Black Screen

A full black screen dims or blacks out a display, rests your eyes and cuts glare, and works as a test pattern. Stuck or bright pixels glow as colored or white dots against pure black, so they are far easier to find than on a bright field. In a dark room the same screen exposes backlight bleed and IPS glow around the edges of an LCD panel. On an OLED the black pixels switch off entirely, so a healthy panel should look completely lightless.

To make your whole screen black, open this black screen tool and press the Go Full-Screen Black button, or tap the black swatch. The page fills your entire display with solid black and hides the browser interface. Once you are full-screen, the left and right arrow keys switch between black, white, red, green, blue and gray. Press Esc to exit.

On an OLED or AMOLED display, black pixels are switched off, so a full black screen draws less power and gives off no light. On a normal LCD the backlight stays lit behind the panel, so black dims the picture but saves little power. A static black field is also the one image that puts no wear on OLED subpixels, which makes it safer to leave on screen than a bright static image.

The black screen switches to any of the other solid colors. Pick a swatch before you start, or once full-screen use the left and right arrow keys or the on-screen swatches to move between black, white, red, green, blue and gray. Pair it with the white screen tool, because dead pixels that stay black only show up against a bright field. For a full palette with a custom hex value, open the color screen tool.

The black screen tool uploads nothing and needs no install. It runs entirely in your browser, with no account, no download and no data leaving your device. Once the page has loaded it keeps working offline, so it still works on a machine with no connection. Closing the tab removes it completely.