WEBM to MKV Converter - Free, Flexible Container
MKV can hold almost any video and audio codec in one flexible file. Upload your WEBM file and download the MKV result in seconds.
How to use WEBM → MKV
- 1Drag and drop your file, or click to select it.
- 2Click Convert to run WEBM → MKV.
- 3Download the result - your file is deleted automatically within 24 hours.
Drag & drop a file here, or click to browse
Your file is only processed temporarily for the conversion and is automatically deleted within 24 hours.
Frequently Asked Questions
Will the video quality change?
No - this is a lossless container remux (stream copy), not a re-encode, so video and audio quality stay exactly the same.
Is there a file size limit?
Yes - up to 200MB per file, which covers the vast majority of everyday video clips.