HEX vs RGB vs HSL: Which Color Format to Use

Every color on a screen can be written as a HEX code, an RGB value or an HSL value. They describe the same colors, just in different shapes. Which one is easiest to work with depends on what you are trying to do.

HEX: short, and what everyone defaults to

A hex code like #5B4FF0 packs red, green and blue into six characters. Each pair is a number written in base 16, from 00 to FF. Here 5B is 91, 4F is 79 and F0 is 240. It's compact, it's what design tools show by default, and it's what most people paste around.

A few useful details: a three-digit code like #fff is shorthand where each digit is doubled, so #fff equals #ffffff. An eight-digit code adds two more characters for transparency, like #5B4FF080. The downside of hex is readability. It's hard to look at a hex code and guess the color, or predict what changing one digit will do.

RGB: closer to how the screen renders it

RGB writes red, green and blue as separate numbers from 0 to 255, like rgb(91, 79, 240). It is more verbose than hex but maps directly to how a screen mixes light. Black is rgb(0, 0, 0), white is rgb(255, 255, 255), and equal values in all three channels give a gray. RGB also has a handy transparent form, rgba(91, 79, 240, 0.5), and modern CSS accepts a space-separated version such as rgb(91 79 240 / 50%). It is the natural choice when code manipulates channels individually, like a canvas-based image filter or a blend calculation.

HSL: the one that's intuitive to adjust

HSL stands for hue, saturation and lightness, and it matches how people think about color. Hue is the base color as an angle on a wheel from 0 to 360 degrees: 0 is red, 120 is green and 240 is blue. Saturation is how vivid versus gray the color is, from 0% to 100%. Lightness is how close it is to black (0%) or white (100%).

The example color above works out to roughly hsl(245, 84%, 63%). Now suppose you want a darker version for a hover state. In HSL you lower lightness to, say, 53% and leave the rest alone. Doing that in hex or RGB means recalculating all three numbers by feel. That makes HSL the easiest format to tweak.

One caveat: HSL lightness is not perceptually even. A yellow and a blue at the same lightness value can look very different in brightness to the human eye. So don't assume two colors with the same L value have the same contrast.

How to decide

• Pasting a color into CSS or handing it to a developer: HEX. It is universal and compact.
• Building a palette or generating shades and tints: HSL. Keep the hue, vary lightness and saturation.
• Working with transparency or channel math in code: RGB, or HSL with an alpha value.
• Preparing for print: the screen formats above are not enough. Print uses CMYK, and conversions from RGB are approximate, so expect some color shift.

None of these is more accurate than another. Converting between them is exact for the same color space, apart from rounding. Rounding is why converting back and forth can shift a value by one step.

Common mistakes

• Mixing up hex digit order. It is red, green, blue, never blue first.
• Forgetting the hash. In CSS, 5B4FF0 without # is invalid.
• Reading hue as a percentage. Hue is in degrees, saturation and lightness are percentages.
• Choosing text colors by eye. Low contrast text is hard to read for many people. WCAG, the web accessibility guideline, asks for a contrast ratio of at least 4.5 to 1 for normal body text at level AA. Check pairs with the color contrast checker, which reports pass or fail against 4.5:1 and 7:1.
• Assuming a color looks identical everywhere. Screens differ in calibration and brightness, so test on more than one display.

A quick worked example

Suppose your brand color is #5B4FF0 and you need a lighter background tint and a darker button hover. In HSL the base is roughly hsl(245, 84%, 63%). For a soft tint, keep the hue and raise lightness to about 95% while lowering saturation a little. For a hover state, drop lightness to around 53%. Because the hue never changes, all three colors feel like one family. Trying to hand-pick three unrelated hex codes usually produces shades that clash. Once you have your values, paste them into a contrast checker to confirm that text on top of them stays readable.

Tools that help

Our color converter shows one color in HEX, RGB, HSL and CMYK side by side, so you can see how it reads in each. For a single direction, there is also HEX to RGB and HEX to HSL. When you need a whole set of related colors, the color palette generator builds a 7-shade palette from one base color.

Frequently asked questions

Is HEX or RGB better for CSS?

Neither is better. Browsers treat them identically. Pick HEX for brevity, or RGB when you need to read the channels or add transparency in a more readable way. Consistency across a project matters more than the choice itself.

Why does HSL feel easier than HEX?

Because its three numbers map to ideas people already have: which color, how strong, how light or dark. Changing one number changes one quality. In HEX, all three color channels are bundled together, so one digit change moves several things at once.

Can two different codes be the same color?

Yes. #FFF, #FFFFFF, rgb(255, 255, 255) and hsl(0, 0%, 100%) are all white. Also, hex codes are case insensitive, so #5b4ff0 and #5B4FF0 are the same color.