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MP4 to WebM Converter

Convert MP4 videos to WebM for websites.

Picture and sound

Picture and sound are copied as they are when the new format allows it (fast, nothing lost). This converts only what older devices can’t play, such as Dolby Digital sound.

MP4, MOV and other videos, several at once

Drop more files anywhere on this page, or

    Runs on your device. No upload wait.

    What you get

    • For the web
    • Smaller files

    Questions

    Should I use WebM or MP4 on my website?

    Both play in every current browser. WebM (VP9) files are usually smaller for the same quality; MP4 (H.264) plays on more devices outside browsers. Many sites offer WebM first with MP4 as a fallback.

    Which browsers can make WebM here?

    Chrome, Edge and Firefox encode VP9. Safari’s support for encoding VP9 depends on the device; if it can’t, the page says so.

    How long does it take?

    Copying without re-encoding takes seconds, even for long videos. Re-encoding runs at roughly real time or faster on a recent computer, using its video hardware; phones are slower.

    Are my videos uploaded anywhere?

    No. Your videos are opened and processed on your device, and the results are saved straight back to it. Nothing is uploaded. How to check.

    Is it free? Do I need an account?

    It is free to use and there is nothing to sign up for. There are no watermarks and no daily limits.

    Missing something, or not working as it should? Tell us