Free Screen Test Tool - Dead Pixel Checker | Monitor Test
Detect Dead Pixels & Display Issues
Free online screen testing tool to detect dead pixels, stuck pixels, and display issues. Test your monitor, laptop, phone, and tablet screens with professional color and pattern tests.
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
Why Test Your Screen?
Regular monitor testing helps detect dead pixels, stuck pixels, color distortion, and display uniformity issues early. Essential for new monitor validation, used equipment inspection, and professional design work verification.
Universal Compatibility
Test all screen types: desktop monitors, laptop displays, tablets, smartphones, TVs, and projectors. Compatible with LCD, LED, OLED, AMOLED, and all display technologies across different brands and resolutions.
Professional Testing
Comprehensive testing suite including solid color tests, gradient tests, grid patterns, and motion tests. Thoroughly evaluate color accuracy, response time, uniformity, and pixel integrity for professional standards.
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 screen 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.