White Screen, full screen and free
One tap to a pure #FFFFFF display, with brightness, a timer and a dead pixel cycle.
Escape or one tap comes back.
Every colour, one tap away
- #FFFFFF White screen
- #000000 Black screen
- #FF0000 Red screen
- #00FF00 Green screen
- #0000FF Blue screen
- #FF00FF Pink screen
- #FFFF00 Yellow screen
- #00FFFF Cyan screen
- #800080 Purple screen
- #808080 Grey screen
Brightness, timer and colour cycle
A white screen, without the clutter
This is a white screen that fills your entire display in one tap. No sign up, no download, no advertisement covering the thing you came for. Press the button above and every pixel on your monitor, laptop, tablet or phone goes to #FFFFFF, the brightest white the panel can produce. Press Escape or tap once to come back.
Most people arrive here for one of five reasons, and the tool is built for all of them rather than for the first one. You are cleaning a monitor and need a bright, even field so the dust and finger marks actually show up. You are checking a screen for dead pixels, either on hardware you own or on something you are about to buy secondhand. You need a soft light for a video call and the room has gone dark. You are tracing a drawing through a sheet of paper taped to a tablet. Or you want a blank, distraction free surface to calibrate something against.
What this does that a plain white page does not
There are a dozen pages on the web that paint the browser white. Almost all of them stop there, and stopping there is the problem, because a flat white rectangle answers only the simplest version of the question.
Brightness. The slider scales the colour down towards black, so you can sit at 30 percent white for late night work or fill light without turning your monitor down and losing the setting. It works on every colour, not just white.
A timer. Set 30 seconds, a minute, five or fifteen, and the screen closes itself. Useful if you are using the display as a lamp while your hands are busy, and genuinely important on an OLED panel, where hours of static full white contributes to burn in.
A colour cycle. Finding a dead pixel means looking at the same area on white, black and each primary in turn, because a pixel that is dead on white may look fine on red. The cycle steps through nine full screen colours automatically at a speed you choose, so you can keep your eyes on the panel instead of on a mouse.
Every colour on one grid. White, black, red, green, blue, cyan, magenta, yellow, purple and grey, each with its hex code printed underneath, each one tap from here and each with its own page explaining what it is good for.
Which colour to use for what
White finds dark faults: dead pixels, dust, smears, scratches in a coating. Black finds bright faults: stuck pixels, backlight bleed at the edges, clouding across the middle, and on an OLED it shows you whether black is genuinely black. Grey at 50 percent is the field professional reviewers use for uniformity, because the eye compares mid tones far more accurately than it compares extremes.
The three primaries do something different again. Each pixel on your screen is three subpixels, one red, one green and one blue. A full screen red lights only the red ones, so a subpixel that has failed shows as a black dot on red while looking perfectly normal on white. That is why the cycle runs all of them, and why a single white screen is not a real dead pixel test.
Testing a screen before you buy it
If you are meeting someone to buy a used monitor, laptop or phone, this page is the five minute check that saves the purchase. Open the white screen and look for black dots and for cloudy patches. Open black and look for bright dots and for light leaking from the edges. Run the cycle and watch one quadrant at a time. Then open the screen resolution test to confirm the panel really is the resolution the listing claimed, and the refresh rate test to confirm the 144hz in the advert is 144hz in practice.
Do it in a room you can darken, hold the screen at a normal working distance rather than pressing your face to it, and look at each area rather than sweeping. Almost every fault worth walking away from is visible in under five minutes this way.
It runs in your browser, and that is the whole architecture
Every test here is a few kilobytes of JavaScript painting colours and measuring frames. Nothing is uploaded, nothing is stored, no account exists to sign into. The refresh rate readout is your own browser timing its own frames. The resolution readout is your own browser reporting its own display. Both stay on your machine.
That also means it is fast. The page is static, it works offline once loaded, and it does not ask for a camera, a microphone or a location. A screen test tool has no business wanting any of those.
When the problem is not a pixel
Not everything that looks wrong on a screen is a pixel fault, and the fix depends entirely on which it is. A blurred white patch that stays put on every colour is usually pressure damage to the backlight diffuser. A thin vertical or horizontal line running the full height or width is a failed row or column driver, not a pixel. A phone or laptop that boots to a blank white screen and goes no further is a software or connector problem, not a display fault at all. Each of those has its own guide on this site, written to tell you which one you are looking at before you spend money.
Frequently asked questions
What is a white screen used for?
Five things, mostly. Cleaning a monitor, because dust and smears are invisible on a dark desktop and obvious on a white field. Finding dead pixels, which show up as black dots on white. Using a laptop or phone as a soft fill light on a video call. Tracing a drawing by taping paper to a tablet. And testing a screen you are about to buy secondhand, before you hand over the money.
How do I make my whole screen white?
Press the big button at the top of this page. The browser goes full screen and fills every pixel with pure white. There is nothing to install and no account. Press Escape, or tap once anywhere on the white, to come back.
Is this really pure white, or is it slightly grey?
It is #FFFFFF, the maximum value in all three channels, which is the brightest your panel can produce. The hex code is printed under every colour chip so you can check. If it looks grey or blue to you, that is your display profile or night light setting, not the page.
Can I change the brightness of the white screen?
Yes. The brightness slider scales the colour down towards black in steps of 5 percent, so at 40 percent you get #666666 rather than white. This reduces the light the panel emits, which matters if you are using it as a lamp at night or your monitor is already at minimum. It is separate from your operating system brightness, so the two stack.
How do I check my monitor for dead pixels?
Open the dead pixel test and let it cycle through all nine colours. A dead pixel stays black on every colour. A stuck pixel stays one colour, usually red, green or blue, on every screen including black. Look at the screen from about 50 centimetres and scan it in strips rather than trying to take it in at once.
What is the difference between a dead pixel and a stuck pixel?
A dead pixel receives no power, so it is black on every colour and cannot be fixed by software. A stuck pixel is permanently on in one or more subpixels, so it shows as a bright red, green, blue, cyan, magenta or white dot. Stuck pixels sometimes free themselves, which is what the stuck pixel fixer tries to do.
Can a white screen fix a stuck pixel?
A static white screen will not. Rapidly alternating red, green and blue sometimes will, because it forces the subpixel transistors to switch many times a second. The stuck pixel fixer on this site does exactly that. Leave it running over the affected area for 10 to 20 minutes. It is not guaranteed, and it does nothing at all for a truly dead pixel.
How do I clean my monitor screen safely?
Turn the monitor off, or open the black screen so you can see what you are removing. Use a dry microfibre cloth first. For anything that does not lift, dampen the cloth with distilled water, never spray liquid directly at the panel, and never use glass cleaner, alcohol or paper towels on a matte or OLED coating. Finish with the white screen to check for streaks.
Why does my laptop screen have white spots?
Usually pressure damage to the backlight diffuser, often from closing the lid on a crumb or a cable, or from gripping the screen by its face. Unlike a stuck pixel, a white spot is a blurred patch rather than a single dot, and it stays in the same place on every colour. It is a hardware fault and no software fixes it.
Does a white screen damage an OLED display?
A few minutes will not. Hours of a static full white image, repeated daily, contributes to burn in because OLED pixels age with use and white drives all three subpixels at full power. If you are on an OLED panel and want a long session, drop the brightness slider and use the timer so the screen closes itself.
How do I use a white screen as a light for video calls?
Open the white screen on a second device, a phone or tablet, and stand it just behind and above your webcam. Use the brightness slider rather than your face, because a screen at full white 30 centimetres away is unflattering. If the light looks too blue on camera, the colour chips give you warmer options.
How do I exit full screen?
Press Escape, or tap once anywhere on the colour. The control bar in the bottom right corner also has an Esc button, and it fades out after a couple of seconds so it is not sitting on top of what you are inspecting. Move the mouse or press any key to bring it back.
Does this work on a phone or tablet?
Yes, and it is designed phone first. On iPhone, Safari refuses the full screen API, so the page covers the viewport with a fixed overlay instead and you keep a thin strip of browser chrome. Everywhere else, including Android Chrome and iPad Safari, you get the entire display.
How do I test for backlight bleed?
Open the backlight bleed test in a dark room, with the monitor at or near full brightness, and give your eyes a minute to adjust. Light leaking in from the edges or corners is bleed. A general cloudy glow across the panel is clouding, and a glow that changes as you move your head is IPS glow, which is normal and not a fault.
What is screen uniformity and how do I check it?
Uniformity is how evenly a panel lights the same colour across its whole surface. Open the screen uniformity test, which steps through several flat grey fields, and look for patches that read warmer, cooler or dimmer than their surroundings. Grey shows it far better than white does, because white saturates the eye.
Do you store anything about my screen?
No. Every test on this site runs in your browser. The refresh rate and resolution readouts are measured locally and never sent anywhere, there is no account, and nothing you do here is recorded against you.