MP4 to WebM Converter
Convert MP4 video to WebM in your browser — no upload, no watermark.
To convert MP4 to WebM, drop your video in and choose a quality. The conversion runs through FFmpeg compiled to WebAssembly inside your browser, so the file is never uploaded and there is no size cap beyond your available memory. WebM with VP9 produces noticeably smaller files than H.264 at the same quality and is royalty-free, but a few older devices and editors will not open it.
Runs in your browserAbout converting MP4 to WEBM
WebM with VP9 produces noticeably smaller files than H.264 at the same quality and is royalty-free, but a few older devices and editors will not open it. Because the encode happens on your own machine, expect roughly real-time speed for 1080p — a five-minute clip takes about five minutes. That is the trade for not uploading it.