Yellow Screen

Press Go full screen to fill your screen with yellow, or pick a warmer or paler yellow first.

Colour Pick one, then go full screen.

What to look for

F goes full screen. Escape leaves.

Pure yellow

Pure yellow

#FFFF00 · 93 percent of full light

#FFFF00. Two sets of sub-pixels work here, red and green, while blue rests. Together they give about 93 percent of what full white gives, more than cyan or magenta, the other two-color mixes.

The page's own dimmer, not your device's brightness.

What to look for

Checking the screen on yellow

Pale yellow, white and warm light

Next step Now look at the same panel on plain black

How it works

This yellow screen fills your display with pure yellow, #FFFF00, in one press. A screen makes yellow from red and green with blue off, so a faulty sub-pixel shows here as a white, red or green dot.

Read the full guide

Yellow full screen in one press

1. Keep pure yellow, or pick gold for a warmer yellow and light yellow for a paler one. 2. Press Go full screen. 3. To check the display, look close for a dot of another color.

What the pale yellows show

Light yellow is white with only blue lowered, from 255 to 224, and lemon chiffon lowers it to 205. Show one beside a white window: you should see a faint cream.

Questions and answers

What is a yellow screen test for?

It checks the red and green sub-pixels together and the blue ones for staying dark. Faults that hide on white can show on yellow, and an uneven yellow shows where red and green are out of balance.

What does a dot on a yellow screen mean?

A white dot is a blue sub-pixel stuck on. A red dot is a green sub-pixel that stays off, and a green dot is a red one that stays off. A black dot means both are off.

Which shade makes a bright yellow screen?

Pure yellow, #FFFF00, the shade the page opens on. Of the colors made by switching whole sub-pixels on, it is the brightest after white. CSS has no color named neon yellow: for a neon yellow screen keep pure yellow and raise the device's own brightness.

Can I use it as a yellow light screen?

Yes. Pure yellow keeps red and green lit and drops only blue, so it gives about 93 percent of white's light: a warm fill light for a photo or a call. For a light yellow screen, close to white, pick light yellow, #FFFFE0.

Why does my white screen look yellow?

Often a night mode or a warm color temperature setting. Both lower blue, and white with less blue is pale yellow, like the light yellow on this page. Turn them off and look again.

All 16 shades and checks

Yellows, pure to pale 8

  • Pure yellow #FFFF00. Two sets of sub-pixels work here, red and green, while blue rests. Together they give about 93 percent of what full white gives, more than cyan or magenta, the other two-color mixes.
  • Gold #FFD700: a deeper yellow that drifts toward amber, made by easing green down to 215 while red stays at 255. It gives roughly 70 percent as much as a white field.
  • Khaki #F0E68C: a sandy yellow with blue lit at 140 of 255, at about 77 percent of white's light. Soft enough to look at for a while as a backdrop.
  • Dark khaki #BDB76B: an olive-tinged yellow at about 46 percent of white's light, the darkest shade here. It keeps a yellow cast without lighting up the room.
  • Pale goldenrod #EEE8AA: a pale straw yellow at about 79 percent of white's light. Blue sits at 170 of 255, two thirds of the way to white.
  • Lemon chiffon #FFFACD: almost white, with green at 250 and blue at 205 of 255, about 94 percent of white's light. A cream that shows whether your screen holds a faint yellow apart from white.
  • Light goldenrod #FAFAD2, which CSS names lightgoldenrodyellow: red and green at 250 and blue at 210 of 255, about 93 percent of white's light. Paler than it sounds, and close to lemon chiffon.
  • Light yellow #FFFFE0: pure white with blue lowered from 255 to 224 and nothing else changed, about 98 percent of white's light. The faintest yellow on the page.
Show all 16 shades and checks (8 more)

Checking the screen on yellow 4

  • How a screen makes yellow A screen has no yellow sub-pixels. It makes yellow by lighting red and green together and leaving blue dark. That is why a fault looks different here than on red, green or blue, where one sub-pixel works alone.
  • A white point on yellow: blue stuck on On pure yellow the blue sub-pixels are the only ones off. One that is stuck on completes the mix, so that pixel shows white. It is a small bright point, easiest to see close up.
  • One sub-pixel dark: the speck shows the other color Yellow minus green leaves red, and yellow minus red leaves green. A red speck therefore marks a green sub-pixel that never lights, a green speck marks a red one, and a black speck marks both.
  • Yellow that turns greenish or orange An even yellow needs red and green in the same balance everywhere. An area that leans green or orange toward one edge shows the two are not balanced there. Look at it from where you normally sit.

Pale yellow, white and warm light 4

  • The pale yellows are white with less blue Light yellow is white with blue at 224 of 255, and lemon chiffon lowers it to 205. They show what turning blue down does to white: first cream, then yellow.
  • What a night mode does to white A night mode shows warmer colors by cutting blue light, so with one on, plain white takes on a tint like these pale yellows. If your white looks like lemon chiffon at midday, look for a night mode or a warm color temperature setting.
  • Is light yellow different from white here? Put a white window next to this one. Light yellow differs from white by 31 levels of blue and nothing else, and should read as faint cream. No visible difference means the top of the blue channel is being flattened.
  • A warm fill light nearly as bright as white Pure yellow gives about 93 percent of white's light, because it keeps the green and red sub-pixels and drops only blue. As a fill light for a photo or a call it is warm and almost as bright as a white screen.

How this list was compiled: Shades, checks and uses chosen and written for this page. Every hex value is a CSS named color, taken from the table of named colors at https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Values/named-color, read 2026-10-02. The share of light printed for each shade is its relative luminance (0.2126 R + 0.7152 G + 0.0722 B on linear values, pure white as 100), worked out from the formulas at https://en.wikipedia.org/wiki/SRGB, read 2026-10-02. That a pixel is made of three sub-pixels, that a dark dot is one that stays off and a stuck sub-pixel one that stays lit, is from https://en.wikipedia.org/wiki/Defective_pixel; that red and green light make yellow, red and blue magenta, green and blue cyan, and all three white, is from https://en.wikipedia.org/wiki/RGB_color_model; both read 2026-10-02. That a night mode shows warmer colors by reducing the blue light of the display is from https://en.wikipedia.org/wiki/Night_Shift_(software) and https://support.microsoft.com/en-us/windows/set-your-display-for-night-time-in-windows-18fe903a-e0a1-8326-4c68-fd23d7aaf136, read 2026-10-02. A color on a screen is not a match for paint, print or another screen, and nothing here is a measurement. Licence: own work

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