MP4 → WEBM
MP4 to WebM
WebM is an open video format designed for the web. Converting MP4 to WebM can reduce file size for modern browsers and improve page loading, especially for background videos and product demos.
The file will be deleted from the server automatically.
How to convert MP4 to WEBM
- 1Upload an MP4 video
- 2Wait for the conversion to WebM
- 3Download the WebM and use it on your website
More about MP4 to WEBM
Why convert MP4 to WebM
WebM is an open container designed for the web, usually with VP9 or AV1 video and Opus audio. It often produces smaller files than MP4 at comparable quality, which makes it useful for landing pages, product demos and background videos.
How it works
The file is uploaded to an isolated queue and processed by ffmpeg. Video is encoded to VP9 with realtime deadline settings, audio to Opus. Progress is shown on the page, and the result is deleted after download or within an hour.
What to know
WebM is supported by modern browsers, but Safari and older devices may require an MP4 fallback. For a website, provide both formats and let the browser choose. The maximum file size is 100 MB, duration is five minutes and resolution is Full HD.
Questions and answers
Why use WebM on a website?
WebM with VP9 often produces smaller files than MP4 at similar quality, which helps pages load faster and reduces bandwidth.
Do all browsers support WebM?
Modern versions of Chrome, Firefox and Edge support WebM. Safari support depends on the version, so keep an MP4 fallback for older browsers.
Is audio preserved?
Yes, the audio track is encoded to Opus.
What are the limits?
Up to 100 MB, 5 minutes and Full HD resolution.