MotionShine01 / Drop
Choose a WebM
Drag in the file. It is read from your own disk.
Free tool
WebM to MP4 converter.
Turn a WebM video, such as a browser screen recording, into an H.264 MP4 that QuickTime, phones, editors and websites accept. It runs in your browser, so nothing is uploaded.
This runs in your browser. Your files are never uploaded.
How it works
Three steps, nothing to install.
02 / Wait
It is converted
The picture and sound are re-encoded as H.264 and AAC, the kind of MP4 every player opens.
03 / Save
Download the MP4
Play it in the page, then download it.
Questions
Good to know.
Is my video uploaded?
No. It is converted in this tab with your browser, so the file never leaves your computer.
Does it lower the quality?
The video is re-encoded as H.264 with AAC sound, so there is a small loss, as with any re-encode. That is what makes the MP4 play in QuickTime, on iPhones and in editors.
Will every player open the MP4?
Yes. H.264 video with AAC sound is the most widely supported kind of MP4.
Where do WebM files come from?
Browser screen recorders, including our online screen recorder in some browsers, and many video downloads save WebM.
Is there a size limit?
The file is handled in your browser's memory, so very large files can fail. Close other tabs and try again, or cut the video first with the video trimmer.
Which browsers work?
Current Chrome, Edge and Safari, which can encode H.264 video.