Slide to 0% for pure black, or slightly higher for dim gray.
3
Go fullscreen
Click "Go Fullscreen" or press F11.
4
Exit anytime
Press ESC or click Exit.
Quick reference
At a Glance
Power saving
Only on OLED/AMOLED screens. LCD backlights stay on regardless.
Hot pixel test
Black background reveals pixels stuck in an "on" state.
Cost
100% free. No login, no ads, no tracking.
Exiting
ESC key, Exit button, or F11.
Mobile support
Works on iOS/Android — tap Go Fullscreen.
Privacy
All processing in-browser. Nothing uploaded.
Common questions
FAQ
An online black screen is a free browser tool that fills your display with pure black — no download needed. WhiteScreen.cc's black screen is used for OLED power saving, dead pixel detection, photography backdrops, and dark-room use.
Yes — but only on OLED and AMOLED displays (iPhones, Samsung Galaxy, many modern laptops). On OLED screens, black pixels are physically turned off. On LCD displays, the backlight stays on, so no power is saved.
Go fullscreen in a dark room. Any bright or coloured specks are hot or stuck pixels. Visit our Dead Pixel Test for a full guided multi-colour check.
No. This is an intentional tool you control — open and close at will. The Black Screen of Death is a Windows crash error requiring system troubleshooting.
Yes — fully responsive on iPhones, Android, and tablets. Tap Go Fullscreen to fill your screen.
Black Screen Online: Complete Guide
What is a pure black screen used for?
A black screen tool has several key uses. The most technically significant is OLED power saving — on OLED and AMOLED displays, black pixels are physically turned off, consuming virtually no power. This can reduce screen power draw by 40–60% compared to a white screen on the same device.
Black screen vs white screen: which do you need?
Use a white screen when you need to clean your monitor (smudges show against bright white), for photography with bright backgrounds, or for presentations. Use a black screen for hot pixel detection, OLED power saving, dark-room use, or dark video backdrops. Both are free on WhiteScreen.cc.
Using black screens for display quality testing
Professional display reviewers use pure black screens to test for:
Hot pixels — stuck bright pixels visible only against black
Backlight bleed — light leaking from LCD panel edges
IPS glow — hazy glow in corners of IPS LCD panels
Black uniformity — how evenly black the panel appears edge-to-edge