#efff00

Color #efff00

A vivid, highly saturated medium yellow.

Closest named color Yellow #ffff00 · ΔE 6.79 Nearest Tailwind class lime-300 #bbf451 · ΔE 10.6

Open in Palette generator Color wheel Color mixer Contrast checker Blindness simulator Gradient

Conversions

HEX

#efff00

RGB

rgb(239, 255, 0)

HSL

hsl(63.8, 100%, 50%)

HSV / HSB

hsv(63.8, 100%, 100%)

CMYK

cmyk(6.3%, 0%, 100%, 0%)

LAB

lab(95.94, -28.08, 93.06)

LCH

lch(95.94, 97.2, 106.79)

OKLCH

oklch(95.6%, 0.2153, 114.3)

HWB

hwb(63.8, 0%, 0%)

Harmony colors

Complementary

#1000ff

Analogous

#ff9000

#efff00

#6fff00

Triadic

#efff00

#00efff

#ff00ef

Split-complementary

#efff00

#006fff

#9000ff

Tetradic

#efff00

#00ff10

#1000ff

#ff00ef

Square

#efff00

#00ff90

#1000ff

#ff006f

Shades

Color #efff00 mixed toward black.

#c7d500

#9faa00

#778000

#505500

#282a00

Tints

Color #efff00 mixed toward white.

#f2ff2a

#f4ff55

#f7ff80

#faffaa

#fcffd5

Tones

Color #efff00 mixed toward gray.

#dcea15

#cad52a

#b7bf40

#a5aa55

#92956a

Accessibility

Aa White text on this color

1.11:1

Aa Black text on this color

18.97:1

Black text reads better on this background (18.97:1). That passes WCAG AAA (≥7:1) for normal-size text.

Under color vision deficiencies

Protanopia

#f6f687 · ΔE 9.5

Deuteranopia

#f5f495 · ΔE 11.7

Tritanopia

#f0b0b7 · ΔE 51.2

Achromatopsia

#f3f3f3 · ΔE 30.5

Left half is the original, right half is the simulated appearance. See all 8 vision types →

Code

CSS

background-color: #efff00;

Tailwind (arbitrary value)

bg-[#efff00]

Related colors

Ivory #fffff0

Beige #f5f5dc

Light Goldenrod Yellow #fafad2

Light Yellow #ffffe0

Olive #808000

Yellow #ffff00

Frequently asked questions

#efff00 (#efff00) is rgb(239, 255, 0) in RGB.

No, #efff00 is not web-safe. The nearest web-safe colors are among its tones and shades below.

Related tools

Colors

HEX to RGB Converter

Convert any HEX color code to its RGB and HSL equivalents, live, with copy-to-clipboard values.

Try it → Accessibility

Contrast Checker

Check the WCAG contrast ratio between any two colors, live, with AA/AAA pass-fail results.

Try it → Generators

Palette Generator

Generate complementary, analogous, triadic, split-complementary, tetradic, square, and monochromatic palettes from any base color.

Try it →

Build something with this color

Generate a full palette from #efff00, or check how it holds up for accessibility.

Generate a palette → Check contrast