It's open, royalty-free, and well supported by modern browsers.

Video to WebM

Convert any video to the open WebM (VP9) format.

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About Video to WebM

Convert MP4, MOV and more to VP9 WebM — an open, web-friendly format with great compression. Runs privately in your browser.

Open the Video to WebM tool and add your file — it's processed in your browser, never uploaded.
Adjust the available options to get the result you want.
Download the result. There's no sign-up, no watermark, and no size cap.

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Convert WebM videos to universally-compatible MP4.