Full Green Screen

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Fill your whole screen with pure green to test the green sub-pixel channel, reveal dead pixels or use as a quick chroma-key backdrop. Free.

Tap to open full screen

Pick a color

Press Esc to exit, or use the ← → arrow keys to switch colors while in full screen.

What is it for?

Find dead pixels
A solid field makes pixels that never light up easy to see — check each color in turn.
Find stuck pixels
On a black screen, sub-pixels stuck on bright stand out instantly.
Clean your screen
A bright, even white surface reveals dust, smudges and fingerprints as you wipe.
Lightbox & tracing
Turn your display into a backlight for tracing drawings or viewing slides.
Bias & fill light
Use a full color screen as ambient bias lighting or a soft fill light for calls.
Chroma-key backdrop
A pure green or blue screen works as a quick background for green-screen effects.

About Full Green Screen

The Full Green Screen tool fills your display with pure green (#00FF00), lighting only the green sub-pixels. Since green contributes the most to perceived brightness, a faulty green sub-pixel is the defect users notice most — and a solid green field is the fastest way to find one before it bothers you daily.

The same page doubles as an instant chroma-key backdrop. Point a camera at a monitor, tablet or TV showing this screen and you have a makeshift green screen for video calls, streaming overlays and quick compositing tests — the exact saturated green that keying filters in OBS and video editors expect.

It is free and runs entirely in your browser. Enter full screen with one click, switch between the five test colors with the arrow keys, pick a custom shade if your keying setup prefers a different green, and press Esc to exit.

How to use Full Green Screen

  1. Click the monitor preview or "Go full screen" to fill the display with pure green.
  2. For a pixel test, scan the panel for dark dots or off-color specks.
  3. For chroma keying, frame the screen behind your subject and enable the key filter in your software.
  4. Use the custom color picker if your keyer needs a different shade, and press Esc to exit.

Frequently asked questions

For small-scale setups, yes — a large monitor or TV displaying pure green behind a subject keys surprisingly well in OBS or a video editor. Keep the screen evenly lit, avoid reflections and glare, and don’t wear green.

The human eye is most sensitive to green, and green carries the largest share of a display’s perceived brightness. A dead or stuck green sub-pixel is therefore the most visible kind of pixel defect in everyday use, making this channel worth checking first.

Yes — completely free and browser-only. The page renders a solid green field locally; there are no uploads, accounts or limits.

Pure #00FF00 is the common starting point because it is maximally saturated and rare in skin tones and clothing. If your lighting causes spill or your keyer struggles, use the custom color picker to try a slightly darker or less saturated green.

Dark dots indicate a dead green sub-pixel at that location, while red- or blue-tinted specks reveal sub-pixels stuck on in the other channels. Cross-check any suspect spot on the red and blue screens using the arrow keys.
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