FillTheScreen.com
Active Test Pattern:White
Diagnostic Utility

Dead Pixel Test - Online Monitor & Screen Diagnostic Tool

Comprehensive dead pixel checker for LCD, LED, and OLED screens. Cycle through pure solid red, green, blue, white, and black test screens to quickly spot defective pixels.

Key Features

8 Pure Test Pattern Colors
Auto-Cycling Timer mode (3s interval)
Grid & Crosshair Pixel Locator
Keyboard shortcut navigation (Arrow keys, Space)

How to Use This Utility

  1. 1Click 'Start Test' or press 'Space' to enter fullscreen mode.
  2. 2Use Left/Right Arrow keys or click to cycle through test colors: White, Black, Red, Green, Blue, Yellow, Cyan, Magenta.
  3. 3Carefully scan your monitor for dark spots (dead pixels) or bright stuck subpixels.

Frequently Asked Questions

What is the difference between a dead pixel and a stuck pixel?

A dead pixel is completely dark/black because it receives no power. A stuck pixel is stuck on a specific color (red, green, or blue) regardless of what the screen displays.

How do I fix a dead pixel?

Dead pixels (permanently unpowered) usually cannot be fixed digitally, but stuck pixels (subpixel transistors frozen on) can often be unstuck using our Stuck Pixel Fixer tool.