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Color & Calibration

White Screen

A pure white full-screen for cleaning, lighting, and uniformity.

▶ Start full-screen testTap for controls · Esc to exit

How to use

  1. 1Click Start for a full-screen pure white field.
  2. 2Look for dark dots (dead pixels) and smudges or dust.
  3. 3Press Esc to exit.

FAQ

What is a white screen used for?

Finding dark dead pixels and dust, checking brightness uniformity, lighting your face on video calls, and cleaning your display.

Will the screen stay on while I use it as a light?

Yes, in browsers that support the Screen Wake Lock API, which includes current Chrome, Edge, Safari and Firefox. The page asks your device to keep the display awake until you exit. Where the browser doesn't support it, your normal sleep timer applies.

Why does the white look slightly yellow or blue?

White depends on the display's color temperature. Night Light, Night Shift, True Tone and warm 'eye care' presets tint it on purpose, so turn them off before testing. Without those, an even warm or cool cast is a calibration difference, not a fault; patches of different tint across the screen are what to look for.

Tips

  • Great as a cheap softbox light for video calls in a dark room.
  • Dark specks that don't wipe off are usually dust between layers or dead pixels, not dirt.

Related tests

Color TestDisplay pure black, white, red, green, blue and more, full-screen.Open test→Black ScreenA pure black full-screen for backlight, dust, and OLED checks.Open test→Greyscale TestSmooth gradient and 32-step ramp to reveal color banding.Open test→Color GradientSmooth spectrum and RGB gradients to judge color transitions and banding.Open test→

Related guides

Learn more about what this test reveals and how to act on the results.

Blue Light, Night Mode, and Color TemperatureWhat color temperature does to your eyes and your color work, how night modes change it, and how to balance comfort against accuracy.How to Fix a Stuck Pixel: 4 Methods Worth TryingFlashing, the pressure method, and tapping — how to try each on a stuck pixel, how long to give it, the honest odds, and when to claim warranty instead.What Is PWM Flicker and How Do You Test for It?Many screens dim by flickering the backlight faster than you can consciously see — but your eyes may still feel it. Here's how to test yours.PPI and Pixel Density: How Sharp Is Sharp Enough?Resolution alone doesn't tell you how sharp a screen looks — pixel density and viewing distance do. Here's how to work out what you need.