Is Video to WebM free? Is there a watermark?

Yes — Video to WebM is free to use with no sign-up or watermark. Very large files can still be limited by your browser's available memory and processing resources.

Do my files get uploaded to a server?

No. Video to WebM runs entirely in your browser with WebAssembly, so your MP4, MOV, MKV file never leaves your device and nothing is stored or seen by us.

What can I put in, and what do I get out?

Video to WebM accepts MP4, MOV, MKV and gives you back a WEBM file. You can also set bitrate before you run it. Actual codec support depends on what the bundled engine or browser decoder can read.

Will I lose quality converting to WEBM?

The VP8 conversion is lossy and uses the bitrate you select. Detailed or fast-moving scenes generally need more bitrate than simple motion.

Free tools · Convert

Video to WebM

Convert an MP4 or MOV to WebM (VP8/Vorbis), an open, web-optimised video format. Everything happens locally in your browser.

Runs entirely in your browser. Your file is never uploaded — no watermark, no account.

Drop a file or click to chooseMP4, MOV, MKV

Get a better result

Best for: Preparing web delivery where an open WebM asset is preferred, especially for browser playback that does not require an MP4-only editing workflow.
Input → output: MP4, MOV, or MKV input becomes VP8 video with Vorbis audio in WebM at a selectable 0.5, 1, or 2 megabits per second.
Quality tip: Start at 1 Mbps for ordinary motion and use 2 Mbps for detailed interfaces or fast movement. Compare at the intended display size.
Know before running: The encode is lossy, and a fixed bitrate gives complex scenes fewer bits per detail than simple scenes. WebM is also less convenient in some editors and older Apple-oriented workflows.
Next step: Grab a thumbnail to create a poster image for the WebM asset.

How to use Video to WebM

1
Choose your file. Drop a supported MP4, MOV, MKV file into the tool, or click to select one. It stays on your device — nothing is uploaded.
2
Pick your settings. Adjust the available options, then press Run. The first processing run loads the browser engine before conversion begins.
3
Download. Review the result, then download the finished file from your browser with no watermark.

Frequently asked questions

Is Video to WebM free? Is there a watermark?: Yes — Video to WebM is free to use with no sign-up or watermark. Very large files can still be limited by your browser's available memory and processing resources.
Do my files get uploaded to a server?: No. Video to WebM runs entirely in your browser with WebAssembly, so your MP4, MOV, MKV file never leaves your device and nothing is stored or seen by us.
What can I put in, and what do I get out?: Video to WebM accepts MP4, MOV, MKV and gives you back a WEBM file. You can also set bitrate before you run it. Actual codec support depends on what the bundled engine or browser decoder can read.
Will I lose quality converting to WEBM?: The VP8 conversion is lossy and uses the bitrate you select. Detailed or fast-moving scenes generally need more bitrate than simple motion.