WebM to MP4 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 MP4 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 WebM to MP4 in three steps
No program to install and no account. It all happens in this page.
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1
Add your WebM
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 email and chat, “Best quality” for editing.
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3
Download the MP4
Watch the result in the page, then save it. It plays on phones, in QuickTime, Windows and video editors.
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 WebM to MP4 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, Opera and Safari, and Firefox 130 or newer. It uses the browser's built-in video encoder (WebCodecs).
Is there a file size limit?expand_more
There is no fixed limit. The finished MP4 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 MP4?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 MP4, GIF or WebM. The export tutorial shows how, and the live demo lets you try it first.
Why convert WebM to MP4?expand_more
WebM is the format browsers record in, but many phones, editors, social sites and QuickTime expect MP4. MP4 with H.264 video and AAC audio plays almost everywhere. To go the other way, use the MP4 to WebM converter.
Skip the conversion next time
PulseRecorder records your tab, window or screen and saves it as MP4 or GIF in one click. Free, no account.
Add to Chrome — Free