White Black Screen
Diagnostic Tool / Pixel Inspector

Online Dead Pixel & Screen Test

Use ← → to switch colors
Quick Palette:
White Screen Black Screen Green Blue Red Dead Pixel Test Color Picker
Click to Enter Fullscreen Press Space / F · 1-9 for Brightness
Display Diagnostics

How to Test for Dead and Stuck Pixels

Modern LCD, IPS, and OLED panels consist of millions of RGB (Red, Green, Blue) subpixels. When a transistor fails or becomes unresponsive, it results in visible screen defects.

1
Dead Pixel (Always Dark): A dead pixel is permanently turned off and appears as a persistent black dot on bright white or solid color screens.
2
Stuck Subpixel (Constant Color): A stuck pixel remains constantly illuminated in Red, Green, or Blue. It is easiest to detect against contrasting black or white screens.
3
Backlight Bleed & IPS Glow: Common on LED panels where light leaks through display edges. A fullscreen black screen in a dark room makes bleeding immediately apparent.
Launch Interactive Dead Pixel Test
DIAGNOSTIC TEST PATTERNS 8 Primary Modes
White #FFF
Black #000
Red #F00
Green #0F0
Blue #00F
Yellow #FF0
Cyan #0FF
Magenta #F0F
Fast Navigation: Left / Right Arrow

Cycle through each color fullscreen. Inspect the display from approximately 12–18 inches away in a dimly lit room for maximum accuracy.

03 / Frequently Asked Questions

Everything You Need to Know

Common questions about screen utilities, color temperature, dead pixels, and monitor care.

What is the difference between a dead pixel and a stuck pixel?

A dead pixel is permanently unpowered and shows up as a black dot on light backgrounds. A stuck pixel is stuck in an 'on' state and shows up as a persistent single color (Red, Green, or Blue) on contrasting backgrounds. Stuck pixels can sometimes be unstuck using rapid color cycling tools.

How do I use this dead pixel checker?

Click the screen or press 'F' to enter fullscreen. Use your keyboard's Left and Right arrow keys (or tap the screen) to cycle through White, Black, Red, Green, Blue, Yellow, Cyan, and Magenta. Inspect your display closely for any irregularities.

How many dead pixels are considered acceptable under manufacturer warranty?

Most monitor manufacturers (Dell, ASUS, LG, Samsung) follow ISO 9241-307 Class II standards, which generally allow between 1 and 5 defective subpixels before qualifying for a warranty replacement. Checking early helps you exchange defective units within standard return periods.

Can dead pixels spread across the monitor?

True dead pixels caused by a blown transistor do not spread. However, if dead pixels appear after physical impact or liquid damage, internal panel degradation might cause adjacent pixels to fail over time.

Does this dead pixel test work on smartphones, tablets, and TVs?

Yes. This tool is completely browser-based and responsive. It works on iPhone, iPad, Android phones, MacBooks, Windows PCs, and smart TV browsers with full touch and remote control support.