Black screen

This page turns your display completely black (#000000). Go fullscreen with the button or F key, and press Esc to exit. Use it to dim a second monitor, hide your screen, save power on OLED, or check for stuck pixels and backlight bleed.

Color:

Tip: press F for fullscreen, Esc to exit. Keeps your screen awake while open.

Press Esc or tap to exit

Runs locally in your browser. Optional recordings and photos stay on your device; nothing is uploaded.

What this test can tell you

The page draws a solid color for you to inspect visually. Compare more than one background and distinguish a mark fixed to the display from something that moves with page content.

It does not automatically detect defects, measure color accuracy or repair a panel. Browser fullscreen, color settings, brightness and room reflections affect what you see.

How to use it

  1. Press “Open fullscreen” or the F key.
  2. Keep the page open while inspecting it. The browser may still dim or lock the screen depending on support and power settings.
  3. Use the timer to close it automatically.
  4. Press Esc, click or tap to exit.

Uses for a black screen

A black screen hides what is on your display during a break, darkens a second monitor while you watch a movie, and saves energy on OLED and AMOLED displays, where black pixels are switched off.

Testing your display

A black background can make bright dots or uneven light easier to notice. Compare viewing angles, room reflections and brightness before judging the result. LCD backlight glow and the appearance of black on other display types need different interpretation.

Not working? Try these fixes

I see light at the edges

Some backlight bleed or IPS glow is normal on LCD monitors, especially at high brightness. Lower the brightness and check again from straight on.

My whole PC shows a black screen, not just this page

That is a system problem rather than this tool. Press Windows + Ctrl + Shift + B to reset the graphics driver on Windows, or restart your device.

The mouse pointer stays visible

Move it to a corner. In fullscreen the pointer hides after a few seconds of no movement.

Frequently asked questions

Does a black screen save battery?

On OLED and AMOLED screens, yes — black pixels are turned off. On LCD screens the backlight stays on, so the saving is small.

Can I use it to turn off my second monitor?

It makes the monitor dark without changing your display settings. To save the most power, turn the monitor off.

What is the color code?

Pure black: #000000 or RGB(0, 0, 0).

Methods and reference documentation

Related tests

White screenOpen a white light or inspect dark marks on the display. Dead pixel testCycle solid colors to inspect persistent bright or dark dots. Color screenChoose a solid color or enter a custom HEX value. Refresh rate testEstimate browser animation timing and compare visible motion.