Screen Brightness Tester

Test and adjust your screen brightness levels

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