UtilityBaseScreen Tools
Black Screen
Display a pure black screen to spot stuck pixels or rest your eyes.
Updated June 12, 2026
How to use the black screen
- 1Click the color area or the fullscreen button to enter fullscreen.
- 2Move the mouse or tap the screen to show or hide the toolbar.
- 3Use the brightness slider to dim the color if it is too intense.
- 4Press Esc or the exit button to leave fullscreen.
Common uses
- Reveal stuck pixels that glow against a black background.
- Check backlight bleed and black uniformity in a dark room.
- Blank a second monitor without unplugging it.
- Use as a dark, distraction-free screen saver substitute.
Frequently asked questions
How do I make my whole screen black?
Open the tool and press the fullscreen button (or the F key). The entire display turns black. Press Esc or F again to exit fullscreen.
Can I adjust the brightness?
Yes. Use the brightness slider in the toolbar to dim the screen without changing your system settings. This is a software dimmer applied on top of the color.
Will my screen turn off while the color is displayed?
The tool requests a screen wake lock in browsers that support it, which prevents the display from sleeping while the tool is active. If your browser doesn't support wake locks, adjust your system sleep settings for long sessions.
Does this work on phones and tablets?
Yes. On mobile, tap the fullscreen button to hide the browser interface where the platform allows it. Tap anywhere on the screen to bring the controls back.
How do I check backlight bleed with a black screen?
Enter fullscreen in a dark room and look at the edges and corners of an LCD panel. Cloudy bright patches on the black background indicate backlight bleed. OLED panels should look uniformly, completely dark.
About this tool
The black screen tool renders pure black (#000000) across your entire display. On a black background, stuck pixels — subpixels frozen in red, green, or blue — become immediately visible, which makes this the classic second step of a pixel inspection after the white screen. It is also useful for checking OLED black levels and backlight bleed on LCD panels (look at the screen in a dark room), for turning a secondary monitor into a non-distracting dark panel, and simply for resting your eyes. The tool runs fully in your browser and can keep the display awake while active.
Like everything on UtilityBase, the black screen runs entirely in your browser — nothing you enter is uploaded or stored on a server. It's free to use with no account required. Browse more screen tools here.
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