Free online video tool
MP4 to WebM
MP4 video becomes a WebM (VP8 and Opus) for websites and apps that prefer open formats.
PrivateRuns on your device
FreeNo account, no watermark
Limit250 MB per file
How it works
- 1Choose a MP4 file.
- 2Convert to WebM on your device.
- 3Download the WebM.
FAQ
How do I convert MP4 to WebM?
Drop the MP4 file on this page and select Convert. The WebM downloads when it is ready.
Are my files uploaded?
Files are processed in your browser with a local copy of FFmpeg. They are not uploaded to Super Media.
Is there a size limit?
Files up to 250 MB. Longer or high-resolution videos take longer because your own device does the work.