Convert MP4 to WebM
Turn MP4 videos into WebM on your device — smaller files for faster-loading web pages. Nothing is uploaded; choose WebM and download.
Drop a video here
or click to choose · MP4, MOV, WebM, MKV…
Need more control? Open the full convert video tool.
Frequently asked questions
- Is WebM smaller than MP4?
- Often yes at similar quality, which makes web pages load faster — though playback support is best in modern browsers.
- Will I lose quality?
- Re-encoding can change detail slightly. Use a higher quality setting to stay close to the original.
- Are my files uploaded to a server?
- No. Everything runs entirely in your browser — your files never leave your device.