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Green Screen Video

Remove a green or blue screen and replace it with a colour, image, another video or transparency.

Free, no uploads, no sign-up. Runs 100% in your browser.

How Green Screen Video works

Uses the chromakey filter. A preview of one frame updates live while you tune the colour. Transparent output is saved as WebM with alpha. Video work runs in ffmpeg.wasm, the FFmpeg toolkit compiled to WebAssembly (GPL build, loaded as a separate engine file of about 30 MB the first time, then cached).

Input: MP4, MOV, WEBM, MKV, AVI, JPG, PNG. Output: MP4, WEBM.

How to use Green Screen Video

1. Drop a video onto Green Screen Video.
2. The first run downloads the ffmpeg engine (about 30 MB, once).
3. Set your range, format or quality options.
4. Process it (progress is shown live), then download.

Tips

• Shorter clips and lower resolutions process much faster.
• Processing speed depends on your CPU; plug in laptops for long jobs.
• Keep the tab in the foreground while encoding.

Green Screen Video FAQ

Are my files uploaded?

No. This tool runs entirely in your browser tab. Files are read from your disk into memory and the result is generated locally.

Is it free? Are there limits or watermarks?

Free and open source (MIT). There are no file-size caps, daily quotas, accounts or watermarks.

Does it work offline?

Yes, once the page (and any engine it needs) has loaded, it keeps working without a connection thanks to the service worker cache.

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