Dead Pixel Test
Clean your screen, press Start and look closely at each colour. A dot that doesn't match is a dead or stuck pixel.
Click or press → for the next colour, ← to go back, Esc to exit.
How to Use the Dead Pixel Test
This dead pixel test fills your whole screen with one colour at a time: black, white, red, green, blue, cyan, magenta, yellow and grey. Each colour makes a different kind of fault stand out. Click to go to the next colour and press Esc to leave.
- Clean the screen. Dust looks just like a dead pixel.
- Start full screen. Press the button, or click a colour swatch.
- Look closely. Scan the screen slowly, section by section.
- Click for the next colour. Check every colour, then press Esc.
Dead, Stuck or Hot Pixel?
| Type | How it looks | Can it be fixed? |
|---|---|---|
| Dead pixel | Black dot on white and colours | Rarely. It is usually a warranty case. |
| Stuck pixel | Always red, green or blue | Often. Try the stuck pixel fixer. |
| Hot pixel | Always white, shows on black | Sometimes, same as stuck. |
What Is Each Colour For?
- Black: shows stuck and hot pixels, and backlight bleed.
- White: shows dead pixels and dust.
- Red, green, blue: show a stuck sub-pixel.
- Grey: shows uniformity problems.
Is a Dead Pixel Covered by Warranty?
It depends on the maker's pixel policy. Many allow a few dead pixels before a swap, while some promise "zero bright dots". Take a photo of the fault on the white or black screen before you contact support.
Frequently Asked Questions
Does it work on phones and TVs?
Yes. Open the page on any device with a browser and go full screen.
Can dead pixels spread?
Usually not. More may appear if the panel is damaged.
How long should I test?
A minute or two per colour is enough.
Can I test a new monitor?
Yes. Test as soon as you unbox it, while you can still return it.
Related Tools
Stuck Pixel Fixer
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