MP4 to WebM

Convert MP4 videos to WebM. Large videos can take a few minutes.

This tool re-encodes an MP4 video into WebM, an open, royalty-free format commonly used for fast-loading web video and HTML5 players. Files up to 100MB are supported; conversion can take a few minutes for longer clips.

Drop your MP4 file here

Upload files

Size up to 100 MB

How do I use MP4 to WebM?

1
Upload your MP4 file: drag it into the drop zone or click to browse. Files up to 100MB work.
2
Click Convert to WebM. Longer videos can take a few minutes to convert.
3
Download the WebM file for embedding on a website or using in HTML5 video players.

Frequently asked questions

Why use WebM instead of MP4 on a website?

WebM is an open format built for the web and often produces smaller files at comparable quality, which can help pages load faster. It's well supported in modern browsers, though some older browsers and most non-web software still favor MP4.

Will the video and audio quality hold up?

The video is re-encoded, and WebM's compression is broadly comparable to MP4's, so visible quality differences are usually small. Very high-motion or high-detail footage can look marginally different after re-encoding, a normal side effect of any format conversion.

Do I need an account or a subscription?

Universal PDF requires a Pro subscription. One subscription unlocks every tool on the site, cancel anytime.

How long do you keep my video?

Your file uploads over an encrypted connection, and you can delete it anytime from My Files.

Last updated: July 8, 2026