Plays everywhere
The MP4 has H.264 video and AAC sound, which phones, video editors and social sites accept.
WebM to MP4
Convert a WebM video to an MP4 that plays everywhere, in your browser. Your video is never uploaded.
- Free
- No account or install
- Your video is never uploaded
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WebM to MP4
Convert WebM to MP4, in your browser
Screen recorders and many websites save WebM, which some players and editors can't open. Drop it here for an MP4 that plays everywhere.
Trim while you convert
Set a start and an end to keep only the part you need.
Quality you choose
Pick a smaller file or a sharper picture, and see the size of the result before you download it.
Private by design
The conversion runs in your browser, so the video never leaves your computer.
How it works
Free here, more with the extension
This page works in your browser on any computer, with nothing to install and no account. The Pagewing extension adds what has to run on the page you're on.
In the Pagewing extension
The Pagewing extension records your screen as MP4 from the side panel, so there's nothing to convert.
On this page
Convert any WebM you have into an MP4, on any computer.
Questions about WebM to MP4
Something else? Write to us.
Is the WebM to MP4 converter free?
Yes. It works without an account and adds no watermark.
Is my video uploaded?
No. Everything happens in your browser, and the video never leaves your computer.
Why is it slower in some browsers?
Where the browser has an MP4 video encoder, as Chrome and Edge usually do, the conversion uses it and is quick. Elsewhere it uses a slower converter that downloads the first time (about 30 MB).
Can it convert other files?
It also reads MOV and MP4 files your browser can play, and always makes an MP4.