MP4 to WebM converter
Free, with no upload and no watermark. Your video is converted in this browser tab and never leaves your computer.
- No upload
- Uses your graphics card
- No watermark
This is a large file. The WebM is built in your computer's memory, so it may fail on a computer with little free memory.
Keep this tab open. You can switch to other tabs while it works.
Convert MP4 to WebM in three steps
No program to install and no account. It all happens in this page.
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1
Add your MP4
Drop the file on the box above, or click “Choose a file”. The page reads it from your computer.
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2
Pick the quality
“Balanced” suits most videos. Choose “Smaller file” for web pages that must load fast, “Best quality” for archiving.
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3
Download the WebM
Watch the result in the page, then save it. It plays in Chrome, Edge, Firefox, on web pages and in VLC.
Your video stays on your computer
Most online converters upload your file to their server. This one doesn't need to.
Nothing is uploaded
The page uses the video encoder built into your browser. Once it has loaded, it even works offline.
No waiting in a queue
No upload and no download of the result means a long screen recording converts as fast as your computer allows.
No limits
No sign-up, no watermark and no daily cap. Convert as many files as you like.
Questions, answered
Is this MP4 to WebM converter free?expand_more
Yes. There is no sign-up, no watermark and no limit on the number of files.
Is my video uploaded to a server?expand_more
No. The conversion runs inside your browser, on your computer. The file is never sent anywhere, and the page keeps working if you go offline after it has loaded. Read the privacy policy for details.
Which browsers does it work in?expand_more
Recent versions of Chrome, Edge and Opera, and Firefox 130 or newer. Safari can play WebM but may not be able to create it. The page uses the browser's built-in video encoder (WebCodecs).
Is there a file size limit?expand_more
There is no fixed limit. The finished WebM is held in your computer's memory until you download it, so files of a few gigabytes may fail on computers with little memory.
How do I record my screen straight to WebM?expand_more
Use PulseRecorder, the free screen recorder for Chrome and Edge. It records a tab, a window or your whole screen and saves it as WebM, MP4 or GIF. The export tutorial shows how, and the live demo lets you try it first.
Why convert MP4 to WebM?expand_more
WebM is an open, royalty-free format made for the web. With VP9 video it is often smaller than an H.264 MP4 at the same quality, and every modern browser plays it, which suits videos on web pages and in web apps. To go the other way, use the WebM to MP4 converter.
Record straight to WebM or MP4
PulseRecorder records your tab, window or screen and saves it as WebM, MP4 or GIF in one click. Free, no account.
Add to Chrome — Free