Display & Dead Pixel Test — Check your phone screen in seconds
Run a complete display and dead pixel test online: check for stuck pixels, color accuracy, backlight bleed, and screen uniformity. Works on iPhone, Android, and all modern devices — no app to install.
Test your phone display for dead pixels
Cycle through color patterns to check for dead pixels, stuck pixels, backlight bleed, and color accuracy. Tap the screen to advance to the next pattern.
How to test your phone display
Follow these simple steps to run a complete screen test and detect display issues.
Start the test
The test begins with a black screen. Look for any bright dots (stuck pixels) or white spots (backlight bleed).
Cycle through colors
Tap the screen or use the buttons to cycle through: Black, White, Red, Green, Blue, and Gradient.
Check each color
On white screens, look for dark spots (dead pixels). On red/green/blue, look for pixels that don't match.
Mark issues
Tap any suspicious pixels to mark them. The counter tracks how many you've found.
📱 iPhone display test
Works on all iPhones via Safari. Tests OLED and LCD displays for dead pixels and burn-in.
🤖 Android screen test
Compatible with Chrome and Samsung Internet. Tests AMOLED, OLED, and LCD screens.
💡 Dim the lights
Test in a dark room for the best visibility of backlight bleed and dark pixel issues.
👀 Look closely
Examine each color carefully. Dead pixels are black, stuck pixels are colored and don't change.
Why run a display and dead pixel test?
Your phone screen is what you look at all day. A quick check can save you from frustrating display issues.
Before buying used
Test the screen on a used phone before you pay. Confirm there are no dead pixels or burn-in.
After screen repair
If your screen has been replaced, run a display test to ensure proper installation and quality.
Selling your phone
Share a clean display test pass to build trust with potential buyers.
Warranty claims
Document dead pixels or display issues before filing a warranty claim.
Software vs hardware
Is your screen flickering or is it a hardware issue? The test helps you isolate the problem.
Peace of mind
Know your phone display is perfect before a big event or important task.
Frequently asked questions about display testing
A display and dead pixel test checks your screen for dead pixels (black dots), stuck pixels (colored dots), color accuracy, backlight bleed, and screen uniformity using a browser-based tool with no app install.
Open this page and cycle through the color test patterns (Black, White, Red, Green, Blue). Look for any pixels that don't match the background color — those are dead or stuck pixels.
Yes. The tool works on iPhone, iPad, and iPod touch through Safari. It tests all screen types including OLED and LCD displays.
Yes. The display and dead pixel test is completely free, with no signup, no ads, and no data collected.
Look for dead pixels (black dots), stuck pixels (colored dots), uneven brightness, backlight bleed (light patches on dark screens), and color accuracy issues.
A dead pixel is completely black and never lights up. A stuck pixel is stuck on one color (red, green, or blue) and doesn't change with the screen content.
Backlight bleed is when light from the screen's backlight leaks through the edges or corners, creating bright patches on dark screens. It's most visible on black screens in a dark room.
If you find dead pixels, try cleaning your screen (sometimes it's just dirt). If they persist, check if your device is under warranty — many manufacturers cover dead pixels.
Ready to test your phone display?
It takes less than a minute. No app to install — just tap through the colors and check your screen.