How do I convert Matroska (MKV) to WebM?

Upload your Matroska (MKV) file using the box above, confirm WebM as the output format, then select Convert. The converted file is ready to download as soon as processing finishes — usually in a few seconds.

Is converting MKV to WEBM free?

Yes, and there is nothing to sign up for. Every conversion is free, there is no paid tier, and the limits are the same for everyone.

Will the quality change when converting to WebM?

WEBM uses lossy compression, so some data is discarded to keep the file small. The default quality setting is tuned to be visually or audibly transparent for most material, and you can raise it in the conversion settings.

What happens to my file afterwards?

The uploaded file is deleted as soon as the conversion completes, and the converted file is removed automatically once its retention window ends. Download links are signed and expire within minutes.

mkvwebm

Convert Matroska (MKV) to WebM

Free online converter for Matroska (MKV) files. Open, royalty-free format optimised for the web. Nothing to install, no watermark, and every file is deleted automatically.

Drag and drop your files

Upload a Matroska (MKV) file to convert it to WebM. Up to 200 files at once, 10 GB each.

Free · up to 200 files · 10 GB each · files deleted automatically after 168 hours.

About MKV and WEBM

Matroska (MKV)

Flexible container for high-quality video.

video/x-matroska

WebM

Open, royalty-free format optimised for the web.

video/webm

Other Matroska (MKV) conversions

mkv to mp4
mkv to mov
mkv to avi
mkv to gif
mkv to mp3
mkv to wav
mkv to flac
mkv to ogg

Other ways to get WebM

mp4 to webm
mov to webm
avi to webm
gif to webm