Convert WebM to MP4 Online Free
Drop a WebM file below to convert it to MP4 — entirely in your browser. Nothing is uploaded.
Drop a WebM file here
or click to browse — up to 2GB, processed on your device
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Nothing uploaded, ever. Your WebM is decoded and re-encoded to MP4 locally, inside this browser tab.
Why convert WebM to MP4?
WebM is an open, web-friendly video format often produced by screen recorders, browser-based recording tools, and some video downloaders. It plays fine in most modern browsers, but support drops off in traditional video editors, older smart TVs, and some mobile apps. Converting to MP4 gives you a file that opens cleanly in virtually any editor or device.
- Import a screen recording into a video editor that doesn't support WebM
- Play a downloaded WebM clip on a smart TV or older device
- Share a browser-recorded video with someone whose app expects MP4
Since the whole process happens on your device, there's no upload delay and no privacy concern — even screen recordings with sensitive content stay local.
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Frequently asked questions
WebM is commonly produced by screen recorders, browser-based recording tools, and some video downloaders, since it's an open format built for the web. It's great for websites but less supported in video editors and older devices. See our guide to the best video format for the web.
There is a small amount of re-encoding loss, as with any format conversion, but at a matched bitrate it's generally not noticeable.
No. Conversion runs entirely in your browser on your own device. The file is never uploaded to a server. See our Privacy Policy.