Screen Test
Test your display with solid colors and gradients. Click a color to go fullscreen.
Press ESC or click to exit
What to Look For
- Dead or stuck pixels (bright dots on black, dark dots on white)
- Uneven backlight (light bleed on edges with black screen)
- Color accuracy (reds should look red, not orange)
- Banding in gradients (visible steps instead of smooth transitions)
How to Use This Test
- Click any color button in the grid above to display that color in fullscreen mode on your monitor.
- Examine the entire screen carefully for dead pixels, stuck pixels, or uneven areas while in fullscreen.
- Use the Auto Cycle, Gradient, and Checkerboard modes for a thorough display assessment, then press ESC to exit.
What This Test Checks
This screen test displays solid colors, gradients, and patterns in fullscreen to help you identify display defects and evaluate overall screen quality.
- Dead pixels (always dark) and stuck pixels (always bright or one color)
- Backlight uniformity and light bleed around edges
- Color accuracy and saturation for primary and secondary colors
- Gradient smoothness and color banding issues
- Overall display panel quality and consistency
Troubleshooting
If you're having issues:
- Make sure your display brightness is set to a comfortable level and your room lighting is dim for best visibility.
- If fullscreen mode does not activate, try pressing F11 or check that your browser allows fullscreen display.
- For accurate color testing, disable any night mode, blue light filter, or color profiles temporarily.
- If you find dead pixels on a new monitor, contact the manufacturer as most have dead pixel warranty policies.
Frequently Asked Questions
How do I check for dead pixels on my monitor?
Click on a solid color (especially white, black, red, green, and blue) to view it fullscreen. Carefully scan the entire screen for tiny dots that do not match the displayed color. Dead pixels appear as black dots on colored backgrounds, while stuck pixels show as bright colored dots on a black background.
What is backlight bleed and how do I detect it?
Backlight bleed is when light leaks around the edges or corners of an LCD screen, most visible on a black background. Use the black color test in a dark room and look for lighter areas along the edges. Some bleed is normal on IPS panels, but excessive bleed may indicate a defective display.
Can I use this test to calibrate my monitor colors?
This test helps you visually assess color accuracy by displaying pure colors and gradients, but it is not a substitute for professional monitor calibration. For precise calibration, use a hardware colorimeter along with calibration software. This test is useful for a quick visual check.
Why do the colors look different on my screen compared to another monitor?
Color differences between monitors are caused by varying panel types (IPS, VA, TN), color gamut coverage, factory calibration, brightness settings, and color temperature. Each display renders colors slightly differently unless both are professionally calibrated to the same standard.
Time to upgrade? Consider these monitors:
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