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MP4 to WebM

Convert an MP4 to WebM with VP9 video and Opus audio — compact files that play natively in modern browsers.

MP4 to WebM

MP4 → WebM (VP9) for the web

  1. Choose
  2. Process
  3. Download

Drop a file here, or click to choose

Up to 100MB · nothing is uploaded until you press Run

Up to 100MB

About this tool

This converts an MP4 into WebM, with VP9 video and Opus audio. WebM is the open format made for the web: it plays natively in Chrome, Firefox, Edge and recent versions of Safari, and VP9 usually gives a smaller file than H.264 at similar quality — useful for video you host on your own site.

How to convert MP4 to WebM

  1. 1.Choose the MP4 file.
  2. 2.Press Run and leave the tab open — WebM takes longer to encode than MP4.
  3. 3.Download the WebM.

When people use it

Video on your own website

Serve a WebM in a video element for a smaller download, with the MP4 as a fallback.

Background and hero videos

Short looping clips on a landing page load faster as WebM.

Lighter pages on mobile

A smaller video helps a page load quickly on a slow mobile connection.

What it will not do

Worth knowing before you upload, rather than after.

  • VP9 encoding is slow, so this takes longer than the other conversions.
  • Older Apple devices and many editing apps do not play WebM. Keep the MP4 as your master copy.
  • Free files are limited to 100MB and 20 minutes.

Questions

How do I convert MP4 to WebM?

Choose the MP4 file above and press Run. WebM takes longer to encode than MP4, so leave the tab open until it finishes.

Is WebM smaller than MP4?

Usually, at similar visual quality, because VP9 compresses more efficiently than H.264. It depends on the footage.

Which browsers play WebM?

Chrome, Firefox and Edge play it natively, and so do recent versions of Safari. For older Apple devices, offer an MP4 as a fallback.

Is it free?

Yes — free, no account, no watermark, for files up to 100MB and 20 minutes long.

What happens to my file?

Your upload goes to private storage that is never public and never listed, and only the anonymous session that created the job can read it. The original file is deleted as soon as processing succeeds. The result stays available for about 90 minutes, and you can delete everything immediately with the Delete now button.

More conversions

Other tools

Want bigger files, several at once, or no queue? See Pro.