MP4 to WEBM Converter
Drop a file and get WEBM back in seconds. Nothing is uploaded: the conversion runs on your own device.
MP4: The most common video format. It plays on almost every phone, computer, TV and editing app.
WEBM: An open web format, used by browsers, screen recorders and many download sites.
The conversion runs inside your browser with WebCodecs, the video engine built into modern browsers. That is why there is no upload, no queue and no file size limit set by us: only your device's memory limits it. Your file stays private.
Planning an export for a platform? Work out bitrate and size with the file size calculator, and check what Reels and TikTok cover with the safe zone checker.
Converter engine: Mediabunny (MPL-2.0) on WebCodecs. MP3 encoding: LAME (LGPL).
How it works
- Drop your file Or tap to choose it. It is read on your device, nothing is uploaded.
- Pick the options If the tool has any, for example quality or target size.
- Save the result Click Convert, wait for 100 %, then Save file.
FAQ
Is my file uploaded?
No. The file is processed in your browser and never sent to our server.
Is there a file size limit?
We don't set one. Very large files need enough free memory on your device; a computer handles more than a phone.
Which browsers work?
Chrome and Edge on computers and Android work best. Safari works in recent versions. If your browser lacks a codec, the tool tells you.
Is it free?
Yes. No account, no watermark, no daily limit.