About this dead pixel test

This is a single-purpose page: solid colours that fill the screen, a grid so you can describe where a dot sits, and an optional stuck-pixel fixer that stays off until you start it. It is meant to be the version you can finish in two minutes and trust the explanation of.

What the page actually does

A browser cannot ask a panel for a pixel map. There is no connection to the graphics driver and no photograph of your screen. The test works because a healthy display draws one flat field, and a faulty pixel does not. You do the looking. That is also why the instructions spend time on dust, viewing angle and IPS glow: those are the things people mistake for a dead pixel.

The colour order is red, green, blue, white, black, then a colour you choose. Pure red, green and blue are there on purpose. A design-friendly green would hide the fault the test is for. Grey is the default custom colour because a stuck red, green or blue subpixel all show against it.

What it will not do

• It will not certify a screen as fault-free. Brightness, angle, scaling and a browser that cannot cover the bezel can all hide a dot.
• It will not tell you whether a maker will replace the panel. Those rules are per model. Inventing a number for “Dell” or “Samsung” would be a guess, so the warranty section describes how those policies are usually written and points you at the one for your model, and at your UK statutory rights.
• It will not promise that the fixer works. Stuck crystals sometimes free. Dead and hot pixels do not. The page says so next to the button.
• It does not ask you to press on the glass. Pressure is how panels crack.

No account

There is nothing to sign in to. The choice you make on the cookie banner is stored in this browser and nowhere else. The colour you pick and the grid checkbox last only until you leave the page. See the privacy policy for the hosting detail, and for the advertising and affiliate tools that are not switched on.

Who it is for

Someone who has just noticed a speck, or who is checking a display before the return window closes. It is also fine on a television or a console browser, with the limits described on the home page. It is not aimed at children. The fixer flashes, and an adult should be the one to start it.

The site is independent. It is not affiliated with a screen manufacturer, a retailer, Google or Amazon.

If something on the page is wrong, see the contact page.