Dead Pixel Test
Fill your screen with solid colors to detect dead pixels, stuck pixels, or hot pixels. Click a color button below to enter fullscreen mode.
How to Use
- • Click a color button → Enter fullscreen mode
- • Press ← → or click to change colors
- • Press ESC to exit
- • Carefully scan the entire screen for any abnormal spots.
What are Dead Pixels?
Dead Pixel: A pixel that is always black. The backlight is blocked, so no light comes through.
Stuck Pixel: A pixel stuck on one color (red, green, or blue) that doesn't change.
Hot Pixel: A pixel that is always white or bright.
What is a Dead Pixel Test?
A dead pixel test is a diagnostic tool that helps you identify defective pixels on your monitor or display screen. By filling your screen with solid colors, you can easily spot pixels that are stuck, dead, or displaying incorrect colors.
This test is essential when purchasing a new monitor, inspecting used displays, or diagnosing display issues on laptops, tablets, and smartphones. Defective pixels may qualify for exchange or refund under manufacturer warranty policies.
User Guide
- Click on a color button (red, green, blue, white, or black) to start the test
- The screen switches to fullscreen mode with that solid color
- Slowly scan the entire screen for any abnormal spots or pixels
- Use arrow keys or click to cycle through all five colors
- Press ESC when you have finished testing all colors
Core Features
- 5 Solid Color Tests: Red, green, blue, white, and black to cover all defect types
- Fullscreen Mode: Fills the entire screen without toolbars for thorough inspection
- Keyboard Controls: Use left/right arrow keys to quickly switch between colors
- Click Navigation: Simply click anywhere to advance to the next color
- Universal Display Support: Works on monitors, laptops, tablets, and smartphones
When This Comes in Handy
- New Monitor Inspection: Check for defective pixels immediately after unboxing
- Used Display Purchase: Verify the screen condition before buying secondhand monitors
- Laptop Checkup: Test laptop displays for pixel defects
- Post-Repair Verification: Confirm no new pixel issues after screen repair
- Periodic Maintenance: Regularly check long-used monitors for developing defects
Common Questions
Q: What is the difference between dead, stuck, and hot pixels?
Dead pixels appear as permanently black spots. Stuck pixels are frozen on a single color (red, green, or blue). Hot pixels show as bright white or colored spots. Dead pixels are usually permanent, while stuck pixels can sometimes be recovered with repair tools.
Q: How many dead pixels are acceptable on a new monitor?
This varies by manufacturer. Some premium brands offer zero dead pixel guarantees, while others allow 1-5 defective pixels before accepting warranty claims. Always check the specific policy before purchasing.
Q: Should I test in a dark room?
It is not strictly required, but testing in a dark environment makes defective pixels significantly easier to spot. Hot pixels and backlight bleeding on black screens are especially visible in darkness.
Q: What is a hot pixel?
A hot pixel is one that always appears as a bright white or colored dot. It is most visible on a black screen. Hot pixels are similar to stuck pixels but tend to glow brighter. They can also occur on camera sensors.
Q: Can dead pixels be fixed with software?
True dead pixels are hardware defects and cannot be repaired with software. Stuck pixels, however, sometimes recover using pixel exerciser tools that rapidly flash colors. Results vary and are not guaranteed.
Q: Does this test work on mobile devices?
Yes, you can use this tool on smartphone or tablet browsers. However, fullscreen mode support may vary depending on your device and browser.
Q: Is backlight bleed the same as dead pixels?
No, they are different issues. Backlight bleed occurs when light leaks around the edges of the screen and appears as brighter areas on dark backgrounds. If the edges look bright on a black screen, it is likely backlight bleed rather than pixel defects.
Q: What is IPS glow and how is it different?
IPS glow is a characteristic of IPS panels where the corners appear brighter depending on viewing angle. If the bright area changes as you move your head, it is IPS glow. If a bright spot stays fixed in the same position, it is a pixel defect.
Q: Are there official standards for pixel defects?
Yes, ISO 13406-2 defines pixel defect classes. Class I allows zero defects, Class II allows up to 2, Class III up to 5, and Class IV up to 50. Most consumer monitors follow Class II standards.
Q: Is any data collected during the test?
No, the dead pixel test simply displays solid colors on your screen. No data is collected or sent to any server. It runs entirely locally in your browser.
How It Works
The dead pixel test fills the entire screen with solid colors (red, green, blue, white, black) to visually identify defective pixels. Full-screen mode eliminates UI distractions, with keyboard or click to switch colors. Dead pixels appear always black, hot pixels always bright, and stuck pixels remain fixed on a specific color.
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