Convert MP4 to WebM
Makes a WebM video for your website or web app, right in your browser.
- 100% in your browser
- No upload
- No sign-up needed
- No watermark
How to convert MP4 to WebM
- Add your video
Drop an MP4, MOV or other video on the box above. Nothing is uploaded. - Convert to WebM
The picture is encoded as VP9 and the sound as Opus, the formats WebM uses. - Download the WebM
Use it in an HTML5 <video> tag or anywhere WebM is needed.
Features
- No uploadProcessing happens on your device with WebCodecs, so even large files stay private.
- No sign-up needed, no watermarkUse every tool as often as you like. Your output is clean.
- Hardware acceleratedUses your device’s video encoder when available, so most jobs finish in seconds.
- Works on phone and desktopRuns in Chrome, Edge, Safari and Firefox on iPhone, Android, Windows and Mac.
Frequently asked questions
Are my files uploaded?
No. The file is read and processed by your browser. It never leaves your device.
Is it free?
Yes. There is no file limit and no watermark, and you don’t need an account.
Related tools
- WebM to MP4WebM uses VP8/VP9/AV1 video, so it is re-encoded to H.264 for maximum compatibility.
- Video ConverterPick the format you need. When the codecs already fit, the video is repackaged instantly with no quality loss.
- Video CompressorPick a target size and the compressor works out the bitrate and resolution for you.