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WebM to MP4 Converter

WebM is common on the web and in screen recorders, but many apps only take MP4.

Runs in your browser · No uploads

Drag & drop a WebM video here

or

WebM videos, e.g. from screen recorders and websites · converted to MP4

Your files stay on your device. Nothing is uploaded.

  • Nothing leaves your device
  • No server-imposed size limits
  • No sign-up, no watermark
  • Free

How to convert WebM to MP4

  1. Choose your WebM video.
  2. The output is set to MP4; choose the quality used if the video has to be re-encoded.
  3. Press Convert and download the MP4 file.

Good to know

  • WebM usually contains VP8, VP9 or AV1 video, which is re-encoded to H.264 for the widest support.
  • When the video and sound can be copied into the new format as they are, they are not re-encoded: no quality loss, and very fast.
  • Best in current Chrome and Edge; recent Safari and Firefox work too.

Your videos stay on your device

Everything happens in your browser. Your videos are never uploaded, and this site's security policy blocks the page from sending files anywhere.

Frequently asked questions

Is there a size limit?

No server-imposed file size limits. The practical limit is your device's memory: several gigabytes work on most computers.

Are my videos uploaded?

No. They are converted in your browser and never sent anywhere.