FREE TOOL
Dead Pixel Tester
Check your screen for dead or stuck pixels. Fill your display with solid colors and look for any dot that does not match.
How to use
- Click Enter Fullscreen for best results (or use the preview below).
- Look closely at the screen for any dot that does not match the solid color.
- A dot that is always black = dead pixel. A dot stuck on a color = stuck pixel.
- Click the display or press Space / Arrow Right to cycle colors.
- Test all 8 colors: black, white, red, green, blue, cyan, magenta, yellow.
Color 1 of 8 - Click the panel or press Space to advance
Why Use Our Dead Pixel Tester?
8 Test Colors
Cycles through black, white, red, green, blue, cyan, magenta, and yellow - each designed to reveal different types of dead or stuck pixels.
True Fullscreen Mode
Click Enter Fullscreen to fill your entire monitor with a solid color for the most accurate pixel inspection possible.
Click or Keyboard Navigation
Click anywhere on the panel to advance to the next color. In fullscreen, use Space, Arrow Right, or Arrow Left to cycle colors hands-free.
Dead vs Stuck Pixels
A pixel stuck on black shows on any bright color. A stuck-on-color pixel shows against a black screen. Testing all 8 colors catches both types.
Works on Any Display
Use it on monitors, laptop screens, tablets, or phone screens. Any device with a browser can run the tester.
No Sign-up Required
Open the page and start testing immediately. No account, no app download, and nothing is uploaded to any server.
Frequently Asked Questions
What is a dead pixel?
A dead pixel is a pixel on your screen that no longer works and appears as a permanently black dot, regardless of what is displayed. It cannot be fixed by software.
What is a stuck pixel?
A stuck pixel is one that is permanently lit in one color - often red, green, or blue - instead of black. Unlike dead pixels, stuck pixels can sometimes be fixed using flashing color tools.
How do I find dead pixels?
Fill your screen with solid colors and look for any dot that does not match. A black dot on a white screen is a dead pixel. A colored dot on a black screen is a stuck pixel. Use fullscreen mode for the most accurate test.
Why do I need to test multiple colors?
Each subpixel (red, green, blue) can fail independently. Testing only one color may miss stuck subpixels. Testing all 8 colors - especially red, green, blue, black, and white - provides complete coverage.
Can I fix a dead pixel?
Dead pixels are permanent hardware failures and cannot be fixed by software. Stuck pixels sometimes respond to rapid color cycling tools. Most display warranties cover dead pixels above a certain count threshold.
Is the dead pixel tester free?
Yes. Completely free with no account, no app download, and nothing uploaded to any server. It works on any browser-capable device.
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