When should I use HEX vs RGB vs HSL?

HEX is compact and universal in design handoffs. RGB maps directly to sRGB channels and is explicit in `rgb()`. HSL separates hue, saturation, and lightness—intuitive for building palettes and hover states by nudging lightness without touching hue. Pick one source of truth in your design tokens and convert for output targets.

Why do designers prefer HSL for themes?

Adjusting `l` (lightness) or `s` (saturation) while holding `h` (hue) yields consistent tints and shades. That matches mental models better than tweaking three RGB sliders. Modern CSS also offers `oklch()` and `lch()` for perceptual uniformity—HSL remains widely understood tooling.

How do alpha channels work across formats?

`#RRGGBBAA` and `#RGBA` shorthand exist in modern CSS; `rgb()` and `hsl()` accept a fourth parameter for alpha. When converting, preserve alpha explicitly—dropping it changes compositing against non-white backgrounds. SVG and canvas fills use the same CSS color grammar in many stacks.

What CSS color functions should I standardize on?

`rgb()`, `hsl()`, `hwb()`, and emerging `color()` with color spaces cover most UI work. PostCSS and browsers differ in support—verify your baseline. For variables, store canonical values once and derive steps with `color-mix()` where supported.

How does color relate to WCAG contrast?

Contrast ratios compare relative luminance of text and background in sRGB. Tools need correct hex/RGB inputs; perceived lightness in HSL does not equal WCAG luminance. Always validate with a contrast checker after conversion—especially for brand colors near the 4.5:1 or 3:1 thresholds.

Color Converter: HEX, RGB, HSL

Translate between HEX, RGB, HSL, and HSB in one place. Pick the model that matches your job—token ramps in HSL, precise channels in RGB, handoffs in HEX.

Try it now: Open the free Color Converter: HEX, RGB, HSL tool — no sign-up required.

Color models are interfaces to the same light

sRGB—the web’s default assumption—maps three additive primaries to screen phosphors or LEDs. HEX is just RGB in hexadecimal shorthand. HSL and HSB (HSV) reorder the same gamut into cylindrical coordinates: hue as an angle, saturation as chroma distance from gray, lightness or brightness as vertical position. None magically makes “brighter yellow” intuitive without practice, but HSL’s lightness axis aligns better with “make a darker variant of this brand blue” than tweaking G and R independently.

HEX and RGB in engineering handoffs

Developers copy #1a2b3c from design tools because it is paste-safe into CSS, Swift, and Android XML. RGB triples matter when you interpolate programmatically or sample from Canvas getImageData. When auditing SVG Viewer output, fills and strokes often arrive as HEX or rgb()—normalizing to one string format reduces diff noise in reviews.

HSL for systematic UI palettes

Generate hover states by reducing lightness a few points; disabled states by lowering saturation and lightness together. Document base hue per brand tier so alerts, success, and neutral grays stay coherent. Remember HSL is not perceptually uniform: equal steps in l do not look equally “light” across hues—validate visually, especially for yellows and blues.

Accessibility and modern CSS color spaces

WCAG 2.x contrast math is defined on sRGB-relative luminance—your converter should stay in that space unless you explicitly target wider gamut displays with documented profiles. Newer functions like oklch() aim for perceptual steps; adoption is growing but polyfills and fallbacks still matter. After choosing brand colors, run automated contrast checks on real text sizes and weights; Image Resizer is unrelated to contrast but matters when text is baked into bitmaps—prefer live text with CSS color whenever possible.

Working with Hex Converter

When you are debugging binary protocols or non-CSS encodings, the dedicated Hex Converter complements this tool: color work stays semantic here, while byte-level inspection stays there. Keep a single source token in your repo (--color-brand-500) and generate framework-specific outputs in CI rather than scattering five formats by hand.

HSB vs HSL in pickers and wide-gamut displays

Photoshop-style wheels often expose HSB (brightness) where saturated yellows stay vivid as you raise brightness; HSL collapses saturated colors toward white as lightness approaches 100%. Converting between them explains why two tools show different triplets for the “same” swatch when labels are ambiguous—standardize terminology in your design system docs. Separately, Display P3 monitors exceed sRGB; a HEX value still maps to sRGB unless you author color(display-p3 …) or attach profiles. If mocks are authored in P3, convert to sRGB for CSS that must match most laptops, or ship fallbacks—otherwise production looks dull on standard panels. Raster exports with baked colors can drift further; prefer live text and CSS, resizing screenshots only when necessary with Image Resizer.

Frequently Asked Questions

When should I use HEX vs RGB vs HSL?: HEX is compact and universal in design handoffs. RGB maps directly to sRGB channels and is explicit in `rgb()`. HSL separates hue, saturation, and lightness—intuitive for building palettes and hover states by nudging lightness without touching hue. Pick one source of truth in your design tokens and convert for output targets.
Why do designers prefer HSL for themes?: Adjusting `l` (lightness) or `s` (saturation) while holding `h` (hue) yields consistent tints and shades. That matches mental models better than tweaking three RGB sliders. Modern CSS also offers `oklch()` and `lch()` for perceptual uniformity—HSL remains widely understood tooling.
How do alpha channels work across formats?: `#RRGGBBAA` and `#RGBA` shorthand exist in modern CSS; `rgb()` and `hsl()` accept a fourth parameter for alpha. When converting, preserve alpha explicitly—dropping it changes compositing against non-white backgrounds. SVG and canvas fills use the same CSS color grammar in many stacks.
What CSS color functions should I standardize on?: `rgb()`, `hsl()`, `hwb()`, and emerging `color()` with color spaces cover most UI work. PostCSS and browsers differ in support—verify your baseline. For variables, store canonical values once and derive steps with `color-mix()` where supported.
How does color relate to WCAG contrast?: Contrast ratios compare relative luminance of text and background in sRGB. Tools need correct hex/RGB inputs; perceived lightness in HSL does not equal WCAG luminance. Always validate with a contrast checker after conversion—especially for brand colors near the 4.5:1 or 3:1 thresholds.

Ready to try it yourself?

Use Color Converter: HEX, RGB, HSL for Free