The tester below opens on white so you can inspect the full panel immediately.
Screen Tester is a free, browser-based white screen test to spot stuck pixels, tint, dust, and panel uniformity issues.
A white screen test gives you a clean bright background for checking stuck pixels, tint, dust, and panel uniformity. It is useful when a monitor looks slightly dirty, yellow, blue, or uneven but the issue is hard to judge on a normal wallpaper.
If you need a darker inspection view for glow or bleed, switch to the black screen test.
A full white background makes colored stuck pixels, tint, dust, and uneven brightness easier to spot than most normal desktop backgrounds.
Yes. Red, green, blue, or bright defects often stand out quickly on a clean white screen.
Yes. The page runs in the browser and works on laptops, external monitors, tablets, and many phones.
