Dead Pixel Test: Find Dead and Stuck Pixels on Your Screen
Fill your screen with solid colours one at a time to spot pixels that stay black or stuck on one colour. Useful when you get a new monitor or laptop, while you can still return it.
What to look for
Stuck pixel: stays one colour (red, green or blue), easiest to see on black.
Dust or a mark: moves or wipes off when you gently clean the screen.
Your display
| Screen (CSS pixels) | – |
| Device pixel ratio | – |
| Approx. physical pixels | – |
| Colour depth | – |
The test only shows solid colours. Nothing flashes and nothing leaves your device.
How to use this dead pixel test
- Clean the screen first with a dry microfibre cloth. Dust looks a lot like a dead pixel.
- Click “Start full-screen test.” Each click (or → / Space) shows the next colour; ← goes back; Esc finishes.
- Look slowly across the whole screen on each colour, from about arm’s length, then closer.
- Do it at full brightness, in a dim room if possible.
What you might find
| What you see | Most likely | Best colours to spot it |
|---|---|---|
| A dot that stays black on every colour | Dead pixel: the pixel gets no power | White, then red, green, blue |
| A dot that stays red, green or blue | Stuck subpixel: one colour channel is stuck on | Black |
| A dot that stays white | Stuck pixel (all subpixels on) | Black |
| A spot that moves or disappears after cleaning | Dust or a mark, not a pixel fault | Any |
| A faint shadow of a previous image | Image retention or burn-in (mostly OLED) | Grey |
What to do next
- New monitor or laptop: check the return window. Retailers often accept returns within a short period. After that, it depends on the manufacturer’s pixel policy, which varies by brand and model: some replace a unit for a single bright pixel, others require several defective pixels. Find the policy on the manufacturer’s support site for your exact model before you contact them.
- Stuck subpixels sometimes recover on their own over days of normal use. Some people use “pixel fixer” videos that flash colours rapidly. We don’t offer one, because rapid flashing can trigger seizures in people with photosensitive epilepsy, and results are not reliable.
- Dead (black) pixels don’t recover. They’re a hardware fault in that pixel’s transistor.
How it works
The test fills the whole screen (using your browser’s Fullscreen API) with pure colours: black, white, red, green, blue, grey, cyan, magenta and yellow.
The Your display panel reads the screen size and pixel ratio your browser reports. With Windows display scaling, the physical figure is calculated (CSS pixels × device pixel ratio), so it may differ slightly from the panel’s specification.
Privacy
Nothing is uploaded or stored. The test only changes colours on your own screen.
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Last updated: October 5, 2026. Built and maintained by 123EasyTech.