Color Screen

A color screen tool fills the whole display with one solid color so you can check color accuracy, test the individual red, green and blue sub-pixels, and reveal stuck or dead pixels. Solid black shows backlight bleed and IPS glow near the panel edges, while solid white shows trapped dust and dead pixels. A single flat field also exposes tint, patchiness and uneven brightness that a busy desktop hides. The same full-screen fill doubles as mood lighting, a colored backdrop for photos, or a makeshift chroma-key green.

To 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, and a stuck sub-pixel shows the wrong color. For an automatic run-through, use the dead pixel test page.

The color screen works in 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 on devices where full-screen support is limited. On a TV, open the page in the built-in browser or cast the tab from a laptop.

The color screen tool uploads nothing and needs no install. It runs entirely in your browser, with no account, no download and no data leaving your device. Once the page has loaded it keeps working offline. For a single fixed color, the plain white screen and black screen pages do the same job in one click.