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AtoolinColor Picker
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Pick any color and convert between HEX, RGB, HSL, HSV, HWB, and CMYK formats

Color Picker

Pick any color and get values in HEX, RGB, HSL, HSV, HWB, and CMYK formats.

#FF0000
HEX#FF0000
RGBrgb(255, 0, 0)
HSLhsl(0, 100%, 50%)
HSVhsv(0, 100%, 100%)
HWBhwb(0 0% 0%)
CMYKcmyk(0%, 100%, 100%, 0%)

Contrast Preview

On White
Sample Text
4.0:1
AA: FailAAA: FailAA Large: Pass
On Black
Sample Text
5.3:1
AA: PassAAA: FailAA Large: Pass

Tints

#FF1A1A
#FF3333
#FF4D4D
#FF6666
#FF8080
#FF9999
#FFB3B3
#FFCCCC
#FFE6E6
#FFFFFF

Shades

#E60000
#CC0000
#B30000
#990000
#800000
#660000
#4D0000
#330000
#190000
#000000

CSS Snippets

color: #FF0000;
background-color: #FF0000;
border-color: #FF0000;
--brand-color: #FF0000;
rgb(255, 0, 0)
hsl(0, 100%, 50%)

How Does a Color Picker Convert Between Color Formats?

Pick any color on the spectrum and the tool captures it as an HSV coordinate — hue as angle, saturation as radius, brightness as value. From there the math is direct: HSV converts to RGB, RGB encodes to HEX (two hexadecimal digits per channel), and separate formulas produce HSL, HWB, and CMYK. These conversions follow the algorithms defined in the CSS Color Level 4 specification. In our testing, Atoolin's color picker recalculates all six formats simultaneously, with no perceptible lag between moving the selector and seeing updated values.

Why Use an Online Color Picker?

The main thing a color picker saves is context-switching. Front-end developers pull HEX or HSL values straight into CSS without opening another app. Brand designers cross-check whether a client's signature color survives conversion from RGB to CMYK — screen and ink don't always match, and reprints are expensive. Teams building for accessibility test contrast ratios against the HSL lightness value. Dark mode design means stepping the L up or down to build a tonal scale. In our testing, the most common task is converting a brand HEX to CMYK for a print vendor, something that used to mean opening Photoshop. The MDN color reference lists every CSS format with browser compatibility data.

What Is the Difference Between HSL and HSV?

HSL places fully saturated colors at 50% lightness. Push toward 100% for white, pull toward 0% for black. HSV puts those same colors at 100% value — drop saturation to reach white, drop value to reach black. In practice, HSL works better for CSS because a fixed lightness step gives a visually even tonal increment. HSV is the default in most picker interfaces because it maps directly to a 2D square: saturation left-to-right, value top-to-bottom, so the selector position is immediately intuitive. In our testing, designers pick a starting color using the HSV gradient, then paste the HSL output into their CSS variables. The MDN HSL reference has the conversion math and browser support table.

Frequently Asked Questions

What is a HEX color code?
A HEX code is six hexadecimal characters after a # sign. The first two encode red, the middle two green, the last two blue — each pair ranges from 00 (none) to FF (full). So #FF0000 is pure red and #FFFFFF is white. HEX is standard in HTML and CSS because it is short, readable, and works in every browser.
How do I convert RGB to HEX?
Take each RGB value (0 to 255), convert it to a two-digit hexadecimal number, and join them with a # prefix. RGB(255, 0, 128) becomes #FF0080 because 255 is FF, 0 is 00, and 128 is 80. Atoolin's color picker does this automatically — adjust the RGB sliders and copy the HEX field with one click.
What color format should I use for CSS?
HEX is compact and works everywhere. Switch to HSL when generating tonal variants in code — stepping the L value gives predictable lightness increments. Use rgba() when transparency is required. The oklch() format adjusts color perceptually, which helps with accessible palettes, but browser support is still partial in 2025.
When should I use CMYK instead of RGB?
CMYK is for print. Printers lay down cyan, magenta, yellow, and black ink, and the colors they reproduce are a narrower set than what a screen shows in RGB. If you are printing business cards, posters, or packaging, convert to CMYK first and get a physical proof before a full run — what looks right on screen may print noticeably different.

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