Dead Pixel Test Tool
Check Your Monitor, Smartphone or Tablet for Free
Launch the free Dead Pixel Test instantly to check your monitor, smartphone, or tablet. Identify dead and stuck pixels with our full-screen color tool. No download required
How to test dead pixels
Start Dead Pixel Test
1. Click on any color test to enter fullscreen mode
Navigate
2. Use arrow keys or click screen edges to switch colors
Exit
3. Press ESC key to exit fullscreen mode
Observe
4. Look for any pixels that don't match the background color
Pro Tips
- • Test in a dark room for better visibility of dead pixels
- • Use different viewing angles to detect uniformity issues
- • Take your time - some issues are only visible with careful observation
Color Tests
Test your screen with solid colors to detect dead or stuck pixels
Pattern Tests
Advanced tests for display quality assessment
Motion & Response Tests
Test screen response time and detect ghosting or motion blur using full-screen moving elements
Ghosting Test
White screen sweeps across black background - look for trailing ghost images
Response Time Test
Entire screen flashes between colors - check for smooth transitions
About Dead & Stuck Pixels
Dead Pixel: Appears as a black dot on all colors
Stuck Pixel: Shows a fixed color (red, green, blue, or white)
Tip: Test in a dark room for better visibility of issues
Key Features
Dead Pixel Detection
Identify completely black pixels on your display
Stuck Pixel Detection
Find pixels stuck on specific colors
Pattern Testing
Grid and line tests for display uniformity
Motion Testing
Detect response time and ghosting issues
How to Check for Dead Pixels?
Checking for dead pixels is simple: 1. Clean your screen to remove dust and smudges. 2. Press F11 or click any color test to enter fullscreen mode. 3. Cycle through solid colors (black, white, red, green, blue) and look for pixels that don't match the background. Dead pixels appear as black dots, while stuck pixels show as colored dots on contrasting backgrounds.
Dead Pixel vs. Stuck Pixel: What's the Difference?
Dead pixels and stuck pixels are different display defects. A dead pixel is completely unresponsive and appears permanently black on all colors because the transistor has failed. A stuck pixel is partially functional - it's stuck displaying one color (red, green, or blue) due to a sub-pixel remaining constantly on. Stuck pixels may be fixable, while dead pixels are permanent.
Can Dead Pixels Be Fixed?
Dead pixels (completely black) are typically permanent and cannot be repaired as the transistor is physically damaged. However, stuck pixels (showing red, green, or blue) can sometimes be fixed by running rapid color-cycling or flashing patterns for 10-20 minutes to unstick the affected sub-pixel. Our tool provides these repair functions to help restore stuck pixels.
ISO 13406-2 Standard for Monitors
ISO 13406-2 is the international standard for measuring LCD display quality, defining acceptable pixel defect limits. Class I displays allow zero defects, Class II allows up to 2 dead pixels, and Class III allows more. Most consumer monitors are Class II. Understanding this standard helps you know when to request a warranty replacement for your monitor.
Frequently Asked Questions
What are dead pixels and stuck pixels?
Dead pixels appear as black dots on all colors and cannot display any color. Stuck pixels are permanently lit and show a fixed color (red, green, blue, or white). Both are common LCD display issues that affect visual quality.
How do I use the display test tool?
Click any color test to enter fullscreen mode. Look carefully for pixels that don't match the background color. Use arrow keys to switch between colors and press ESC to exit. Test in a dark room for best results.
How often should I test my screen?
Test immediately when buying a new monitor, then every 3-6 months for regular maintenance. Also test whenever you notice display abnormalities, color issues, or suspect pixel problems.
What should I do if I find dead pixels?
For new monitors with dead pixels, contact the manufacturer for warranty or replacement. Minor stuck pixels can sometimes be fixed with pixel-fixing software. Severe pixel issues may require professional repair or replacement.