Compress WebM
Drop a WebM and get a much smaller MP4, at the quality and resolution you pick.
Your file stays on your device. Nothing is uploaded.
Compress WebM in three steps
Drop your WebM
Up to 500 MB.
Pick quality and resolution
Balanced at 720p is a good start.
Compress and download
You get an MP4 that's a fraction of the size.
Why the result is an MP4
WebM is the web's open video format, usually with VP8 or VP9 video. Browsers, screen recorders and some download sites save it, but many editors and phones won't open it.
Compressing means re-encoding, so the tool saves the result as an H.264 MP4: it compresses well and plays everywhere, including the apps that won't open a WebM. Sound is saved as 128 kbps AAC.
Resolution makes the biggest difference: going from 1080p to 720p cuts the pixels by more than half, and on a phone screen it looks the same. Then pick Balanced, or Smallest file for hard limits like email.
Frequently
Asked Questions
Why do I get an MP4 back?
MP4 compresses well and plays everywhere, so it's the most useful result.
How much smaller will it get?
Often 70 to 90 percent smaller at 720p Balanced, depending on the source.
Is my file uploaded?
No. It's processed in your browser, on your own device, and never leaves it.