Dead Pixel Test
Pick a colour, or press Start test to cycle through all colours in fullscreen.
Full-screen pixel check
Auto-cycles 9 colours · tap or press → to skip
Your screen
- Resolution
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- Viewport
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- Pixel ratio
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- Colour
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How it works
- Wipe the screen, set brightness high.
- Go fullscreen and step through colours.
- Any dot that differs is a bad pixel.
Shortcuts
- F fullscreen
- ←→ / click: colour
- Esc exit
Found a stuck pixel?
Stuck pixels are often lit in one colour and can sometimes be revived.
Open stuck pixel fixer →How to use
- Clean the screen and turn brightness up.
- Tap a colour or press Start test; tap or use the arrow keys to change colour.
- Look for dots that stay black, white or one colour. Press Esc to exit.
Free dead pixel test for any screen
This dead pixel test fills your display with solid colours so faulty pixels stand out. Pick a colour, press Fullscreen, or press Start test to cycle black, white, red, green, blue, yellow, cyan, magenta and grey automatically every 3 seconds. Click or use the arrow keys to move on, and press Esc to leave.
How to check your monitor for dead pixels
- Clean the screen with a dry microfibre cloth so dust is not mistaken for a pixel.
- Set brightness high and turn off night mode or blue-light filters.
- Press Start test and look slowly across the screen on each colour, from about 30-50 cm away.
- On black, look for lit dots (stuck or hot pixels). On white and the primary colours, look for dark dots (dead pixels).
- Note the colour and location of anything you find.
Colour pixel test
Solid colours in fullscreen to spot dead pixels.
Stuck pixel fixer
Flashing or gentle mode window with timer.
Hot pixel test
Black screen to reveal always-on pixels.
Backlight bleed test
Black screen for edge light leaks.
Phone pixel test
Tap-to-change colours for phones.
Screen resolution test
Resolution, viewport and pixel ratio.
Screen contrast test
Grey steps, black and white levels.
Pixel policies
Warranty and return guide.
Dead, stuck and hot pixels explained
Each pixel is made of red, green and blue sub-pixels. A dead pixel stays black on every colour because it gets no power. A stuck pixel shows a fixed colour such as red, green or blue because one or more sub-pixels stay on. A hot pixel stays white or bright and is easiest to see on black. See dead pixel vs stuck pixel for photos-free ways to tell them apart.
Can a stuck pixel be fixed?
Sometimes. Rapidly changing colours over the spot can free a stuck sub-pixel. Try the stuck pixel fixer for 10-20 minutes. True dead pixels usually cannot be repaired by software.
Troubleshooting what you see
- Dot moves when you scroll or drag the window: it is on the image, not the panel.
- Dot wipes away: dust or a mark. See how to clean a screen safely.
- Glow at the edges on black: that is backlight bleed or IPS glow; use the backlight bleed test.
- Faint permanent image on OLED: that is burn-in or image retention, not a pixel fault.
- Colour banding: check gradients in the screen contrast test.
When to return a monitor or claim warranty
If the test shows a pixel that never changes, note its colour and position and take a photo with the test colour on screen. Most retailers accept returns within their own return window regardless of pixel policy, so act quickly after purchase. After that window, manufacturer warranty applies, and many brands only replace a panel once a set number or type of defects is reached. Read your exact model’s policy, and see our pixel policy and warranty guide for how the ISO pixel classes work.
Frequently asked questions
How long does a full pixel check take?
About a minute. Step through each colour in fullscreen and look over the whole screen, including the corners and edges.
Can a website fix a dead pixel?
No. A dead pixel gets no power or has a broken transistor, so no software can light it. A stuck pixel is different and sometimes responds to the stuck pixel fixer.
Does this test work on phones, TVs and laptops?
Yes. It runs in any modern browser. On a phone, tap the screen to change colour; on a smart TV or a cast screen, open the page in the TV browser and use the arrow keys.
Is anything uploaded or installed?
No. The colours are drawn by your browser; nothing is installed and nothing about your screen is sent to us.
Why does my screen show a tiny dot only on one colour?
That is typical of a stuck sub-pixel: one of the red, green or blue parts is stuck on or off, so it stands out on some colours and disappears on others.