MKV to WebM
Drop an MKV from OBS and other recorders and get a WebM file you can use where MKV won't open.
Your file stays on your device. Nothing is uploaded.
MKV to WebM in three steps
Drop your MKV
Up to 500 MB.
Convert
The file is re-encoded in your browser.
Download the WebM
Ready to play, edit or upload.
MKV vs WebM, in short
MKV (Matroska) is a flexible container that can hold several audio and subtitle tracks. OBS and other recorders use it because a recording survives a crash, but phones and many editors don't open it.
WebM is the web's open video format, usually with VP8 or VP9 video. Browsers, screen recorders and some download sites save it, but many editors and phones won't open it.
The video is re-encoded to VP8 video with Opus sound, which every browser plays. That runs on your own device, in the browser, so it takes a while for longer videos.
Frequently
Asked Questions
Does converting MKV to WebM lose quality?
It's re-encoded once, at good quality settings. Most people won't see a difference.
Is the sound kept?
Yes. The audio track comes along with the video.
How long does it take?
It depends on the length: re-encoding in the browser uses one processor core, so expect a minute or more per minute of video.
Is my file uploaded?
No. It's processed in your browser, on your own device, and never leaves it.