Is Video to WebM free? Is there a watermark?

Yes — Video to WebM is completely free, with no sign-up, no watermark, and no limit on how many files you process.

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.

Will I lose quality converting to WEBM?

No noticeable loss for most files — Video to WebM uses high-quality settings (a two-pass colour palette for GIFs, H.264 at a visually-lossless quality for video), so the result stays crisp.

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

How to use Video to WebM

1
Choose your file. Drop a file into the tool, or click to select one. It stays on your device — nothing is uploaded.
2
Pick your settings. Adjust the options if you like, then press Run. The first run downloads a ~32 MB engine once; after that it's instant.
3
Download. Everything is processed right in your browser — download the finished file instantly, with no watermark.

Frequently asked questions

Is Video to WebM free? Is there a watermark?: Yes — Video to WebM is completely free, with no sign-up, no watermark, and no limit on how many files you process.
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.
Will I lose quality converting to WEBM?: No noticeable loss for most files — Video to WebM uses high-quality settings (a two-pass colour palette for GIFs, H.264 at a visually-lossless quality for video), so the result stays crisp.