How to use it
- Drop your WebM files into the box above or click “Choose files”.
- Adjust the options if you need to.
- Click “Convert to MP4” and download the result.
About the format
WebM uses VP8/VP9 video that many apps, Apple devices and editors don’t support. The converter re-encodes it to H.264 MP4, the most compatible video format.
Frequently asked questions
Why is the first conversion slower?
The video engine (about 30 MB) is downloaded once and then cached by your browser. Processing speed depends on your device, because everything happens locally.
Is there a file size limit?
There is no fixed limit, but browsers have memory limits. Files up to a few hundred MB work well on most computers.
Is it free?
Yes. All tools on ConvertNest are free to use, with no sign-up, limits on the number of files or watermarks.
Are my files uploaded anywhere?
No. The conversion runs entirely in your browser, on your own device. Your files are never sent to our server, which also makes it fast and safe for private documents.
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