Whitescreen: Display Test Tools

Fullscreen color screens, dead pixel, motion, input lag, HDR and monitor tests. Runs fully offline, no accounts, no tracking.

Full description: White Screen brings every display testing tool from whitescreen.org into your browser toolbar. Open a tool in one click, run the test, and understand what you're seeing. No separate downloads. No digging through settings menus. Pick a test and start. What you can test Color and pixel checks Color screens: white, black, red, green, blue, yellow, pink, light blue, and more Dead Pixel Test: find dead, stuck, and hot pixels Stuck Pixel Fix: cycle colors to try to unstick a pixel Color Accuracy: check color purity, gray balance, saturation, and skin tones Uniformity Test: spot uneven brightness and dirty screen effect Backlight Bleed: check for light leaking around the edges Motion and performance FPS Test: measure your browser's frame rate against a target Motion Test: look for blur and ghosting Response Time: check pixel response and overshoot Screen Tearing: see what tearing looks like and how sync tech helps Input Lag: visualize the delay between your mouse and your screen Clarity and resolution Sharpness Test: check lines, fringing, and moiré Font Clarity: check text rendering at different sizes Contrast and Gamma: check shadow and highlight detail Viewing Angle: see how color shifts off-center HDR Test: check highlight brightness, tone mapping, and wide color Monitor health Health Overview: a checklist that links to every test Monitor Detector: see your resolution, pixel ratio, color depth, and HDR status Utilities Camera Light, Screen Cleaning, White Video, and Pomodoro How it works Click the extension icon. Choose a tool. Go fullscreen and follow the on-screen steps. Each test comes with plain-language guidance on what to look for and what to do if something looks wrong. Good to know Browsers limit some tests. HDR, screen tearing, and input lag results can differ from what a native app or hardware tester shows. Each tool explains its limits, so you know how to read the result. Who it's for Anyone checking a new monitor, laptop, or phone before the return window closes Anyone troubleshooting a screen that looks off Anyone comparing displays or tuning settings Technicians and creators who need quick, repeatable checks Questions or feedback? Visit whitescreen.org/contact.