White Screen

Fill your screen with pure white — a soft light for video calls, a lamp in a pinch, or a quick check for dust and stuck pixels. Slide the lightness down when full white is too much.

For the strongest light, turn your screen brightness all the way up.

What a White Screen Is Good For

A screen showing pure white is simply a big, soft light — and that turns out to be useful far beyond testing. Here is what people use this page for.

Light for video calls

On a video call, the light in the room often comes from behind or above you, leaving your face in shadow. Open this page, make the screen white, turn the brightness up and face it — the screen becomes a soft panel light that evens out your face without the harsh glare of a desk lamp.

Fill light for photos

Photographers use big white surfaces to bounce soft light into shadows. A laptop or tablet showing this page works the same way for close-up shots and small objects.

A lamp in a pinch

A white screen at full brightness makes a surprisingly good reading or bedside light — soft, even and instantly adjustable. Slide the lightness down if bright white feels too harsh late in the evening.

Spot dust and stuck dots

Specks of dust, smudges and stuck dots all hide on a busy desktop but stand out instantly on a plain white background. Go fullscreen, wipe the screen, and anything that stays put is on the panel itself — a colored dot that never moves may be a stuck pixel worth testing properly.

Check brightness evenness

A full white screen makes uneven brightness easy to see: darker corners, a yellowish patch, or a stripe that looks dimmer than the rest. If everything looks smooth and even, your backlight is doing its job.

Test for dead pixels properly
Cycle through solid colors to find dead, stuck or hot pixels — and learn which is which.
Start the check
See your screen in the dark
A pure black screen in a dark room shows whether light leaks from the edges of your display.
Check backlight bleed

Frequently asked questions

Click the big white area or the button below it — white fills your whole screen. Scroll with the mouse or swipe up and down on a touchscreen to make the light dimmer or brighter (or set it with the slider beforehand), and press Escape or the small close button when you are done.
No. Showing a single color is completely normal use — no more demanding than any web page. Even on OLED screens, which can age if the exact same bright image stays up for many hours every day, using a white screen for minutes or even a few hours at a time is nothing to worry about.
Screen light is soft and spread out, so it flatters your face instead of casting hard shadows the way a small bright lamp does. White gives the most natural skin tones; turn your screen brightness to maximum for the strongest effect.
Yes — drag the slider under the preview, or scroll or swipe up and down while the light is fullscreen, to dim the white all the way down to black. Handy at night when full white is blinding. This page keeps to white on purpose: it is a light, not a test pattern. If you need solid red, green or blue screens, the dead pixel test cycles through them.
Usually a comfort feature is warming your screen on a schedule — Night Shift on a Mac or iPhone, Night Light on Windows and Android. Turn it off and compare. If one area of the screen stays yellowish while the rest is white, that tint lives in the panel itself.
Look at the white screen and note any dot that stays dark, then slide the lightness down to black and look for dots that stay lit or colored. A dot that never changes with the background is a dead or stuck pixel — the dead pixel test above walks through every color and tells you which is which.
Yes to both. The page is free, there is nothing to install, and everything happens right in your browser — nothing about you or your screen is sent anywhere.