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.

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