Green Screen — Fullscreen Chroma Green & Dead Pixel Test

Fill your display with bright chroma green (#00ff00). Use it for dead pixel checks, a quick green reference, or small-scale chroma-key tests. Free, local.

What it does

This page shows a pure, bright green (#00ff00) fullscreen. It’s useful for checking the green channel of your display for dead or stuck pixels, for a quick on-screen green reference, and for small-scale chroma-key experiments.

How it works

The color is pure green with the red and blue channels off, so any pixel that fails to light its green element shows up as a dark or magenta speck. For chroma-key work, note that bright #00ff00 is a screen test green; many studios use a slightly different green such as #00b140. Type any hex into the color box to change it, and see how your footage keys against it in the Green Screen Live Previewer.

How to use it

1. Press Go fullscreen (or F).
2. Scan the whole screen for dark or oddly colored dots.
3. To try a different green, type a hex (for example #00b140) or drag left and right on the screen to shift the hue.
4. Press Esc to exit.

FAQ

Is this a real green screen for filming?

A monitor can act as a small green backdrop for tiny subjects or tests, but it lights unevenly and is not a replacement for a fabric or painted screen with proper lighting.

What does a dead pixel look like on green?

A dead pixel often shows as a black dot; a stuck pixel shows as a point stuck in one color, such as red, blue or white. The Display test mode in the Color Screen tool steps through all five test colors.

Why isn’t this the same green as CSS “green”?

CSS green is a darker #008000. This tool uses the brighter #00ff00 that people mean by a “green screen”. You can type #008000 if you need the CSS one.

Privacy

Everything runs in your browser. Nothing is uploaded and no network requests are made while you use it.