Convert MP4 to WebM
100% private — runs on your device, never uploaded. Works offline once loaded.
WebM exists for the open web: royalty-free codecs, native support in Chrome and Firefox, and a format you can self-host without worrying about patent licensing the way H.264 in MP4 technically requires. It is the right choice for a background video on a site, a short loop in a web app, or anywhere you want a second source alongside MP4 in a video tag. The conversion is a genuine re-encode — VP8 video and Vorbis audio are nothing like what an MP4 holds — so it takes real time and costs a generation of quality. Safari support for WebM is recent enough that keeping the MP4 around as a fallback is still the sensible thing to do.
Frequently asked questions
Should I use WebM or MP4 on my site?
Offer both in a video tag if you can: WebM first for browsers that take it, MP4 as the fallback for everything else.
Why is the WebM sometimes bigger?
VP8 at a fixed bitrate is not always smaller than a well-encoded H.264 file. Drop the quality level if the size matters more than the detail.
Is my video uploaded?
No — it is converted on your device.
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