Convert MKV to WebM
Free, fast MKV-to-WebM conversion.
Video and audio are processed with ffmpeg in your browser — large files are slow and use a lot of memory. Keep files under a few hundred MB for best results.
About the MKV and WebM formats
MKV. Matroska (MKV) is a flexible open container holding video, audio and subtitles.
WebM. WebM is an open, royalty-free video format optimised for the web.
Frequently asked questions
How do I convert MKV to WebM?
Drop your MKV files into the box above and click Convert. The WebM file is generated instantly and ready to download.
Will the quality stay the same?
WebM keeps full quality, so your converted file looks identical to the original.
Is MKV to WebM conversion free?
Completely free, with no sign-up, watermarks or file-size paywalls.