lossy |
| Opens with | VLC, Windows Media Player, QuickTime | VLC, MPV, PotPlayer |
Tip: converting to 720p or 480p makes the file much smaller.
How it works
- Choose or drop your MP4 file.
- Pick MKV as the output format.
- Click “Convert” and download your file.
MP4 to MKV: questions and answers
Will quality be lost when converting MP4 to MKV?
MKV uses compression, but at the default settings the difference is hard to hear or see. You can choose a higher bitrate in Options.
How long does MP4 to MKV conversion take?
It depends on the length: a short file takes a few seconds, a long video can take a few minutes. Progress is shown as a percentage.
What is the maximum MP4 file size?
Up to 500 MB per file and up to 20 files at once — for free.
Can I convert MP4 to MKV on my phone?
Yes. TezConvert works in any browser on Android and iPhone — no app needed.
How do I open a MKV file?
MKV files open in: VLC, MPV, PotPlayer.
Are my files safe?
Files are used only for the conversion, never shown to anyone, and deleted automatically after 1 h. The original is deleted right after conversion.
⇄ Need the opposite? Convert MKV to MP4 →