Full-screen color
White
A clean, full-brightness white canvas.
CoolScreen
Every screen, a single color.
CoolScreen turns any display into a pure field of color — white, black, red, green, or blue — in one keystroke. Test a panel, light a room, key a video call, or simply let the screen rest.
How it works
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Pick a color
Scroll, use the arrow keys, or press W, B, R, G, or U. The whole page follows along without reloading.
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Go full screen
Double-click a swatch or press Enter. A pure field of color fills your entire display.
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Press Esc to leave
Exit full screen and you land back on this page, exactly where you left it.
Keyboard shortcuts
Choose a color
Every color, one tap away
Questions, answered
How do I change colors?
Scroll with your mouse wheel, use the left and right arrow keys, or press W, B, R, G, or U. Double-click a color or press Enter to go full screen, and press Esc to exit.
Is CoolScreen free to use?
Yes. There is no account, no install, and no paywall. Open the page in any modern browser and the colors are ready to use.
Which color should I choose?
Use white to check dust and panel uniformity, black for dead pixels and backlight bleed, green for chroma key, red to protect night vision, and blue to inspect the blue channel.