Video to WebM converter

Files up to 100 MB. This tool re-encodes the picture, so it takes videos up to 5 minutes long.

Your file is deleted from our server as soon as the result is made, and the result 15 minutes later.

Result

Preview before you download

Add your file to begin. The result shows here.

Publishing a talk or a lesson?

Studio edits the full recording first: retakes and pauses out, captions in, ready to post.

Edit a full recording free

00:20How it works

How to convert a video to WebM

Add your videoMP4, MOV, MKV, AVI and the other common formats work.
Pick quality and sizeBalanced suits most web pages. Lower the resolution if the video will sit in a small box on the page.
Convert and downloadThe WebM plays in the result panel so you can check it before using it.

00:30The details

What goes in and what comes out

Accepts: MP4, MOV, WEBM, MKV, AVI, M4V, TS, MTS, M2TS, FLV, WMV, MPG, MPEG, VOB, 3GP, GIF
Returns: WebM (VP9, Opus)
Limits: Files up to 100 MB. This tool re-encodes the picture, so it takes videos up to 5 minutes long.
Privacy: Your file is uploaded to our processing server over an encrypted connection, worked on, and deleted. The uploaded file is removed as soon as the result is ready; the result is removed 15 minutes later. Nobody looks at it and it is never used for anything else.
Cost: Free. No account, no watermark, no trial that runs out.

00:35Worth knowing

Getting a good result

When WebM is the right choice

WebM is an open format built for web pages. Chrome, Firefox, Edge and current Safari play it directly, and a VP9 WebM is often smaller than an H.264 MP4 of similar quality. Use it for a video you embed on your own site with the HTML video tag, ideally with an MP4 as a fallback source.

When to stay with MP4

For anything you upload to a social platform, send to a client or open in an editor, MP4 is safer. Older iPhones and many editing programs do not open WebM.

What is inside the file

VP9 video and Opus sound at 96 kbps. The encoder runs in its fast mode so a clip is ready in about its own length; a slow offline encode of the same clip would be somewhat smaller.

00:40Questions

Video to WebM converter: common questions

Is WebM smaller than MP4?

Usually, at the same visual quality, because VP9 is a newer codec than H.264. How much depends on the footage.

Will WebM play on an iPhone?

Safari plays WebM fully from iOS 17.4, and from Safari 16 on a Mac. Older iPhones do not, which is why web pages usually offer both a WebM and an MP4 source.

Can I convert WebM back to MP4?

Yes, with the video to MP4 converter.

How long can the video be?

Up to 5 minutes and 100 MB.