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Good for exactly this
The upload that keeps rejecting your MP4, the app that only opens WebM, and the person who asked for WebM by name.
← All the free tools
↗MP4 → WebM
Convert MP4 to WebM online
Turn an MP4 into a WebM right here in your browser. Free, nothing to install, no account to make, and no watermark on what you download.
✓ Free, actually free✓ No account needed✓ Nothing kept afterwards
Use it now ↓↗
MP4 → WebM
Free · no signup · no watermark
video→webm
or just drag it in here
Your file is deleted after the job · download expires in 24 hours · no watermark
01Choose your fileDrag your video in, or pick it from your files.
02Press the buttonLeave this page open while it works — it is usually quick.
03It is yoursDownload the WEBM any time in the next 24 hours.
Why bother with this page
Because it does the one thing you came for.
You need WebM because something on the other end insists on it — an upload form, an app, a client. WebM gives you lean web video that can keep a transparent background, and this page hands it over in one step.
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No nasty surprises
Nothing is cropped, squashed or scaled — the result comes back at the size you sent in. Worth knowing: some older apps and editors refuse WebM even when your browser plays it happily.
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Nobody else sees it
Your upload is deleted the moment the job finishes. The result is private to you, disappears by itself after 24 hours, and you can wipe it sooner with one click.
Before you ask
MP4 → WebM, answered
01Do I need to install anything to convert MP4 to WebM?＋
No. It all happens on this page: choose your file, give it a moment, and the finished WebM lands in your downloads.
02Will the WebM look or sound better than the original?＋
Converting changes what your file is compatible with, not how much detail it holds. Nothing can put back what an earlier compression already threw away, so always start from the best copy you have.
03Is there a watermark, a signup or a file cap?＋
None of the three. Your upload is deleted the moment the job finishes, your download stays available for 24 hours, and you can wipe it sooner with one click.
While you are here
People usually need one of these next
JPG → PNG→
Convert JPG to PNG online
JPEG → PNG→
Convert JPEG to PNG online
PNG → JPG→
Convert PNG to JPG online
WebP → PNG→
Convert WebP to PNG online
Or make something bigger
This file could be a whole video.
Cut it, layer it, caption it, put a voice on it and export an MP4 — free, in the same browser tab. Start the editor with your original footage.