Free Dead Pixel Test
A free dead pixel test: 9 fullscreen colours to find dead and stuck pixels.
What to look for
- Dead pixel: a black dot on bright screens.
- Stuck pixel: a red, green or blue dot that never changes.
- Hot pixel: a bright dot on the black screen.
Colour screens
Tap a colour to test it fullscreen
Custom colour
Your Screen Info
Detected in your browser
Shortcuts
- F Fullscreen
- → Next screen
- ← Previous
- Esc Exit
On a phone or tablet, tap to go to the next screen.
What is a dead pixel test?
A dead pixel test shows a series of solid fullscreen colours: white, black, red, green, blue, cyan, magenta, yellow and gray. Each colour lights the subpixels in a different way, so a faulty pixel stands out against at least one of them.
Run this test when you buy a new or used monitor, laptop, phone or TV, ideally before the return window closes. It takes under a minute and needs nothing but your browser.
How to run the test
1
Clean the screen
Remove dust so it does not look like a pixel fault.
2
Start the test
Click the Start button or press F. The first colour opens fullscreen.
3
Step through the colours
Click, tap or press → for the next colour. Press Esc to stop.
What a dead, stuck or hot pixel looks like
Dead pixel
A black dot on bright colours. The pixel gets no power and usually cannot be fixed.
Stuck pixel
A dot stuck on red, green, blue or another colour. Stuck pixels sometimes recover; try the stuck pixel fixer on the home page.
Hot pixel
A bright white dot on the black screen.
Dust or a scratch
A spot that moves when you wipe the screen or looks the same on every colour is on the surface, not a pixel.
Related tests
Black Screen Test
Pure black for hot pixels and light leaks
White Screen Test
Pure white for dead pixels and dust
Monitor Screen Test
Check a new or used monitor
Laptop Screen Test
Check a laptop display
Mobile Screen Test
Check a phone or tablet screen
TV Screen Test
Check a TV in its browser
LCD Screen Test
Bleed, evenness and pixels on LCD
Frequently asked questions
How many dead pixels are acceptable?
It depends on the maker. Many brands replace a monitor only above a set number of faulty pixels, so check your warranty terms.
Can a dead pixel be fixed?
A truly dead pixel usually cannot. A stuck pixel can sometimes be revived with flashing colours or gentle pressure.
Does the test work on phones?
Yes. It works on phones and tablets: tap to go to the next colour and tap × to exit.
Is my screen data uploaded?
No. The test runs in your browser and nothing leaves your device.