Convert WebM to MP4
Turn WebM files — browser screen recordings, downloaded clips — into MP4s that play everywhere.
Free · No signup · Files never leave your device
Drag and drop a video file
or click to browse
Compatible videos are repackaged in seconds without re-encoding — you'll see whether yours qualifies before converting.
How it works
Drop your WebM file
It stays on your device — nothing is uploaded.
Converted to MP4 locally
The video is converted right in your browser via WebAssembly. The tool tells you upfront whether it's an instant repackage or a re-encode.
Download the result
Preview the MP4 and download it — free, no watermark.
Frequently asked questions
It depends on the codecs inside your file. When they're compatible with MP4, the conversion is a near-instant repackage with no quality loss. When they're not, the video is re-encoded in your browser, which takes roughly the video's length. The tool shows you which case applies before you start.
If the video needs re-encoding, a small quality loss is unavoidable, but the converter uses a high-quality setting that is visually indistinguishable for most footage. Compatible streams are copied without any loss.
WebM files usually contain VP8/VP9 video, which the MP4 container does not accept, so the video has to be re-encoded to H.264. AV1 WebM files are the exception — AV1 fits in MP4, so those convert instantly.
Yes. The converter is completely free, with no signup, watermarks, or limits. We make money from our video translation service, not from this tool.
No. The conversion happens locally in your browser using WebAssembly. Your file never leaves your device — you can even disconnect from the internet once the page has loaded.