Convert MP4 to WebM
Convert MP4 videos to WebM directly in your browser. WebM uses VP9 encoding — smaller files than H.264 with the same visual quality, and it plays natively in all modern browsers without needing MP4 codec licenses.
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How it works
- Drop a
.mp4file (or any video) onto the page. - The WebM output preset is already selected — hit Convert Now.
- Download the result. The whole conversion ran in your browser via WebCodecs or FFmpeg.wasm. No file left your device.
Why convert MP4 to WebM?
Convert MP4 videos to WebM directly in your browser. WebM uses VP9 encoding — smaller files than H.264 with the same visual quality, and it plays natively in all modern browsers without needing MP4 codec licenses.
Is my file uploaded anywhere?
No. poqpoq is a static site — the page you're looking at is a bunch of JavaScript your browser downloaded once. It runs entirely on your device. There is no upload endpoint. When you open your browser's Network tab during a conversion, you'll see zero requests going out.