Monitor Test Suite
Comprehensive display tests for dead pixels, backlight bleed, color accuracy, and response time
Your display
All tests run fullscreen. For best results, test in a dark room and ensure your monitor has been on for 30 minutes. Press ESC or the exit button to leave any test.
Tests
Dead pixel detector
Cycle through solid color screens (red, green, blue, white, black) to identify dead or stuck pixels. Click anywhere to advance.
Stuck pixel fixer
A draggable box that rapidly flashes RGB colors at high frequency. Position it over stuck pixels to help unstick them.
Color uniformity / gradient test
Fullscreen gradients from black to white, plus individual R/G/B channels. Check for visible banding or uneven transitions.
Response time visual
A moving white rectangle on a black background at various speeds. Observe motion blur and ghosting characteristics.
Backlight bleed test
Pure black fullscreen display with adjustable brightness. Check for light leaking from monitor edges in a dark room.
Viewing angle test
Alternating gradient and checkerboard patterns with labeled color swatches to evaluate viewing angle consistency.
Monitor testing tips
- Run the dead pixel test first, it is the quickest way to identify defective pixels
- For backlight bleed testing, turn off all room lights and let your eyes adjust for 30 seconds
- Color uniformity issues are more visible on IPS panels viewed head-on; check at various angles
- Response time ghosting is easier to spot at higher motion speeds
- The stuck pixel fixer works best when run for at least 20 minutes on the affected area
About monitor testing
Dead pixels are permanently off (black on any color). Stuck pixels show a fixed color. Stuck pixels can sometimes be fixed with rapid color cycling; dead pixels cannot.
Light leaking from monitor edges is normal on LCD panels but varies in severity. IPS glow appears as silvery sheen at angles and is distinct from backlight bleed.
Visible steps in gradients indicate limited color depth or poor gamma calibration. 8-bit panels may show banding that 10-bit panels do not.
Ghosting and motion blur appear as trails behind moving objects. Faster panel response times (1-4ms) reduce this effect significantly.
About this tool
- 1
Choose a test
Select from dead pixel, stuck pixel fixer, gradient, response time, backlight bleed, or viewing angle tests.
- 2
Go fullscreen
Each test launches in fullscreen mode for accurate results. Click to cycle through patterns or press ESC to exit.
- 3
Dead pixel test
Cycle through solid red, green, blue, white, and black screens - look for pixels that stay a different color.
- 4
Backlight bleed
View a black screen in a dark room to check for light leaking from the edges of your display.
- Run the dead pixel test in a dimly lit room for easier detection.
- Stuck pixels can sometimes be fixed by running the pixel fixer over them for 10-20 minutes.
- Backlight bleed is most visible on IPS and VA panels - OLED displays have no backlight bleed.
- The gradient test reveals color banding - fewer visible steps means better color depth.
- Dead pixel detector with solid color fullscreen cycling (R/G/B/W/K)
- JScreenFix-style stuck pixel fixer with draggable flashing box
- Color uniformity and gradient banding test
- Response time visualization with moving objects at various speeds
- Backlight bleed test with adjustable dark screen brightness
- Viewing angle test with gradient and checkerboard patterns
- Checking a new monitor for dead or stuck pixels during the return window
- Testing display uniformity on a professional monitor for photo/video editing
- Comparing backlight bleed between monitors when deciding which to keep
- Attempting to fix a stuck pixel before requesting a warranty replacement