Upload a MP4 file and download a WebM. Free, no account, no watermark, and nothing is kept on our server.
Drag and drop a video file here
or
3GP · AVI · FLV · M4V · MKV · MOV · MP4 · MPEG · MPG · MTS · OGV · TS · WEBM · WMV · Maks 2 GB
Putting video on a website, where WebM downloads faster and plays natively in the browser.
MP4 is the format the world settled on. It is a container rather than a codec, almost always holding H.264 video and AAC audio, and there is no device, browser, editor or social platform that refuses it. If you are not sure what to convert something to, the answer is MP4.
WebM was designed for the open web: royalty-free codecs, small files, and native playback in every modern browser. Outside the browser it is a nuisance - many editors and players still cannot open it.
| MP4 | WebM | |
|---|---|---|
| Released | 2003 | 2010 |
| Developed by | MPEG | |
| Type | Container | Container |
| Usual codecs | H.264 or H.265 with AAC | VP8, VP9 or AV1 with Opus |
| File size | Small for the quality | Small |
| Best suited to | Everything, honestly | Video on web pages |
| Support | Universal | Browsers yes, desktop apps often no |
Expect a noticeably smaller file at the same visible quality. The catch is outside the browser: many desktop players and most editing programs still cannot open WebM, so keep the original if the video is going anywhere but a web page.
Video takes real time. A short clip finishes in under a minute, while a full-length film can take considerably longer, because every frame has to be decoded and encoded again. Uploading a large file is usually the slowest part of all.
Your file is uploaded to our server because the conversion runs there. A cleanup task runs every hour and deletes anything older than an hour, so nothing you upload survives more than about two hours. We do not open your files, we do not keep copies, and no account is needed to use the converter.