White Screen
White Screen fills your display with pure white — or any colour — for spotting dead pixels, cleaning your monitor, checking backlight bleed, or using your screen as a soft fill light.
Full-screen white or colour test screen.
How to use White Screen
- Pick a screen colour, or choose Custom for any colour.
- Press “Go full screen”.
- Tap the screen (or press Space / the arrow keys) to cycle through the colours.
- Press Esc, or tap ✕ Exit, to leave full screen.
About White Screen
White Screen turns your whole display into a solid block of colour. Pick white, black, red, green, blue (or any custom colour), press Go full screen, then tap or press the space bar to cycle through them. It uses the browser's Fullscreen API where available and falls back to a full-viewport overlay on iPhones and embedded browsers, so it always fills the screen edge to edge.
A plain white screen makes dust and smudges obvious for cleaning a monitor, and doubles as a soft, even fill light for video calls, selfies and close-up photography. Cycling white → black → red → green → blue is the standard way to find dead pixels (always off, usually black) and stuck pixels (locked on one colour) — they show up as tiny dots that don't match the rest of the screen. A full black screen is best for checking an LCD for backlight bleed or clouding in a dark room.
Frequently asked questions
- How do I test my screen for dead pixels?
- Go full screen and tap to cycle through white, black, red, green and blue. On each solid colour, look for tiny dots that stay a different colour — those are dead or stuck pixels. A dark room and a clean screen make them easier to spot.
- What's the difference between a dead pixel and a stuck pixel?
- A dead pixel stays off (black) on every colour, while a stuck pixel is locked on one colour — for example always red or bright white. Stuck pixels can sometimes be revived; dead pixels usually cannot.
- Can I use it as a fill light for video calls or selfies?
- Yes. Set the screen to white (or a warm custom colour), turn your brightness up, and face it — it gives a soft, even light with no hardware. It works as a cheap key or fill light for webcams and phone cameras.
- Why won't it go full screen on my iPhone?
- iOS Safari blocks the Fullscreen API for regular elements, so the tool falls back to an overlay that covers the whole page instead. Tap the screen to change colour and tap the ✕ Exit button (top-right) to leave.
- Which colour is best for cleaning a monitor?
- White shows dust, lint and smudges most clearly, so it's the usual choice for cleaning. A black screen is better for spotting scratches and for checking backlight bleed.
- Does a black screen save battery?
- On OLED and AMOLED displays, yes — black pixels are switched off, so a black screen uses less power. On a normal LCD the backlight stays on regardless, so it makes little difference.
- Is anything uploaded or recorded?
- No. The tool just colours your own screen — it uses no camera, sends nothing anywhere, and needs no sign-up.