Screen Color Tester

What is Screen Color Tester?

Screen Color Tester fills your screen with a solid color so you can spot dead, stuck, or hot pixels on your monitor. Cycle through red, green, blue, white, and black to check every pixel.

How to use

1. Click a color button or press arrow keys to fill the screen with that solid color.
2. Examine your entire screen carefully for any dots that don't match the background color.
3. Cycle through all colors — dead pixels show as black dots, stuck pixels show as colored dots on non-matching backgrounds.

Result

Testing a new 27-inch monitor — cycle through pure red, green, blue, white, and black. A stuck pixel appears as a bright green dot on the pure red screen, confirming a sub-pixel defect.

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