WebM recordings from screen recorders, browsers and downloads do not always play on older iPhones, Windows apps, video editors or social networks. Converting WebM to H.264 MP4 gives you the most compatible video file possible.
How to convert WebM (VP9) to MP4 (H.264)
- Drop your WebM (VP9) files in the box above, or click to pick them. You can add as many as you like.
- MP4 (H.264) is already selected as the output format. Switch on other formats if you want them too.
- Optional: open Advanced Settings to resize by percentage, width or height, and add more sizes.
- Click Start Conversion, then download each file or all of them at once. Nothing is uploaded: the conversion runs in your browser.
Why convert WebM (VP9) to MP4 (H.264)?
MP4 with H.264 is accepted by every platform and editing tool. The file may be a bit larger than the WebM, because H.264 is less efficient than VP9, but it will play anywhere.
Frequently asked questions
Why will my WebM not play?
Some apps and older Apple devices do not support WebM. MP4 with H.264 is universally supported.
Are my videos uploaded?
No. The video is decoded and encoded in your browser, on your device. Nothing is sent to a server, which also means there is no file size limit other than your device memory.
Can I resize the video while converting it?
Yes. Open Advanced Settings and turn on Resize to scale the video by percentage, width or height. You can add more sizes to get several versions in one go.