Screen Color Test
Display any custom color in fullscreen mode to test color reproduction and evaluate your display.
Testing guide
How to use the screen color test
A solid fullscreen fill is the simplest and most revealing display test there is. With nothing else on screen, any dead pixel, stuck sub-pixel, dust speck, backlight leak, or patch of uneven brightness has nowhere to hide. This tool lets you fill the screen with any color you choose.
Best for
- Checking a new screen for pixel defects and uniformity problems across every primary color.
- Finding dust or smudges before cleaning, since a solid fill makes them obvious.
- Setting a specific color fullscreen for photography lighting, video backdrops, or matching a reference.
How to run the test
- 1Clean the screen first so dust is not mistaken for a pixel defect.
- 2Pick a color with the picker, type a hex value, or use one of the primary presets.
- 3Click Show Fullscreen and inspect the panel from a normal viewing distance.
- 4Cycle through red, green, blue, white, and black, since each one reveals a different class of defect.
How to read the result
A dot that stays black on every color is a dead pixel; one that stays a fixed color is a stuck pixel.
Lighter patches near the edges on a black fill are backlight bleed; broad uneven blotches are clouding.
Visible mottling on a mid-gray or solid color fill is the dirty screen effect, most noticeable on large panels.
Related tools and guides
Frequently asked questions
What colors should I use to test my screen?
Use white to reveal dead pixels and dust, black to reveal stuck pixels and backlight bleed, and pure red, green, and blue to reveal individual sub-pixel failures. Mid-gray is best for spotting uniformity problems and the dirty screen effect.
Why does a solid color show problems that normal content hides?
Ordinary images and text are visually busy, so your eye skips over a single wrong pixel or a slight brightness gradient. A uniform fill removes all that distraction, which makes even a one-pixel defect stand out clearly.
Can I use this as a fullscreen color background?
Yes. Enter any hex value or pick a color, then go fullscreen. People use it as a lighting source for photography and video calls, as a plain backdrop, or to set a specific reference color on a second monitor.
Why does the same color look different on my two monitors?
Different panels have different color gamuts, white points, and calibration. A color that is technically identical in hex can look warmer, cooler, or more saturated depending on the display. Use the Color Gamut and White Balance tests to see how far apart your screens actually are.
Does this test work on phones and TVs?
Yes. Any device with a modern browser can run it fullscreen. On a TV, open the browser app and go fullscreen; on a phone, rotate to landscape first so the fill covers the whole panel.
Testing guide
How to use the screen color test
A solid fullscreen fill is the simplest and most revealing display test there is. With nothing else on screen, any dead pixel, stuck sub-pixel, dust speck, backlight leak, or patch of uneven brightness has nowhere to hide. This tool lets you fill the screen with any color you choose.
Best for
- Checking a new screen for pixel defects and uniformity problems across every primary color.
- Finding dust or smudges before cleaning, since a solid fill makes them obvious.
- Setting a specific color fullscreen for photography lighting, video backdrops, or matching a reference.
How to run the test
- 1Clean the screen first so dust is not mistaken for a pixel defect.
- 2Pick a color with the picker, type a hex value, or use one of the primary presets.
- 3Click Show Fullscreen and inspect the panel from a normal viewing distance.
- 4Cycle through red, green, blue, white, and black, since each one reveals a different class of defect.
How to read the result
A dot that stays black on every color is a dead pixel; one that stays a fixed color is a stuck pixel.
Lighter patches near the edges on a black fill are backlight bleed; broad uneven blotches are clouding.
Visible mottling on a mid-gray or solid color fill is the dirty screen effect, most noticeable on large panels.
Related tools and guides
Frequently asked questions
What colors should I use to test my screen?
Use white to reveal dead pixels and dust, black to reveal stuck pixels and backlight bleed, and pure red, green, and blue to reveal individual sub-pixel failures. Mid-gray is best for spotting uniformity problems and the dirty screen effect.
Why does a solid color show problems that normal content hides?
Ordinary images and text are visually busy, so your eye skips over a single wrong pixel or a slight brightness gradient. A uniform fill removes all that distraction, which makes even a one-pixel defect stand out clearly.
Can I use this as a fullscreen color background?
Yes. Enter any hex value or pick a color, then go fullscreen. People use it as a lighting source for photography and video calls, as a plain backdrop, or to set a specific reference color on a second monitor.
Why does the same color look different on my two monitors?
Different panels have different color gamuts, white points, and calibration. A color that is technically identical in hex can look warmer, cooler, or more saturated depending on the display. Use the Color Gamut and White Balance tests to see how far apart your screens actually are.
Does this test work on phones and TVs?
Yes. Any device with a modern browser can run it fullscreen. On a TV, open the browser app and go fullscreen; on a phone, rotate to landscape first so the fill covers the whole panel.