Tool 09
WebM → MP4
Video transcoding in the browser is slower than desktop — expect roughly 2–3× the clip length. For files over ~200MB, a desktop tool will be faster.
Drop WebM files to convert
up to ~200MB per file · 0 bytes uploaded to our servers
How do I convert a WebM video to MP4 online?
Drop your WebM file onto the box. We transcode the VP8/VP9 video into H.264 MP4 in your browser using FFmpeg compiled to WebAssembly. It takes a while — browser transcoding is slower than desktop — but nothing uploads.