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Green Screen — Fullscreen Green Test & Chroma Key

Fill your screen with solid white, black, red, green, blue and gray to spot dead or stuck pixels — plus a flashing fixer that may revive stuck ones.

The whole screen fills with a solid color. Click or use the arrow keys to cycle white, black, red, green, blue and gray; press Esc to finish.

If the browser blocks fullscreen, the test fills the browser window instead.

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Result

This page opens the dead pixel test directly on a solid green panel: press start and the whole screen turns pure green. Click or use the arrow keys for the other colors, Esc exits fullscreen.

As a display test, the green field lights only the green subpixels — a dark dot here means a dead green channel, and a dot of another color points to a stuck neighbor. Green defects are the easiest to spot for human eyes, which are most sensitive in this part of the spectrum.

The same page doubles as an improvised chroma key: a spare monitor, TV or tablet showing solid green can serve as a small keying backdrop behind a webcam shot. Be honest about the limits — a screen is glossy and unevenly lit compared to painted or fabric green screens, so it works best for head-and-shoulders framing with the display slightly defocused behind you.

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Accepted Formats & Rules

  • Fullscreen test cycle of white, black, red, green, blue and gray — advance by click or arrow keys, exit with Esc.
  • Stuck-pixel fixer: a small draggable region flashes red, green, blue, white and black on every animation frame.
  • Works even when fullscreen is blocked: the test falls back to filling the browser viewport.

Key Benefits

✓ Runs entirely in your browser: one click takes the whole screen to a solid color — no downloads, no permissions, no watermarks.
✓ Covers both failure types: solid color panels expose dead and stuck pixels, and the flashing fixer gives stuck subpixels a real chance to recover.
✓ Honest by design: the fixer may revive stuck (colored) pixels, but no software can repair a truly dead (always black) pixel — the tool says so upfront.

Use Cases

  • • Inspect a brand-new or second-hand display before the return window closes: cycle the solid colors and look for dots that refuse to match.
  • • Tell a stuck pixel from a dead one by checking red, green and blue separately — then run the flashing fixer on stuck (colored) pixels.
  • • Use the white screen as a soft lamp for video calls, or the black screen to judge OLED true black and LCD backlight bleed in a dark room.