Make your screen black.

Make my screen black.
Make my screen white.
Make my screen green.
Make my screen blue.
Make my screen red.
Make my screen purple.

Why make my screen black

Save energy
Making your screen all black saves energy. This is especially true on OLED screens, where black pixels actually turn off.
As a prank
You can use this as a prank to pretend like the device is dead.
Check for dead pixels
A completely black screen makes it easier to spot dead pixels.
Stealth mode
When you're in a dark room and you want to temporarily switch off the display light, this can be easier than putting your device into standby mode.
You can use this to meditate. Feel free to play your favorite meditation song while you're at it.
Better than standby mode
You get most of the benefits of being in standby mode, with your apps still running in the background.
Check if screen is OLED
You can use this to check if your screen is an OLED one, as OLED screens don't emit light when set to black.
Use screen as mirror
Need to see who's behind you? A black screen can help you see reflections. Works better on glossy displays.
See the dust
Need to clean your screen, but don't want to turn it off? This will help you see all those dust particles.
Because it's cool
Impress your friends - or just use it to stay stylish. Black will never go out of fashion.

Frequently asked questions

Does it work on iOS devices?
Yes. We're using a workaround, since iOS does not support native browser fullscreen.
Does it work with multiple screens?
Does it prevent standby mode?
Yes - most browsers prevent the device from entering into standby when in fullscreen.
Does it work with multiple colors?
Yes, feel free to choose any of the colors available.
Why make my screen all black?
There are several reasons why you might want to make your screen black. Check the section above for some common examples.
I like this tool. How can I say thanks?
Bookmark this page for fast access and share it on social media to help it reach as many people as possible.
How does this work?
It uses some very basic Javascript. The method is called requestFullscreen(). Works with most browsers, including iOS ones.