Full White Screen

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Fill your whole screen with pure white — perfect for spotting dead pixels, cleaning your monitor, a lightbox or a soft fill light. Free and runs in your browser.

Tap to open full screen

Pick a color

Press Esc to exit, or use the ← → arrow keys to switch colors while in full screen.

What is it for?

Find dead pixels
A solid field makes pixels that never light up easy to see — check each color in turn.
Find stuck pixels
On a black screen, sub-pixels stuck on bright stand out instantly.
Clean your screen
A bright, even white surface reveals dust, smudges and fingerprints as you wipe.
Lightbox & tracing
Turn your display into a backlight for tracing drawings or viewing slides.
Bias & fill light
Use a full color screen as ambient bias lighting or a soft fill light for calls.
Chroma-key backdrop
A pure green or blue screen works as a quick background for green-screen effects.

About Full White Screen

The Full White Screen tool fills your entire display with pure white (#FFFFFF) in one click. It is the classic first step of a dead pixel test: on a solid white field, any pixel that stays dark — dead or unpowered — stands out immediately, wherever it hides on the panel.

A bright, even white surface has plenty of uses beyond testing. It reveals dust, smudges and fingerprints while you clean your monitor, turns a tablet or laptop into an improvised lightbox for tracing drawings or checking negatives, and works as a soft fill light for video calls and quick photos.

The page runs entirely in your browser and is completely free. Once in full screen you can switch to black, red, green or blue with the arrow keys to continue a full pixel check, pick any custom color, and press Esc when you are done.

How to use Full White Screen

  1. Click the monitor preview or the "Go full screen" button to fill your display with white.
  2. Scan the screen slowly for dark spots — any pixel that stays black on white is a dead pixel.
  3. Use the ← → arrow keys to cycle through the other test colors without leaving full screen.
  4. Move the mouse to reveal the control bar, or press Esc to exit.

Frequently asked questions

Fill the display with white, clean the surface so dust isn’t mistaken for a defect, and scan the panel section by section from a normal viewing distance. A dead pixel shows as a persistent dark dot; repeat with red, green and blue to identify partially failed sub-pixels.

Yes — a full-brightness white background is the easiest surface on which to spot dust, streaks and fingerprints while wiping. Turn brightness up, clean with a dry microfiber cloth, and the remaining smudges become obvious against the even white field.

Yes. At maximum brightness a white screen works as a tracing lightbox for paper laid on a flat tablet, and as a soft fill light that flatters faces on video calls far more than a bare lamp.

It is completely free and runs entirely in your browser — the page simply paints your screen white, sends nothing to a server, and requires no account.

Press Esc to exit at any time. While in full screen, the ← and → arrow keys cycle through white, black, red, green and blue, and moving the mouse reveals a control bar with color swatches and a custom color picker.
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