MP4 to WebM — Smaller Files for Faster Web Pages
WebM with VP9 compresses noticeably better than H.264 at the same visual quality, which makes it the right format for video you are embedding on your own site. Smaller files load faster, and page speed is a ranking factor as well as a user experience one.
When WebM is the better choice
This conversion runs opposite to the others here: you are not fixing compatibility, you are optimising delivery. For video you host and embed yourself, WebM can cut the transferred bytes substantially at equivalent quality. For video you are sending to someone or uploading to a platform, MP4 remains the safer format.
- Background and hero video on a landing page
- Short embedded loops that would otherwise be a heavy GIF
- Any self-hosted video where load time matters
Serve both, and let the browser choose
The robust approach is to offer both formats in a single HTML video element with two source tags, WebM first and MP4 second. Browsers pick the first format they support, so modern ones take the smaller WebM while anything older falls back to MP4 automatically.
How to convert MP4 to WebM
- Add your MP4 file. Open the converter and drop it in — nothing is uploaded.
- Select WebM. Choose it as the output format.
- Convert and download. The result saves straight to your device.
Frequently asked questions
Is WebM supported by all browsers?
Support is broad across current browsers. Providing an MP4 fallback in a second source tag covers everything else with no extra work.
How much smaller will the WebM be?
It varies with content and settings, but VP9 generally achieves meaningfully smaller files than H.264 at comparable quality.
Should I use WebM for videos I send to people?
No. Use MP4 for sharing and uploading. WebM is for video you host and embed yourself.