What is the difference between a dead and a stuck pixel?

A dead pixel stays black on every color. A stuck pixel stays lit in one color and shows as a bright dot on the black screen.

Why is the resolution shown different from my monitor's?

Display scaling and browser zoom change the CSS resolution. The physical figure multiplies it by the pixel ratio and is usually the native resolution.

Is anything recorded or uploaded?

No. The test runs entirely in your browser. Nothing is recorded, stored or sent to a server.

Dead Pixel and Screen Test - Free Online Tool

JavaScript is turned off. InspireTools processes files in your browser, so the tools need JavaScript to run.

Fill the screen with solid colors to find dead pixels, and see your display details.