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 fills your whole display with a solid block of colour. Pick white, black, red, green, blue or any custom colour, press Go full screen, then tap or hit the space bar to cycle through them. It uses the browser's Fullscreen API where that's allowed and falls back to a full-viewport overlay on iPhones and in-app browsers, so a plain white screen — or a full "white out" of the display — always reaches edge to edge.
If you keep seeing a white dot or white spot on your screen, cycling through solid colours is the quickest way to work out what it is. A stuck pixel shows as a single point that stays bright or one colour on every background, while a genuine dead pixel stays black. A white spot on a phone or laptop LCD that keeps the same bright blob through white, black, red, green and blue is usually physical damage to the panel or backlight, not a pixel — the tool can't repair that, but it tells you whether you're chasing a pixel fault or a hardware one before you pay for a fix.
A white screen also makes dust and smudges obvious for cleaning a monitor and works as a soft, even fill light for video calls and selfies, while a full black screen is best for spotting backlight bleed and clouding. Nothing is uploaded — it only colours your own screen, uses no camera and needs no sign-up.
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 are the white dots or white spots on my screen?
- They fall into two groups. A tiny white or coloured dot that changes with the background is usually a stuck pixel, which the colour cycle here can reveal. A fixed bright blob that stays white through every colour is normally physical damage to the LCD or its backlight, often from pressure, and needs a repair rather than software.
- How do I tell if a white spot on my phone screen is a stuck pixel or real damage?
- Go full screen and cycle through white, black, red, green and blue. A stuck pixel is a single point that stays lit or locked on one colour and blends into a matching background; a physical white spot stays the same bright mark on every colour. If it never changes with the background, it's almost certainly hardware, not a pixel.
- Can this tool fix a white spot on my mobile screen?
- It can't repair physical damage — a white blob caused by pressure or a failing backlight needs a screen replacement. It can help with stuck pixels: rapidly cycling colours over the spot sometimes unsticks them. Mostly it's a diagnosis tool, so you know whether a paid repair is actually worth it.
- 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.
- How do I make my whole screen white or "white out" the display?
- Leave the colour on white, press Go full screen, and it fills the entire display with plain white. On iPhone it uses a full-page overlay instead of true fullscreen. Tap the ✕ Exit button or press Esc to bring your desktop back.
- 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.