What is the difference between WebM and MP4?
WebM is an open video format that Google introduced in 2010 for the web. It usually holds VP8, VP9 or AV1 video with Vorbis or Opus audio. Browsers play it well, and many screen recorders and web downloads produce it.
MP4 is the format almost every device understands. It usually holds H.264 video with AAC audio. Phones, smart TVs, game consoles and most editing programs open it without extra software, which is why people convert WebM to MP4 before sharing or editing.
How to convert WebM to MP4
- Drop your WebM file on the page, or choose it from your computer.
- In the Convert tab, keep MP4 as the output format.
- Press Start and wait for the progress bar to finish.
- Check the preview, then download your MP4.
Tips for a good result
Converting means encoding the video again, so a very small quality change is possible. Keep the original WebM until you have checked the MP4. If the file is meant for a chat or a social network, use the Compress tool afterwards to fit the size limit.
The first conversion can take a moment while the converter engine loads. Long or very large files need more time and memory, because everything runs on your own computer.
Questions
Is WebM to MP4 conversion free?
Yes. There is no sign up, no watermark added by this site and no daily limit.
Does my WebM file leave my computer?
No. The conversion happens in your browser, so the file is never sent to a server.
Will the sound be kept?
Yes. The audio is converted together with the video. If you only want the sound, use the MP4 to MP3 tool.