WebM is the royalty-free video format designed for the web, and VP9 inside it often makes smaller files than H.264 at the same quality. Developers commonly serve a WebM source with an MP4 fallback in an HTML5 video element. This page re-encodes MP4s to VP9 video and Opus audio directly in your browser.
When to use this
Good for: adding a WebM source to an HTML5 video tag, hero and background videos on a website, product demos for a landing page, short clips for web apps, and any project that needs an open, royalty-free format.
Frequently Asked Questions
Should I use WebM or MP4 on my website?
Both: list a WebM source first and an MP4 second inside the video element. Browsers that play WebM use the smaller file and the rest fall back to MP4. Every current browser, including Safari, plays WebM.
Which codecs does the WebM use?
VP9 video and Opus audio, the standard WebM combination supported by Chrome, Edge, Firefox and Safari.
Why is it slower than MOV to MP4?
H.264 can't go into WebM, so every frame is re-encoded to VP9. Expect it to take roughly as long as the video plays, depending on your device.
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