Handy tools
Black Screen
Pure black in full screen — spot backlight bleed and stuck pixels, or darken a spare monitor. No install.
Fill your whole screen with a pure, solid color in one click — white, black, red, green, blue and more. Handy as a soft light source, a background to hunt for dead or stuck pixels, a plain backdrop for photos and video, or to check screen cleaning and backlight bleed. No install, runs right in the browser.
Tip: click the screen or use the arrow keys to switch color, and press ESC to exit. Works best in full screen at 100% brightness.
Or pick a color
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Press Open full screen and your whole display turns pure black (#000000), with the browser switched to full screen where it allows it. Black is the background for checking an LCD in a dark room: with the brightness turned up, light seeping in at the edges or corners is backlight bleed, a hazy glow that shifts as you change your viewing angle is IPS glow, and a dot that stays lit is a stuck pixel.
A black screen is also a quick way to darken a display without switching it off, such as a second monitor during a movie, or to get a dark backdrop for a shoot. On an OLED panel, black pixels switch off, so the screen gives off almost no light and draws very little power. An LCD keeps its backlight on, so a faint glow remains and the power saving is negligible; turning the monitor off or letting it sleep does more.
Click or tap the screen to cycle through 9 solid colors: black, white, red, green, blue, cyan, magenta, yellow and gray. To look for OLED burn-in or image retention, switch to gray or white, since pixels that are off can't show it. On a keyboard, → ↑ or Space moves forward, ← ↓ goes back and ESC exits; the on-screen labels fade after about 2.5 seconds. Everything runs in the browser with nothing to install.
Frequently Asked Questions
Q. How do I make my screen completely black?
A. Press Open full screen: the page fills the display with pure black (#000000) and switches the browser to full screen. Press ESC or the Exit button to leave.
Q. How do I check for backlight bleed with a black screen?
A. In a dark room, turn the brightness up and look at the edges and corners. Bright patches creeping in from the edge are backlight bleed; a glow that moves when you change your viewing angle is IPS glow, which is normal on these panels to a degree.
Q. Can a black screen show OLED burn-in?
A. Not on black itself, because OLED pixels showing black are switched off. Tap the screen to switch to gray or white, then look for faint outlines of logos or the taskbar.
Q. Does a black screen save power?
A. On an OLED, yes: black pixels are off and draw almost nothing. On an LCD the backlight stays on, so the saving is negligible; turning the monitor off or using sleep mode works better.