Convert WebM to MP4
Upload a WebM file and convert it to MP4. When the codecs already fit the target container, the conversion is lossless and near-instant; otherwise the video is re-encoded.
Upload a WebM file and convert it to MP4. When the codecs already fit the target container, the conversion is lossless and near-instant; otherwise the video is re-encoded.
WebM comes out of browser screen recorders and web downloads, and promptly hits walls: iPhones, TVs, and many editors want MP4. This tool converts locally, copying streams when the MP4 container accepts them and re-encoding to H.264/AAC-compatible form when it does not.
Record in the browser, convert to MP4 here, then share, upload, or edit anywhere. Because conversion is also in-browser, the whole pipeline runs without installing software or uploading sensitive captures.
Apple devices have historically lacked WebM support in apps and system players. MP4 sidesteps the issue completely.
Seconds when streams can be copied; for re-encodes, roughly proportional to video duration and resolution.
Yes, the conversion runs on your device only.