Color Screen

Fill your whole display with one solid color — red, green, blue, white, black and more. Great for color checks, testing red/green/blue sub-pixels, spotting backlight bleed, or as simple full-screen mood lighting.

Pick a color to fill the screen, or press the button to start. Once full-screen, use the arrow keys or on-screen swatches to switch color and Esc to exit.

Choose a color
Cycle every color to check the whole panel.

What a Color Screen Is For

Each solid color reveals something different about a display. Running through them is a quick, no-software way to judge panel quality.

1

Test sub-pixels

Set solid red, green and blue in turn. Each screen should be one even shade — a dead sub-pixel leaves a dark dot and a stuck one shows the wrong color. The dead pixel test automates this cycle.

2

Check black & backlight

A solid black screen shows backlight bleed and “IPS glow” as lighter patches near the edges — useful when comparing panels or checking a new monitor in a dark room.

3

Mood light & background

A full field of color makes quick mood lighting, a colored backdrop for photos and video, or a solid green for a makeshift chroma-key. Turn brightness up for the strongest effect.

Frequently Asked Questions

What is a color screen tool for?
Filling the display with one solid color lets you check color accuracy, test individual red, green and blue sub-pixels, reveal stuck pixels, check for backlight bleed on black, and use the screen as simple mood lighting or a plain colored background.
How do I test red, green and blue sub-pixels?
Set the screen to solid red, then green, then blue in turn. On each color the whole panel should be one even shade. A sub-pixel that is dead leaves a dark dot; a stuck sub-pixel shows the wrong color. For an automatic run-through, use the dead pixel test.
Does the color screen work on a phone or TV?
Yes — any modern browser on a phone, tablet, laptop or smart TV. Tap the screen to show the controls and change color; the solid-color fill always works even where full-screen support is limited.
Is anything uploaded or installed?
No. It runs entirely in your browser with no upload, no account and nothing to install, and works offline once loaded. See also the plain white screen.