FREE CONVERTER · ON YOUR DEVICE
Convert WebM to MP4
Add your WebM file below and press the button: Cocuyo converts it to MP4 right in your browser, for free and with no watermark. MP4 is already selected as the output. A social network, an editor or a phone will not accept your WebM and asks for MP4.
- Free, no watermark
- Your files never leave your device
- MP4 pre-selected
It is saved as MP4 (H.264 with AAC sound) if your browser can create it: Chrome and Edge on Windows, Mac and Android, and Safari. If it cannot, you will see the MP4 option turned off and why; it is never saved in a different format from the one you choose.
HOW TO DO IT
Three steps.
Add your WebM file
Drop it on the box or choose it. Up to 10 videos at once, up to 300 MB and 10 minutes each; output up to 1080p.
Check the quality
High quality and the original resolution (up to 1080p) are already selected; lower the quality if you want a smaller file.
Download the MP4
Press the button and download each file, or all of them in a ZIP when there are several.
FORMATS
WebM vs MP4: what changes
A social network, an editor or a phone will not accept your WebM and asks for MP4. It is re-encoded at high quality without changing the resolution (up to 1080p) and keeps the sound.
| Feature | WebM | MP4 |
|---|---|---|
| What it is | Open video container (VP8, VP9 or AV1 with Opus audio). | Video container, usually H.264 with AAC audio. |
| Compression | Lossy and efficient. | Lossy and very efficient. |
| Transparency, animation or sound | Video and sound. | Video and sound. |
| Compatibility | Browsers; many networks, older phones and editors do not accept it. | The most compatible: phones, social networks and TVs. |
| Best for | Video on websites and recordings made in the browser. | Sharing and posting video. |
WebM to MP4: common questions
Does converting WebM to MP4 lose quality?
It is re-encoded at high quality without changing the resolution (up to 1080p) and keeps the sound.
How many files can I convert at once?
Up to 10 videos at once, up to 300 MB and 10 minutes each; output up to 1080p.
Does it work in every browser?
It is saved as MP4 (H.264 with AAC sound) if your browser can create it: Chrome and Edge on Windows, Mac and Android, and Safari. If it cannot, you will see the MP4 option turned off and why; it is never saved in a different format from the one you choose.
Are my files uploaded to a server?
No. The conversion happens inside your browser: the file is read and processed on your device and is not sent to Cocuyo or to any third party. You can check it in your browser’s network tools: your file is not sent.
Is it really free?
Yes. You can try it before signing up; to download the result we ask for a free account, with no subscription. Your free account comes with 30 welcome uses; after that, each use costs 1 credit (top-ups from US$1), and they are unlimited with Basic or Pro. It never adds a watermark.
Learn how to…
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