Mobile Screen Tester & Brightness Check
Check for dead pixels, screen bleed, and adjust your display brightness levels. Troubleshoot screen issues below.
🔍 Dead Pixel Test
Cycles through solid colors (Red, Green, Blue, White, Black) in full screen so you can inspect your screen for defective pixels. Clean the screen first!
🔦 Screen Bleed Test
Turns the screen pure black and maximizes brightness so you can see if the backlight is bleeding into the edges of the display. Go to a dark room for best results.
Brightness Control
DarkBright100%
Test Patterns
Normal View
Current brightness: 100%
Testing Tips
- • Use different test patterns to check uniformity
- • Test in various lighting conditions
- • Check for dead pixels with solid colors
- • Use fullscreen for better testing
- • Adjust brightness for comfort
What to Look For
- • Even brightness across the screen
- • No flickering or artifacts
- • Color accuracy in different patterns
- • Proper black levels
- • No backlight bleeding
Technical Information
• This tool uses CSS filters to adjust brightness
• Hardware brightness controls may override software adjustments
• Different display technologies (LCD, OLED) may show different results
• Ambient light sensors can affect automatic brightness
• Wake Lock API support: ❌ Not supported