Dead Pixel Test — Check Your Monitor Free
Instantly check your monitor, laptop screen, or phone display for dead pixels and stuck pixels. Cycle through full-screen solid colors — black, white, red, green, blue — to reveal any defective pixels. No download required.
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Types of Pixel Defects Explained
Dead Pixel
Permanently black. Receives no power. Visible as a dark dot especially on bright/white backgrounds. Usually not fixable without hardware replacement.
Stuck Pixel
Always lit in one color — red, green, or blue. Visible as a colored dot that doesn't change. Sometimes fixable with rapid color cycling (use the Fix button above).
Hot Pixel
All subpixels stuck on — appears as a bright white dot. Most visible on dark/black backgrounds. A variant of stuck pixels, more common in older LCD panels.
Frequently Asked Questions
How do I test my monitor for dead pixels?
Click the fullscreen button above, then cycle through each solid color (black, white, red, green, blue, gray). Inspect every corner and area of your screen. A dead pixel will appear as a fixed dot that doesn't change color with the background. A stuck pixel will stay illuminated (often red, green, or blue) even on black backgrounds.
What is the difference between a dead pixel and a stuck pixel?
A dead pixel is permanently off — it appears black at all times because the pixel receives no power. A stuck pixel is permanently on in one color (typically red, green, or blue) because the pixel is stuck in an always-lit state. Hot pixels are a variant of stuck pixels that glow white (all channels stuck on).
Can dead pixels be fixed?
Dead pixels (permanently black) are generally not fixable and may qualify for a warranty replacement. Stuck pixels sometimes can be fixed using pixel-cycling software that rapidly flashes colors to 'unstick' the transistor. Press the Fix Stuck Pixel button in the tool above to run a rapid color cycle on your screen.
How many dead pixels are acceptable on a new monitor?
ISO 13406-2 defines pixel defect classes. Class I (top quality): zero dead pixels allowed. Class II (mainstream monitors): up to 2 dead pixels. Class III (budget): up to 5. Most manufacturers follow Class II or III, but many premium brands offer zero dead pixel guarantees. Check your warranty for specific terms.
How do I test pixels on a laptop screen?
Use this tool in fullscreen mode (press F11 or the fullscreen button). On macOS, press Control+Command+F. On Windows, most browsers fullscreen with F11. Then cycle through each test color and examine every area of the screen carefully.
What colors should I test for dead pixels?
Test with: Black (reveals stuck/hot pixels), White (reveals dead/dark pixels), Red (reveals stuck red or dead red subpixels), Green (reveals green subpixel issues), Blue (reveals blue subpixel issues), and Gray (reveals subtle uniformity and backlight bleed issues).