#FDFE21

sRGB: 253 / 254 / 33

#FDFE21 belongs to the yellow family. Its hex code tells a screen to mix 253 red, 254 green and 33 blue on a scale of 0 to 255. On the HSL wheel, hue is a position around a circle: 60.3° lands in the yellow region. Its 99.1% saturation makes it strong in color at this lightness. HSL lightness is 56.3% on a scale from black (0%) to white (100%). Of black and white lettering, black has the clearer light-to-dark separation on this background (19.38:1), which helps the shapes of letters stand out.

Color conversions

sRGB (8-bit): 253, 254, 33
HSL: 60.27°, 99.10%, 56.27%
HSV / HSB: 60.27°, 87.01%, 99.61%
CMYK (approx.): 0.39%, 0.00%, 87.01%, 0.39%
CIE XYZ (D65, Y = 100 for white): 76.222, 91.877, 15.158
CIELAB (D65, 2° observer): 96.770, -21.541, 90.783
WCAG relative luminance: 0.91876
24-bit decimal: 16645665

CMYK uses a profile-free approximation. Printed output depends on the press, ink and paper. Lab uses a D65 white point.

Text contrast

Contrast tells you how clearly lettering separates from #FDFE21 in light and dark. The ratio compares relative luminance, a measure of light weighted for human vision. Identical colors give 1:1 and black against white gives 21:1. A ratio of 2.99:1 falls just below the 3:1 AA minimum for large text. Body text needs at least 4.5:1 because its finer strokes are harder to distinguish.

Black text: 19.38:1

Normal text: AAA
Large text: AAA

White text: 1.08:1

Normal text: Fail
Large text: Fail

AA and AAA are WCAG accessibility levels. AAA sets a higher bar: 7:1 for normal text and 4.5:1 for large text. Large text begins at 18 pt regular or 14 pt bold. Ratings use the unrounded ratio.

Reference: WCAG text contrast guidance

Palettes & scales

Harmonies rotate the hue. Scales mix the starting color with white, black or middle gray in 20% steps in encoded sRGB.

Complementary

#2221FE sits half a turn (180°) from #FDFE21 on the HSL wheel. Keeping saturation and lightness steady while crossing to the opposite hue gives you a contrasting accent. Check text contrast separately before using the pair for lettering.

#FDFE21 #2221FE

Analogous

#FE9021 and #8FFE21 sit 30° to either side of #FDFE21. The three hues are neighbors on the wheel, so you can change the color of a border or highlight while keeping it close to the original.

#FE9021 #FDFE21 #8FFE21

Triadic

#FDFE21, #21FDFE and #FE21FD are spaced 120° apart, forming a triangle on the wheel. Try one for the main color and the other two for accents.

#FDFE21 #21FDFE #FE21FD

Split complementary

Start at #FDFE21 and look across the wheel. #218FFE and #9021FE sit 30° to either side of its exact opposite, giving you two different accent choices.

#FDFE21 #218FFE #9021FE

Square

Starting with #FDFE21, each quarter turn (90°) takes you to the next hue: #21FE90, #2221FE, then #FE218F. Across the square, #FDFE21 pairs with #2221FE, and #21FE90 with #FE218F.

#FDFE21 #21FE90 #2221FE #FE218F

Tetradic

#FDFE21 and #2221FE are opposites, as are #21FE22 and #FE21FD. Together they form a rectangle on the wheel, with alternating gaps of 60° and 120°.

#FDFE21 #21FE22 #2221FE #FE21FD

Tints

Mixing #FDFE21 with white in 20% steps produces this scale. The first mixture, #FDFE4D, keeps 80% of the original. By #FFFFD3, the mixture is 80% white.

#FDFE21 #FDFE4D #FEFE7A #FEFFA6 #FFFFD3 #FFFFFF

Shades

Mixing #FDFE21 with black in 20% steps produces this scale. The first mixture, #CACB1A, keeps 80% of the original. By #333307, the mixture is 80% black.

#FDFE21 #CACB1A #989814 #65660D #333307 #000000

Tones

Mixing #FDFE21 with middle gray in 20% steps produces this scale. The first mixture, #E4E534, keeps 80% of the original. By #99996D, the mixture is 80% middle gray.

#FDFE21 #E4E534 #CBCC47 #B2B25A #99996D #808080

Copy color codes

Hex, RGB and HSL are three ways to write this screen color. Paste any of them into a CSS color property.

Hex

#FDFE21

RGB

rgb(253 254 33)

HSL

hsl(60.271 99.103% 56.275%)

CSS example

.color-sample {
  background-color: #FDFE21;
  color: #000000;
}

Channel breakdown

RGB

#FDFE21 uses 253 red, 254 green and 33 blue. Each bar shows how much of that channel’s 0–255 range the screen uses.

Red 99.2%

Green 99.6%

Blue 12.9%

CMYK

A simple CMYK estimate for #FDFE21 is 0.4% cyan, 0.0% magenta, 87.0% yellow and 0.4% black. These are ink amounts; a printer profile is needed to predict the result on paper.

Cyan 0.4%

Magenta 0.0%

Yellow 87.0%

Black 0.4%

Nearby colors

The nearest shorthand match is #FFFF22. Its matching digit pairs let you write it as #FF2 in CSS. For a modern design, keep #FDFE21 when you want an exact match. Use its web-safe neighbor, #FFFF33, when matching a legacy palette of 216 colors.

Nearest shorthand: #FFFF22 Nearest web-safe: #FFFF33

Gradient to complement

#FDFE21 #D9D946 #B4B46B #909090 #6B6BB4 #4746D9 #2221FE

Color vision previews

Compare how #FDFE21 appears in each simulation. When two chart lines or status indicators become hard to tell apart, a label, shape or line pattern gives readers another way to distinguish them. Individual perception varies.

Protanopia

A red–green color vision deficiency. Without a distinct response from long-wavelength cones, some reds and greens can look alike, and reds can appear darker.

#FFF300

Deuteranopia

A red–green color vision deficiency. Without a distinct response from medium-wavelength cones, some greens can be difficult to distinguish from reds or browns.

#FFF83C

Tritanopia

A blue–yellow color vision deficiency. Without a distinct response from short-wavelength cones, blue can resemble green, and yellow can resemble pink.

#FFEDD9

Protanomaly (50%)

An altered long-wavelength cone response can make reds appear dimmer and harder to distinguish from greens. This swatch shows the model’s halfway setting.

#FFF700

Deuteranomaly (50%)

An altered medium-wavelength cone response can reduce the visible difference between reds and greens. This swatch shows the model’s halfway setting.

#FFFA32

Tritanomaly (50%)

An altered short-wavelength cone response can make blue harder to distinguish from green. This swatch shows the model’s halfway setting.

#FFF98C

Grayscale (luminance)

This design check removes hue and preserves relative luminance so you can compare light and dark areas.

#F6F6F6

Partial grayscale (50% blend)

This design check mixes the original color halfway toward its grayscale equivalent in linear light. Use it to see how a design holds up as color fades.

#F9FAB6

Reference: National Eye Institute: Types of Color Vision Deficiency

Technical reference

CAM16 and CIECAM02 below assume D65 white, an average surround, background Y of 20 against white at 100, and adapting luminance of 4.07 cd/m².

Linear sRGB

These channels scale with emitted light. Use them for lighting calculations and physically meaningful blends.

R 0.98225 G 0.99110 B 0.01521

Display P3

P3 displays can reproduce a wider range of reds and greens. These coordinates reproduce this same sRGB swatch on a color-managed P3 display.

R 0.99285 G 0.99595 B 0.35317

Linear Display P3

These P3 channels are proportional to light, before display encoding.

R 0.98382 G 0.99081 B 0.10238

CIE xyY

The x and y coordinates locate chromaticity on a diagram. Y gives relative luminance on a scale where white is 100.

x 0.416 y 0.501 Y 91.877

CMY

Ideal cyan, magenta and yellow are the complements of the encoded red, green and blue channels.

C % 0.784 M % 0.392 Y % 87.059

Binary RGB

Each eight-bit group represents one channel. Together they store the 24-bit hex color.

11111101 11111110 00100001