Energy saving on OLED & AMOLED displays
True black pixels on OLED and AMOLED screens switch off entirely, which can meaningfully reduce power draw compared with bright images or white pages. Great for phone screens and modern laptop displays.
What is this tool?
OLED savings, dead pixel tests, monitor cleaning, and focus mode.
Use a pure black screen to let OLED and AMOLED pixels power off completely, saving battery. Cycle through solid colors to expose stuck or dead pixels. A flat white or black screen makes dust and smudges visible for safe monitor cleaning. Or go fullscreen for a distraction-free focus environment. Free, instant, works on any device.
Open color controls
Shortcuts: B, W, R, G, L, P, Esc
Why people use a black screen
A simple tool with surprisingly practical uses
Dead pixel and panel testing
Cycling through solid colors helps reveal stuck pixels, backlight inconsistencies, tint shifts, and uneven brightness across any display — laptop, monitor, phone, or TV.
Cleaning your monitor safely
A flat color background makes dust, fingerprints, and smudges far easier to see before and during cleaning. White and black screens are especially useful for spotting different types of marks.
Focus and ambient setup
A distraction-free fullscreen color can dim your workspace, hide clutter on shared screens, or create a minimal background for photos, video calls, and presentations.
Frequently asked questions
Everything you need to know before going fullscreen
Does this tool create a true fullscreen black screen?
Yes. On supported browsers it requests native fullscreen mode so the entire display is covered — no address bar, no taskbar. If a browser blocks fullscreen, the app falls back to an edge-to-edge overlay that still covers the entire visible viewport.
How do I exit fullscreen?
Press Esc, tap or click the screen, or wait for the auto-exit timer if you enabled one before starting your session. The timer options are 5, 10, or 30 minutes.
Does a black screen save battery on OLED phones?
Yes. On OLED and AMOLED displays, individual pixels are self-lit — a true black pixel is powered off entirely. Using a fullscreen black screen can noticeably reduce battery drain compared with a bright white or colorful screen.
Can I use this to find dead or stuck pixels?
Absolutely. Enable Color Cycle mode and the tool rotates through all six solid colors every second. Dead pixels usually appear as fixed-color dots, while stuck pixels show as the wrong color against each background.
Why is blue mapped to the L key?
The shortcut set avoids conflicts: B for black, W for white, R for red, G for green, L for blue (B is taken), and P for purple.
Does it work on iPhone and iPad?
iOS Safari has limited fullscreen API support for normal webpages, so the app switches to a fullscreen-like fixed overlay fallback and locks scrolling for the best possible effect on Apple mobile devices.
Is this tool free to use?
Yes, completely free. No account, no download, no subscription. It works entirely in your browser and can even be installed as a PWA for offline use.
What is the color cycle mode for?
Color cycle mode rotates through all six colors every second, making it useful for dead pixel testing, quick display diagnostics, panel uniformity checks, and showroom or repair-shop screens.