Drop a WebM video and save it as MP4. When the video inside can simply be moved to the new file, it takes seconds; otherwise it is re-encoded with your device's hardware encoder. Free, with no upload and no watermark.
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Choose or drop your WebM video.
Press Convert. The progress bar shows how long is left.
Download your MP4 file.
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Not when the picture can be copied as it is (for example H.264 video from a MOV or MKV into MP4): then nothing is re-encoded. When it has to be re-encoded, a high quality setting is used.
No fixed limit. Very large files (several GB) need a computer with enough memory; in Chrome and Edge the result is written straight to a file you choose.
No. The video is read and processed by your own browser, with your computer or phone doing the work. Nothing is sent to our servers, so it is safe for private videos too.
Chrome, Edge, Opera and Brave (version 94 or newer), Safari 16.4 or newer, and Firefox 130 or newer, on a computer or a phone. A computer is much faster for long videos.