Black Screen

Black Screen is a free browser-based display utility that instantly turns a monitor, phone, tablet, or smart TV into a pure fullscreen black screen. It is useful for checking dead and stuck pixels, inspecting backlight bleed and screen uniformity, reducing second-monitor glow, testing OLED displays, cleaning monitors, and creating distraction-free screen space.

The website also includes white, red, green, blue, yellow and other fullscreen colors, downloadable backgrounds, screensavers, fake update screens and additional display utilities. Everything runs directly in the browser with no signup or installation required.