Monitor Test

Start the Dead Pixels test and cycle through the full-screen solid colors (black, white, red, green and blue). Clean the screen first, then inspect it from close range. A dead pixel stays black on every color, while a stuck pixel glows in a single color on a black background.

A dead pixel receives no power, so it stays black no matter what color the screen shows. A stuck pixel has one or more sub-pixels permanently lit, so it appears as a tiny red, green or blue dot on dark backgrounds. Stuck pixels sometimes recover on their own; dead pixels are usually permanent and may qualify for a warranty claim.

Use the Uniformity test with a solid black or dark gray pattern in a dim room. Clouding, bright patches or glowing edges indicate backlight bleed. A small amount of corner glow is normal on IPS panels; large bright areas on a new monitor are a valid reason for a return.

The gamma pattern reveals whether your monitor's tone curve matches the standard 2.2 target. If the calibration bands do not blend at the marked value, adjust the gamma setting in the monitor's OSD menu or in your graphics driver until they do.

No. The test runs entirely in your browser and keeps working even offline once loaded. Nothing is uploaded — the page makes no network calls at all.