Inspect displays for stuck or dead pixels with pure full-screen color canvases, or use your monitor as an ambient reading and video call light.
Tip: Reveals backlight bleeding, IPS glow, and stuck bright subpixels.
Appears as a permanent black dot against bright white or red backgrounds. The pixel transistor has stopped receiving power.
Appears as a bright red, green, or blue dot stuck permanently illuminated, especially visible on pure black backgrounds.
If the speck looks blurred or changes position slightly when you move your head angle, it is dirt on the glass, not a defect.
Inspect displays for stuck or dead pixels with pure full-screen color canvases, or use your monitor as an ambient reading and video call light.
Fast and easy from start to finish
Start Test: Click Start Fullscreen Display to expand the pure color canvas across your entire screen.
Inspect Screen: Press Arrow keys or Spacebar to cycle colors and search for irregular dots or bright specks.
Use as Lamp: Switch to Reading Light mode to illuminate your desk or face during evening calls.
What you can do with this tool
Pure full-screen color canvases (Black, White, Red, Green, Blue, Cyan, Magenta, Yellow)
Keyboard and click navigation to cycle test patterns without interface clutter
Adjustable ambient reading lamp with color temperature presets (2700K to 6500K)
Educational defect guide explaining dead pixels vs stuck subpixels vs surface dust
Unlock batch scale, higher resolution, and expanded limits
Rapidly cycle subpixels to help stimulate and unstick lazy pixels.
Overlay screen alignment grids to check display geometry and viewing angles.
Run simultaneous test patterns across multi-monitor setups.
Answers to common questions about Screen Dead Pixel Checker & Reading Light
A dead pixel remains permanently black and unpowered across all colors, whereas a stuck pixel stays lit as a fixed red, green, or blue dot on dark backgrounds.
Testing screens identifies defects. Some stuck pixels can unstick over time or through rapid RGB cycling, while dead pixels typically require hardware panel replacement.
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