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Free Dead Pixel Test Online
Check your monitor for dead pixels, stuck pixels and abnormal subpixels using fullscreen solid colors. No download or installation is required.
Works on desktop monitors, laptops and compatible browser displays.
Step by step
How to Run a Dead Pixel Test
- Clean your monitor screen to avoid confusing dust with defective pixels.
- Click Start Dead Pixel Test.
- Allow fullscreen mode when prompted. If fullscreen is unavailable, the test will still fill the browser viewport.
- Review all 12 screens: black, white, red, green, blue, cyan, magenta, yellow and four gray levels.
- Click or tap anywhere outside the control panel to move to the next test color.
- Use Previous, Next or Auto when you want more control over color changes.
- Select Hide This Control Panel for an unobstructed view. Press H on a keyboard or press and hold the touchscreen to show it again.
- Inspect the center, corners and edges. If a suspicious pixel appears, compare the same spot across several colors.
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Clean the screen before testing: Remove dust and fingerprints so they are not mistaken for defective pixels.
Increase brightness and turn off display filters: Set brightness to 100%, disable eye-care or night mode, blue-light filtering and HDR enhancement, then inspect the screen in a slightly darkened room.
What Is a Dead Pixel?
A dead pixel is a display pixel that no longer responds normally and commonly appears as a permanently dark point. Depending on the panel design, the fault may involve the entire pixel or one or more red, green and blue subpixels. A dark mark that remains in the same location on white, red, green and blue screens may indicate a dead pixel, although dust, surface damage and debris can look similar. Clean the panel gently and compare the same spot across several test colors before drawing a conclusion.
What Is a Stuck Pixel?
A stuck pixel or subpixel remains active in an incorrect state instead of changing normally with the image. It may stay red, green, blue, white or another fixed color as the test background changes. The appearance depends on which subpixel components are affected, so the point can be easier to see on some colors than others. Comparing the same location on black, white and primary-color screens helps distinguish a stuck pixel from content, dust or a reflection. This test identifies symptoms but does not guarantee a repair.
Dead Pixel vs Stuck Pixel
| Dead Pixel | Stuck Pixel |
|---|---|
| Usually dark | Often remains one fixed color |
| Often remains black across multiple test colors | May appear red, green, blue or white |
| Usually hardware-related | Behavior may differ depending on the subpixel state |
A browser test can help you locate unusual pixels, but it cannot confirm the cause or guarantee that a panel can be repaired.
Common questions
Dead Pixel Test FAQ
Is this dead pixel test free?
Yes. The tool runs in your browser without a download, account or payment.
Can this tool fix dead pixels?
No. It displays solid colors to help locate possible pixel defects; it does not repair panel hardware.
How do I identify a stuck pixel?
Look for a point that stays red, green, blue, white or another fixed color while the surrounding test colors change.
Why are black, white, red, green and blue used?
These backgrounds make dark, bright and individual red, green or blue subpixel behavior easier to compare.
Can I test a 4K monitor?
Yes. For the clearest inspection, use the monitor's native resolution and view every part of the panel carefully.
Can I use this test on a laptop screen?
Yes. It works on laptop displays in a compatible browser, with fullscreen used when the browser permits it.
Can I use this test on an OLED monitor?
Yes. It can reveal pixels that do not follow the solid test colors, but it does not diagnose every OLED uniformity or image-retention issue.
Does screen resolution affect the test?
The tool works at different resolutions. Native display resolution and normal scaling provide the most direct pixel-by-pixel inspection.
For distributors and brands
Testing Monitors for an OEM Project?
Yanxun Display manufactures gaming and office monitors for global OEM and wholesale customers. Panel inspection, pixel standards and display specifications can be discussed according to project requirements.