Dead-Pixel Test
Fill your screen with uniform Black, White, Red, Green, Blue, and Mid Gray inspection screens and look for pixels that do not belong. Free, private (everything runs in your browser), and photosensitive-safe — colours only change when you change them.
Dead-Pixel Inspection Tool
This tool fills your screen with uniform solid colours so you can spot dead, stuck, or hot pixels with your own eyes. No website can automatically detect physical panel defects — the browser has no sensor access to your display hardware. Inspection here is purely visual: open a colour, look closely for dots that do not belong, then move to the next colour.
Manual control only — colours never change on their own. There is no flashing or strobe mode. Best in a dim room at full brightness; clean the screen first so dust is not mistaken for a defect.
What each inspection colour reveals
- Black (#000000): Reveals stuck-on (bright) pixels and backlight bleed. Look for any lit subpixel against full black.
- White (#FFFFFF): Reveals stuck-off (dark) pixels and uneven brightness or dim corners.
- Red (#FF0000): Tests the red subpixel. A dead red channel appears as a cyan/teal dot.
- Green (#00FF00): Tests the green subpixel — the most common failure. A dead green appears as a magenta dot.
- Blue (#0000FF): Tests the blue subpixel. A dead blue appears as a yellow dot.
- Mid Gray (#808080): A 50% gray reveals mid-tone banding, dirty-screen effect, and uneven panel uniformity.
Dead vs stuck vs hot pixels
A dead pixel is permanently off — a tiny black speck visible on every colour, including white. A stuck pixel is frozen with one subpixel channel lit, so it shows as a red, green, blue, cyan, magenta, or yellow dot depending on which channel failed. A hot pixel is stuck fully on and glows white against dark backgrounds. Dust or smudges wipe away; panel defects do not move when you gently change viewing angle.
Tips for a reliable check
- Clean the display first — dust is the most common false positive.
- Test at full brightness in a dim room for maximum contrast.
- Check at your normal viewing distance first, then move closer for confirmation.
- Scan in sections (top-left → top-right → bottom) rather than staring at the center.
- On phones and tablets, rotate the device — a real defect rotates with the panel.
Frequently Asked Questions
Can this page automatically detect dead pixels?
No. No website can automatically detect physical panel defects — the browser has no sensor access to your display hardware. This tool fills the screen with uniform solid colours so you can visually spot dead, stuck, or hot pixels with your own eyes.
What is the difference between a dead pixel and a stuck pixel?
A dead pixel is permanently off and appears as a tiny black dot on every colour. A stuck pixel is frozen on one subpixel channel (red, green, or blue) and appears as a coloured dot that never changes. A hot pixel is stuck fully on and appears white on dark screens.
Which colours should I check, and what does each reveal?
Check all six inspection screens: Black reveals stuck-on (bright) pixels and backlight bleed, White reveals stuck-off (dark) pixels, Red, Green, and Blue each isolate one subpixel channel, and Mid Gray reveals banding and uneven panel uniformity.
How do I inspect my screen step by step?
Clean the screen first so dust is not mistaken for a defect, set brightness to full in a dim room, open each colour fullscreen, and scan the panel slowly in sections. Use the arrow keys or Prev/Next buttons to move between colours, and press Esc or the Exit button to finish.
Does this test use flashing or strobe effects?
No. Colours change only when you advance them manually — there is no auto-cycling, timer, or flashing mode, so the test is safe for photosensitive users.