White Screen Online – Full Screen White
Click the white area or press F to fill your whole screen with pure white. It shows dead pixels as black dots, makes dust and smudges easy to spot and reveals uneven brightness. For stuck pixels, also run the black screen and the red, green and blue screens.
Click to fullscreen or press F/Space
Resolution Settings
Presets
Keyboard Shortcuts: Press F or Space for fullscreen, ESC to exit
Found a stuck pixel? Try to revive it with the Dead Pixel Fixer
How to Use This Tool
What is this Test?
A full white screen (#FFFFFF) drives every red, green and blue subpixel at full power, so the whole panel is as bright as it can get. That makes it the best background for three checks: dead pixels, which show up as black or dark dots because none of their subpixels light; dust, smudges and scratches on the surface, which catch the light; and brightness uniformity, because a white field shows every darker corner, warmer patch or vertical band. It is also the easiest way to see whether your white point looks neutral, bluish or yellowish.
What a White Screen Reveals
- Dead pixels: a pixel with no working subpixels stays black. On white it is the most visible defect there is, even when it is only a fraction of a millimetre.
- Dust and debris: specks on top of the glass move or disappear when you wipe them. A speck that stays put after cleaning, and looks sharp at any viewing angle, is inside the panel.
- Brightness uniformity: edges or corners that are noticeably darker than the centre, or a gradient from one side to the other. Some fall-off of 10 to 20 percent is normal on LCD monitors and hard to see in daily use.
- Dirty screen effect and banding: faint vertical or horizontal stripes, or a blotchy texture, most visible when you move a white window slowly across the screen. Common on large TVs and VA panels.
- Color tint: one half of the screen looking slightly pink and the other slightly green is a uniformity problem in the backlight or panel, not a setting.
Cleaning Your Screen With It
- Switch to white and full screen: every fingerprint and streak shows clearly against the bright background.
- Wipe gently: use a dry microfibre cloth first, then one lightly dampened with distilled water. Never spray liquid directly onto the screen.
- Avoid alcohol and glass cleaner: on matte and anti-glare coatings they can leave permanent marks. Check your manufacturer before using anything stronger than water.
- Check again on black: white shows dust and fingerprints, black shows streaks left behind by the cloth.
Testing Tips
- •Set brightness to the level you normally use. At maximum, uniformity problems look worse than they are in practice; at minimum they hide.
- •Let the monitor warm up for 15 to 20 minutes before judging uniformity or tint. The backlight changes slightly as it reaches working temperature.
- •Sit straight in front of the screen at your normal distance. On IPS and VA panels the edges look darker from an angle even when the panel is fine.
- •If you are unsure whether a dot is a dead pixel or dust, take a close-up photo, wipe the screen, and take another photo from the same spot.
- •Avoid staring at a full white screen in a dark room for long. It is very bright and tiring for your eyes.
Keyboard Shortcuts
How this test works
The page asks your browser to show one element in full screen and colors it pure white (#FFFFFF), with nothing else on top: no browser bars, no taskbar, no cursor once you stop moving it. The Download button draws the same color into an image at the resolution you choose and saves it as a PNG on your device.
Pro Tip: White finds dead pixels but can hide stuck ones: a pixel stuck on red, green or blue still contributes to white and blends in. Run the black screen and the red, green and blue screens as well, or use the Dead Pixel Test, which cycles through all of them for you.
Frequently Asked Questions
How do I make my whole screen white?
Click the white area or press F or Space. The page switches to full screen and hides the browser bars and taskbar. Press Esc to go back. On an iPhone, Safari doesn't let web pages go full screen, so the address bar stays visible.
Can a white screen fix a dead pixel?
No. A white screen only helps you find dead pixels. A dead pixel has no working subpixels, so nothing on the screen can switch it back on. If a dot is colored rather than black, it is a stuck pixel, and the Dead Pixel Fixer may help.
Why does my white screen look blue or yellow?
Usually because of a setting, not the panel. Night Light on Windows, Night Shift and True Tone on Apple devices, and the monitor's own color temperature preset all shift white towards yellow or blue. Turn them off before judging the white point.
Why are the edges darker than the middle?
Most LCD monitors are a little dimmer at the edges and corners, because of how the backlight is spread across the panel. A gentle fall-off is normal. A clearly darker band or patch that you also notice in everyday use is worth reporting while you can still return the monitor.
Is it bad to leave a white screen on for a long time?
On an LCD it does no harm. On an OLED, an evenly white image wears all pixels at the same rate, so it does not cause burn-in the way a static logo does, but it runs the panel at high power and heat. Keep sessions short and brightness moderate.
Can I use a white screen as a light?
Yes, a bright white screen makes a soft fill light for photos and video calls. For calls, the Video Call Light page adds warm and cool presets and a brightness slider, which usually looks more natural than pure white.
Written by R. Ottens, front-end developer & image editing specialist.