MKV is the Matroska container, popular for films and recordings because it can hold several audio and subtitle tracks. Phones and editors often can’t open it. WebM is an open video format designed for the web, common for screen recordings and browser downloads. Apple devices and many editors handle it poorly.
Converting to WebM gives you an efficient, open video format for websites. The conversion happens entirely in your browser, so your files are never uploaded and there’s no size limit beyond your device’s memory.
How to convert MKV to WebM
- Choose your MKV file.
- Optionally pick a smaller video size, and set a start and end time if you only need part of it.
- Press Convert and download the WebM.
Questions
Is MKV to WebM conversion free?
Yes, completely free with no limits, sign-up or watermark.
Are my files uploaded?
No. Conversion runs on your own device, so your files stay private.