WEBM to MKV
Convert WEBM files to MKV in seconds, for free. Nothing to install.
Files are deleted from the server automatically after 1 h.
Why convert WEBM 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 WEBM 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.
WEBM vs MKV: comparison
| Feature | WEBMWebM Video | MKVMatroska Video |
|---|---|---|
| Developer | Matroska | |
| Released | 2010 | 2002 |
| Type | video | video |
| Compression | lossy | lossy |
| Opens with | Chrome, Firefox, VLC | VLC, MPV, PotPlayer |
Tip: converting to 720p or 480p makes the file much smaller.
How it works
- Choose or drop your WEBM file.
- Pick MKV as the output format.
- Click “Convert” and download your file.
WEBM to MKV: questions and answers
Will quality be lost when converting WEBM 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 WEBM 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 WEBM file size?
Up to 500 MB per file and up to 20 files at once — for free.
Can I convert WEBM 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 WEBM →