CodeMaster AcademyThree ways to describe the same color
A single color on screen can be written at least three common ways, and this tool converts between all of them instantly. HEX (like #3B82F6) packs red, green, and blue values into a six-digit hexadecimal string, two digits per channel, and is the format most CSS and design tools default to. RGB (rgb(59, 130, 246)) writes the same three channels as plain decimal numbers from 0-255, which is easier to reason about mathematically but longer to type. HSL (hsl(217, 91%, 60%)) describes color differently altogether — as hue (a position on the color wheel, 0-360°), saturation (how vivid vs. gray), and lightness (how close to black or white) — which is often more intuitive when you're trying to make a color "a bit darker" or "less saturated" without guessing at RGB math.
Why HSL is easier for design tweaks
If you need a lighter version of a brand color, HSL makes that a one-number change — raise the lightness percentage and everything else stays consistent. Doing the same thing in RGB or HEX means recalculating all three channels by hand, since "lighter" isn't a single axis in those formats. This is why many CSS design systems store base colors in HSL even if the final stylesheet exports HEX, and why this tool keeps all three formats synced — change one, and the equivalent values in the other two update automatically.
Contrast and accessibility
Color choice isn't purely aesthetic — the WCAG accessibility guidelines require a minimum contrast ratio between text and its background (4.5:1 for normal text, 3:1 for large text, at the AA level) so people with low vision or color blindness can still read your content. A color that looks fine to you on your monitor can fail contrast checks in practice, especially with muted pastels or light gray text on white backgrounds — worth checking with a dedicated contrast checker before finalizing a palette, not just eyeballing it.
Using this tool
Pick a color visually with the color spectrum or swatch, or type a value directly into any of the HEX, RGB, or HSL fields — the other two update automatically. Copy whichever format your CSS or design tool needs with one click. Everything runs locally in your browser; no color values are sent anywhere.
Common questions
Why do HEX and RGB sometimes look slightly different in other software?
Color rendering can vary slightly across monitors and color profiles (like sRGB vs. Adobe RGB), even when the underlying HEX/RGB values are identical — this is a display characteristic, not a conversion error.
What's the difference between HSL and HSB/HSV?
They're closely related but not identical — HSL uses "lightness" while HSB/HSV uses "brightness," and the two scales compute slightly differently for the same hue and saturation. This tool works specifically in HSL, the format most common in CSS.
Can I get a color's CMYK value for print design?
This tool focuses on screen-based formats (HEX/RGB/HSL). CMYK conversion depends on the specific printer and ink profile, so it's best handled by your print software directly rather than a generic web converter.
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Page last reviewed: July 2026