Dead Pixel Test
Prank and Fake Screens
Screen Test & Utility Tools
Dead Pixel Test
Click or press → for the next color · Esc to exit
Dead Pixel Test: Check Your Screen in 30 Seconds
A dead pixel test is simple: fill the screen with a series of solid colors and look closely. Defective pixels that hide on a busy desktop stand out immediately against a pure, uniform color. Click the preview above to go fullscreen, then click anywhere (or press the arrow keys) to step through white, black, red, green, blue, and more. Press Escape when you are done.
Dead vs. Stuck vs. Hot Pixels
- Dead pixel: stays black on every color. The pixel receives no power - most visible on the white screen.
- Stuck pixel: frozen on one color (often red, green, or blue). It shows up on the solid color screens that do not match its stuck subpixel - visible as a bright dot on black, or a wrong-colored dot on red/green/blue.
- Hot pixel: always white, most visible on the black screen. Common on cameras, rarer on displays.
Step through every color: a defect that appears on only one or two colors is a stuck subpixel, while a dot that is black everywhere is truly dead.
How to Fix a Stuck Pixel
Dead pixels are permanent hardware defects, but stuck pixels sometimes recover:
- Run a color cycle for 10-30 minutes. Rapid color changes can jolt a stuck subpixel back to life - leave this test cycling, or use our glitch screen as an unconventional exerciser.
- Gentle pressure. With the screen off, press very lightly on the spot with a soft cloth, then turn the display on while releasing. Use minimal force - this is at your own risk and not recommended for OLED panels.
- Wait. Some stuck pixels resolve themselves over days of normal use.
Check Warranty Before You Accept Defects
Most manufacturers define a maximum number of allowed defective pixels per panel class (ISO 9241-307). Many premium monitor lines - and most phone brands - replace panels with even a single dead pixel within the warranty window. Run this test the day a new device arrives, and screenshot-document anything you find.
Buying a Used Monitor or Phone?
This page works on any device with a browser - no install, no signup. Open it on the seller's device, run the color cycle fullscreen, and you will know the panel's true condition in under a minute. Pair it with the white screen test to also check for tint, uniformity, and backlight bleed.
Frequently Asked Questions
How do I run the dead pixel test?
Click the preview to go fullscreen, then click anywhere or press the arrow keys to cycle through solid colors. Look closely for dots that stay black or glow the wrong color. Press Escape to exit.
What is the difference between a dead pixel and a stuck pixel?
A dead pixel receives no power and stays black on every color. A stuck pixel is frozen on one color and shows up as a bright or wrong-colored dot on some test colors but not others. Stuck pixels can sometimes be revived; dead pixels are permanent.
Can a dead pixel be fixed?
A truly dead pixel cannot be fixed - it is a hardware defect. A stuck pixel sometimes recovers after running a rapid color-cycling exercise for 10-30 minutes, or occasionally on its own over a few days.
How many dead pixels are acceptable under warranty?
It depends on the manufacturer's pixel policy (based on ISO 9241-307 classes). Many premium monitor and phone brands replace panels with even one dead pixel during the warranty period, so always check your brand's policy and test new devices immediately.
Does this test work on phones and TVs?
Yes. It runs in any browser, so you can test monitors, laptops, phones, tablets, and smart TVs. On a TV, open this page in the TV browser or cast a full-screen color from another device.
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