Dead Pixel Test
Test your monitor, phone, or display for dead pixels and stuck pixels instantly
Test Colors
What is a Dead Pixel Test?
A dead pixel test is a diagnostic tool that displays solid colors across your entire screen to help identify dead pixels or stuck pixels. Dead pixels appear as black dots that don't emit light, while stuck pixels remain one color (red, green, or blue) regardless of what's displayed. This test helps you check monitor quality, phone screen defects, or display issues before purchasing or after warranty claims.
Our free dead pixel test tool displays red, green, blue, white, black, and gray colors that fill your entire screen. By cycling through these colors, you can easily spot any pixels that don't match—indicating dead or stuck pixels. This is essential for checking display quality on new monitors, phones, tablets, or laptops before the return period expires.
Dead pixel tests are commonly used by gamers checking new monitors, professionals verifying display quality, and anyone purchasing screens. Early detection helps you return defective displays within warranty periods or return windows. Our tool works on any device—desktop monitors, laptops, phones, tablets, and TVs.
How to Test for Dead Pixels
Testing for dead pixels is straightforward with our free tool. Follow these steps to thoroughly check your display:
Step 1: Open the Tool
Use the dead pixel test tool above. Click "Fullscreen" or press F to enter fullscreen mode for best results. Fullscreen mode ensures you test the entire display area without browser UI elements interfering.
Step 2: Cycle Through Colors
Click "Next" or use arrow keys to cycle through red, green, blue, white, black, and gray. Spend 10-15 seconds examining each color. Look carefully across the entire screen, including edges and corners.
Step 3: Identify Defects
Dead pixels appear as black dots on colored backgrounds. Stuck pixels appear as colored dots (red, green, or blue) that don't change. Test in a dimly lit room for better visibility. Use auto-cycle mode to automatically switch colors every 3 seconds.
Step 4: Document Issues
If you find dead or stuck pixels, take photos showing their exact location. Note how many pixels are affected and their positions. Contact the manufacturer or retailer with this evidence for warranty claims or returns.
Dead Pixels vs Stuck Pixels: Understanding the Difference
Understanding the difference between dead pixels and stuck pixels helps you identify display issues accurately:
Dead Pixels
- • Appear as black dots on any background
- • Completely non-functional—don't emit light
- • Permanent hardware defect
- • Cannot be fixed or repaired
- • Usually covered under warranty
- • More noticeable on bright backgrounds
Stuck Pixels
- • Appear as colored dots (red, green, or blue)
- • Stuck on one color, don't change
- • May be fixable with repair software
- • Can sometimes be massaged away
- • Less common than dead pixels
- • More noticeable on dark backgrounds
Testing Dead Pixels on Different Devices
Our dead pixel test works on all display types. Here's how to test different devices:
Desktop Monitors
Use fullscreen mode and test all colors. Check edges and corners carefully. Test both LCD and LED monitors. Most manufacturers allow 1-3 dead pixels depending on screen size.
Laptops & Phones
Open the tool in your mobile browser and use fullscreen. Test in a dark room for better visibility. Phone manufacturers typically have stricter dead pixel policies due to high pixel density.
OLED Displays
Test OLED screens with all colors, especially black (reveals OLED-specific issues) and white (shows dead pixels). OLED dead pixels appear as black dots that don't emit light.
Dead Pixel Warranty and Return Policies
Dead pixel warranty coverage varies by manufacturer. Most have a dead pixel policy specifying acceptable pixel defect counts. Premium displays often offer zero-dead-pixel guarantees, while budget displays may allow 1-3 dead pixels depending on screen size and location.
Dead pixels in the center of the screen are typically covered more readily than edge pixels. Many manufacturers will replace displays with multiple dead pixels or dead pixels in critical viewing areas. Always test new displays immediately and document any defects with photos for warranty claims.
If you discover dead pixels within the return period (usually 14-30 days), consider returning the product rather than relying on warranty. Retailer return policies are often more lenient than manufacturer warranties for pixel defects.
Dead Pixel Test FAQ
What is a dead pixel test?
A dead pixel test is a diagnostic tool that displays solid colors (red, green, blue, white, black) across your entire screen to help identify dead pixels or stuck pixels. Dead pixels appear as black dots that don't light up, while stuck pixels remain one color (red, green, or blue) regardless of what's displayed. This test helps you check monitor quality, phone screen defects, or display issues before purchasing or after warranty claims.
How do I test for dead pixels?
Use our free dead pixel test tool above. Click through each color (red, green, blue, white, black) and carefully examine your screen. Dead pixels appear as black dots on colored backgrounds. Stuck pixels appear as colored dots (red, green, or blue) that don't change. Use fullscreen mode for best results, and test each color for at least 10-15 seconds. Look for any pixels that don't match the current color being displayed.
What's the difference between dead pixels and stuck pixels?
Dead pixels are completely non-functional and appear as black dots on any background—they don't emit light at all. Stuck pixels are stuck on one color (usually red, green, or blue) and remain that color regardless of what should be displayed. Dead pixels are permanent defects, while some stuck pixels can be fixed using pixel repair software or gentle pressure techniques. Both indicate display quality issues.
How many dead pixels are acceptable?
Most manufacturers consider 1-3 dead pixels acceptable depending on display size and type. For monitors under 15 inches, 1 dead pixel may be acceptable. For larger displays (24+ inches), 2-3 dead pixels might be within tolerance. However, many users find even one dead pixel unacceptable, especially on expensive displays. Check your manufacturer's dead pixel policy—some offer zero-dead-pixel guarantees for premium models.
Can dead pixels be fixed?
Dead pixels cannot be fixed—they're permanent hardware defects where the pixel's subpixels have failed. However, stuck pixels (pixels stuck on one color) can sometimes be repaired using pixel repair software that rapidly flashes colors, gentle pressure techniques, or massaging the affected area. If you discover dead pixels on a new display, contact the manufacturer for warranty replacement or return the product if within the return period.
How do I test my phone for dead pixels?
Use this dead pixel test tool on your phone's browser. Open the tool, tap fullscreen mode, and cycle through each color (red, green, blue, white, black). Carefully examine your phone screen for any pixels that don't match the current color. Dead pixels appear as black dots, while stuck pixels appear as colored dots. Test in a dark room for better visibility. Most phone manufacturers have strict dead pixel policies due to high pixel density.
What causes dead pixels?
Dead pixels are caused by manufacturing defects, physical damage, or component failure. During LCD/LED manufacturing, individual pixel transistors can fail, creating dead pixels. Physical pressure, impact, or manufacturing inconsistencies can also cause pixel failure. Dead pixels are more common in cheaper displays but can occur in any screen. They're typically present from manufacturing but may develop over time.
How do I test my monitor for dead pixels?
Use our dead pixel test tool in fullscreen mode. Display each solid color (red, green, blue, white, black) and examine your monitor carefully. Look for black dots (dead pixels) or colored dots that don't change (stuck pixels). Test the entire screen area, including edges. Use auto-cycle mode to automatically switch colors every 3 seconds, or manually navigate with arrow keys. Test in a dimly lit room for better visibility.
Are dead pixels covered under warranty?
Dead pixel warranty coverage varies by manufacturer and display type. Most manufacturers have a dead pixel policy specifying how many dead pixels are acceptable. Premium displays often have zero-dead-pixel guarantees. Check your manufacturer's warranty terms—many will replace displays with multiple dead pixels or dead pixels in the center of the screen. Document dead pixels with photos and contact customer support within the warranty period.
What colors should I test for dead pixels?
Test red, green, blue, white, and black colors. Red tests red subpixels, green tests green subpixels, blue tests blue subpixels. White tests all subpixels together—dead pixels appear as black dots. Black reveals stuck pixels (colored dots). Gray helps identify partially stuck pixels. Our tool includes all essential test colors and auto-cycle mode for comprehensive testing. Each color reveals different types of pixel defects.
How long should I test for dead pixels?
Spend at least 10-15 seconds examining each color to thoroughly check your entire screen. For a complete test, cycle through all colors (red, green, blue, white, black, gray) multiple times, spending 30-60 seconds total per color. Use fullscreen mode and examine edges carefully. Test in different lighting conditions. A thorough dead pixel test takes 5-10 minutes to check every area of your display properly.
Can I test OLED screens for dead pixels?
Yes, our dead pixel test works on OLED, LCD, LED, and all display types. OLED screens can develop dead pixels or burn-in issues. Test OLED displays with all colors, paying special attention to black (which reveals OLED-specific issues) and white (which shows dead pixels). OLED dead pixels appear as black dots that don't emit light. Test regularly to catch issues early, especially on new OLED displays.
What should I do if I find dead pixels?
Document the dead pixels with photos showing the exact location. Check your manufacturer's dead pixel policy and warranty terms. Contact customer support with evidence—many manufacturers will replace displays with dead pixels, especially if multiple exist or they're in the center of the screen. If within the return period, consider returning the product. For stuck pixels, try pixel repair software before seeking replacement.