Videos
Shrink and convert clips for easy sharing.
Convert WebM to MP4
Turn WebM videos into widely-playable MP4 files on your device — for the phones, editors and apps that won't open WebM. Nothing is uploaded; choose MP4 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
- When should I convert WebM to MP4?
- WebM is a web-first format — great inside browsers, but frequently rejected by phones' galleries, video editors, messaging apps and upload forms. If a WebM file won't open or import where you need it, converting to MP4 fixes it, because MP4 is accepted almost everywhere.
- Will the file get bigger?
- Sometimes. WebM compresses efficiently, so an MP4 made from one can be a little larger at the same quality — that's the cost of universal compatibility. Keep the quality setting high if the picture matters more than the last few megabytes.
- Is anything uploaded?
- No — the conversion runs entirely in your browser with ffmpeg, so the video never leaves your device. Larger clips take longer because your own device does the work.
- Are my files uploaded to a server?
- No. Everything runs entirely in your browser — your files never leave your device.