Screen Test — Free Online Test for Any Display
Fill your screen with solid white, black, red, green, blue and gray to spot dead or stuck pixels — plus a flashing fixer that may revive stuck ones.
Processed entirely in your browser — nothing you enter here is ever uploaded.
Result
About this tool
This page opens the screen test in its default view: start the tool and it fills the entire screen with one solid color at a time — white, black, red, green, blue and gray — so you can inspect the panel for anything that stands out.
It works the same on a desktop monitor, a laptop panel, a phone or a tablet: any screen you can open a browser on. Solid colors are the fastest way to judge a display you don't know well yet, whether that's a unit at the store, something just unboxed, or a hand-me-down device.
Spot something that looks stuck rather than permanently dark? The tool's fixer mode is one click away and worth a session before you write the pixel off. This test never uploads anything or installs software — it is just solid colors, drawn in your own browser.
Example. Choosing the red swatch paints the full-screen overlay #ff0000.
Limit. The flasher cycles five colors and never reads pixels back, so it cannot report a dead-pixel coordinate.