OctoolyWhy convert WebM to MP4?
Screen recordings and videos saved from the browser often come as WebM. Turning them into MP4 lets you open them on an iPhone, in PowerPoint, in Premiere or in any other editor.
How to convert WebM to MP4
- Drop your WebM file in the box above, or click to choose it.
- Check the options and click the button. Your browser does the conversion.
- Download your MP4. Nothing was uploaded.
What is WebM?
WebM is the open video format of the web (VP8, VP9 or AV1 video with Opus audio). Browsers handle it well, but iPhones, PowerPoint and many editors don't.
What is MP4?
MP4 with H.264 video and AAC audio is the most compatible video format there is. It plays on phones, TVs, browsers, WhatsApp, Instagram and every video editor.
Frequently asked questions
Is it really free?
Yes. No sign-up, no watermark and no limit on how many files you convert. The site is paid for by ads.
Is my video uploaded anywhere?
No. The conversion runs inside your browser, on your own computer. The file never leaves your device, not even to our servers.
Is there a file size limit?
There is no upload limit, because nothing is uploaded. Very large files (several GB) depend on your computer's memory.
Will I lose quality?
When the video is already H.264, it is copied without re-encoding, so nothing is lost. Otherwise it is re-encoded; keep Quality on High for the best result.
Which browsers work?
Google Chrome and Microsoft Edge on a computer work best. They have the video encoders the converter needs.