MKV to WebM converter
Convert MKV (Matroska container, often used for high-quality video) into WebM, which smaller files tuned for fast web playback. Everything happens locally in your browser — no uploads, no servers, and no waiting in a queue.
MKV to WebM — common questions
Is the MKV to WebM converter free?
Yes — it's completely free, with no sign-up, no watermark, and no limit on how many files you convert.
Are my MKV files uploaded to a server?
No. The conversion runs entirely in your browser, so your MKV file never leaves your device and is never uploaded.
How do I convert MKV to WebM?
Drop your MKV file into the tool above, then click the convert button. The WebM file is generated locally and ready to download in moments.
Will I lose quality converting MKV to WebM?
Quality is preserved as closely as the WebM format allows. For most web video the result is visually identical to the source.
Does this work on mobile?
Yes — it runs in any modern browser on desktop or mobile, with nothing to install.