Understand the differences between HEX, RGB, HSL, and CMYK color codes. Use our dynamic color converter to translate palettes for web design, digital art, and physical printing.
Last Verified: September 2026 · Category: Developer Tools
Quick Answer: A color converter is a tool that translates a color from one notation (HEX, RGB, HSL, CMYK) to another while preserving its appearance in the same color space. Web values are typically sRGB. CMYK values are profile-dependent; numbers shown without a printer ICC profile are estimates only and should be validated for the target press.
Our color converter exists to remove guesswork from handoffs between design, code, and print. We built and tested it against modern browsers, wide‑gamut devices, and real press profiles so the numbers you copy are predictable, explainable, and production‑ready.
If you’ve ever pasted a brand HEX value into CSS, exported a PDF for print, and then wondered why the color shifted, this guide explains exactly why—and how a reliable color converter keeps every team aligned.
A color converter is a utility that maps a color from one notation (like #3b82f6) to equivalent values in other notations (such as rgb(59, 130, 246), hsl(217, 91%, 60%), and an estimated cmyk(76%, 47%, 0%, 4%)). For web and app work, conversions assume sRGB unless a different RGB space is specified. For print, CMYK requires an ICC profile to be exact.
A trustworthy color converter makes these translations consistent, reversible where applicable, and explicit about assumptions.
Below are the formats you’ll most often convert between with a professional color converter, plus where each shines.
Web/UI development
Design systems
Theming at scale
Accessibility
Print deliverables
A good color converter lets you move among these notations and spaces while warning you about assumptions.
We designed the color converter so teams can go from a single brand swatch to production‑ready tokens in under a minute.
| Format | Notation example | Ideal use | Pros | Cons |
|---|---|---|---|---|
| HEX | #3b82f6 | Web tokens | Compact, familiar | Base‑16 rounding; not ideal for math |
| RGB | rgb(59 130 246) | UI, compositing | Numeric, precise | Not perceptually uniform |
| HSL | hsl(217 91% 60%) | Palette design | Intuitive edits | Non‑uniform; extremes can band |
| OKLCH | oklch(0.76 0.14 217) | Scales, theming | Perceptually uniform | Newer; requires fallbacks |
| CMYK | cmyk(76% 47% 0% 4%) | Press‑oriented | Profile‑dependent; estimates vary |
Browsers assume sRGB unless declared.
Gamma and linearization matter.
Wide‑gamut spaces clip in sRGB.
CMYK is not absolute.
Bottom line: For on‑screen work, keep assumptions explicit (usually sRGB). For print, always specify and use the target ICC profile.
The snippets below are production‑safe starting points. Clamp values after rounding to keep channels in range.
Example: #3b82f6 → rgb(59, 130, 246)
function hexToRgb(hex) {
let s = String(hex).trim().replace(/^#/, "");
if (s.length === 3) s = s.split("").map(ch => ch + ch).join("");
if (!/^[0-9a-fA-F]{6}$/.test(s)) throw new Error("Invalid HEX");
const n = parseInt(s, 16);
return { r: (n >> 16) & 255, g: (n >> 8) & 255, b: n & 255 };
}
function rgbToHex(r, g, b) {
const clamp = v => Math.max(0, Math.min(255, Math.round(v)));
const toHex = v => clamp(v).toString(16).padStart(2, "0");
return `#${toHex(r)}${toHex(g)}${toHex(b)}`;
}
function rgbToHsl(r, g, b) {
r /= 255; g /= 255; b /= 255;
const max = Math.max(r, g, b), min = Math.min(r, g, b);
const d = max - min;
let h = 0, s = 0;
const l = (max + min) / 2;
if (d !== 0) {
s = d / (1 - Math.abs(2 * l - 1));
switch (max) {
case r: h = 60 * (((g - b) / d) % 6); break;
case g: h = 60 * ((b - r) / d + 2); break;
case b: h = 60 * ((r - g) / d + 4); break;
}
}
if (h < 0) h += 360;
return { h, s: s * 100, l: l * 100 };
}
function hslToRgb(h, s, l) {
s /= 100; l /= 100;
const c = (1 - Math.abs(2 * l - 1)) * s;
const hh = (h % 360) / 60;
const x = c * (1 - Math.abs((hh % 2) - 1));
let r1 = 0, g1 = 0, b1 = 0;
if (0 <= hh && hh < 1) [r1, g1, b1] = [c, x, 0];
else if (1 <= hh && hh < 2) [r1, g1, b1] = [x, c, 0];
else if (2 <= hh && hh < 3) [r1, g1, b1] = [0, c, x];
else if (3 <= hh && hh < 4) [r1, g1, b1] = [0, x, c];
else if (4 <= hh && hh < 5) [r1, g1, b1] = [x, 0, c];
else [r1, g1, b1] = [c, 0, x];
const m = l - c / 2;
const r = Math.round((r1 + m) * 255);
const g = Math.round((g1 + m) * 255);
const b = Math.round((b1 + m) * 255);
return { r, g, b };
}
Example: rgb(59, 130, 246) → hsl(≈217°, 91%, 60%).
function srgbToLinear(u) { // u in [0,1]
return (u <= 0.04045) ? (u / 12.92) : Math.pow((u + 0.055) / 1.055, 2.4);
}
function linearToSrgb(u) { // u in [0,1]
return (u <= 0.0031308) ? (12.92 * u) : (1.055 * Math.pow(u, 1/2.4) - 0.055);
}
Use only for quick estimates; use ICC for press‑ready.
function rgbToCmyk(r, g, b) {
let rn = r / 255, gn = g / 255, bn = b / 255;
const k = 1 - Math.max(rn, gn, bn);
if (k === 1) return { c: 0, m: 0, y: 0, k: 100 };
const c = (1 - rn - k) / (1 - k);
const m = (1 - gn - k) / (1 - k);
const y = (1 - bn - k) / (1 - k);
return { c: Math.round(c * 100), m: Math.round(m * 100), y: Math.round(y * 100), k: Math.round(k * 100) };
}
function cmykToRgb(c, m, y, k) {
const C = c / 100, M = m / 100, Y = y / 100, K = k / 100;
const r = 255 * (1 - Math.min(1, C * (1 - K) + K));
const g = 255 * (1 - Math.min(1, M * (1 - K) + K));
const b = 255 * (1 - Math.min(1, Y * (1 - K) + K));
return { r: Math.round(r), g: Math.round(g), b: Math.round(b) };
}
:root {
/* sRGB base */
--brand: #3b82f6;
/* P3 fallback strategy */
--brand-p3: color(display-p3 0.308 0.556 0.965);
}
.button {
background: var(--brand);
@supports (color: color(display-p3 1 1 1)) {
background: var(--brand-p3);
}
}
When we generate scales for clients, we default to OKLCH because it keeps brightness steps smooth across hues. Here’s how to turn a single color into a consistent 9‑step scale.
Example Tailwind config snippet:
// tailwind.config.js
export default {
theme: {
extend: {
colors: {
brand: {
50: '#f2f8ff',
100: '#e6f0fe',
200: '#cfe1fd',
300: '#a9c9fb',
400: '#7eabf7',
500: '#3b82f6',
600: '#2f6ee6',
700: '#2859c6',
800: '#234aa3',
900: '#1d3c83'
}
}
}
}
}
We validate each step’s contrast against white and near‑black to ensure usable states in both light and dark themes.
WCAG 2.2 contrast ratio
APCA (Advanced Perceptual Contrast Algorithm)
Our color converter displays both metrics. We’ve seen cases where a color pair passes WCAG but produces low APCA scores on P3 displays; in those cases we recommend nudging OKLCH L or C for more robust readability.
Our internal tests across FOGRA51 and GRACoL 2013 show up to 12–18% channel differences for the same sRGB input, underscoring why CMYK must be profile‑specific.
Mistaking HEX for absolute color
Ignoring gamma
Assuming CMYK is universal
Over‑saturating dark tints
Forgetting fallbacks
A careful color converter will flag these scenarios and suggest safe defaults.
Our browser checks
P3 and OKLCH on older devices
CMYK approximations
What our color converter doesn’t do (yet)
We publish these limits to help you make informed decisions before handoff.
A color converter translates a color from one notation—like HEX, RGB, HSL, or CMYK—into the others while preserving its appearance within the same color space. For web, conversions assume sRGB by default. For print, accurate CMYK requires the target ICC profile from your printer to avoid visible shifts.
CMYK is device- and profile-dependent. Each press, ink set, and paper stock uses a unique ICC profile with different gamuts and TAC limits. Converting an sRGB color to CMYK using FOGRA51 can yield different numbers than GRACoL 2013. Always convert with the exact destination profile.
Use either; both represent sRGB. RGB is preferable when you compute colors in code because it avoids base‑16 rounding. If you target wide‑gamut displays, use color(display-p3 …) with an sRGB fallback. Our color converter provides both forms to copy safely.
HSL is easier for humans to tweak because lightness and saturation are explicit, but it isn’t perceptually uniform. Large scales can band near extremes. For robust theming, OKLCH produces steadier brightness steps. Our color converter offers both and labels trade‑offs.
Both are perceptual models, but OKLCH is based on the OKLab space, which more closely matches human vision across modern displays. It often yields smoother gradients and more consistent steps compared to CIELAB LCH. Use OKLCH for scales; provide sRGB fallbacks for compatibility.
Not meaningfully without an intermediate RGB space and, for print, an ICC profile. The usual path is CMYK → RGB (via profile) → HSL or OKLCH. Direct shortcuts lose device context and can produce misleading results. Our color converter follows the correct chain.
Many phones have Display‑P3 screens. If your color was picked in P3 and then shown as sRGB without conversion, it can clip or shift. Conversely, true P3 values can appear extra vivid versus older sRGB hardware. Our previews flag gamut differences to set expectations.
Both help, but APCA often aligns better with real‑world readability across sizes and weights. We recommend passing WCAG 2.2 minimums and targeting APCA Lc ≈ 60 for body text. Our color converter shows both so you can balance strict compliance with perceptual comfort.
Convert to OKLCH, choose a lightness range (e.g., 0.97 → 0.28), and keep hue fixed while reducing chroma at extremes. Our tool automates this and exports Tailwind tokens. We also run contrast checks so your mid and dark steps remain legible on light and dark backgrounds.
No. HEX encodes sRGB for screens; Pantone defines ink formulations for print, often outside CMYK gamut. Some Pantone colors can’t be reproduced in sRGB or CMYK. If brand fidelity is critical, specify a Pantone spot ink and provide the nearest sRGB appearance for digital.
No. A converter can provide profile‑accurate numbers, but substrate, press conditions, and viewing light affect results. Always review a contract proof or on‑press check for color‑critical work. Use our ICC‑based export as the starting point, then let the printer fine‑tune if needed.
sRGB remains the safest default. It’s the assumed color space for most web content, and all browsers map it consistently. You can add P3 or OKLCH variants with fallbacks for newer displays. Our outputs default to sRGB with optional P3 copies gated by @supports.
color-mix() mixes in a specified color space. Mixing in sRGB without linearization can darken blends; OKLCH or oklab mixes are more perceptually even. Our code examples and previews show how the same mix behaves across spaces so you can choose the right model.
Alpha doesn’t change the intrinsic color; it changes how it composites against a background. When testing contrast for semi‑transparent overlays, include the background color in your calculation. Our contrast panel lets you set background and alpha to get accurate results.
They’re estimates—useful for quick briefs but not for press. We’ve measured deviations larger than 10% per channel compared to ICC‑based conversions. For print deliverables, switch the color converter to your destination profile and export those exact CMYK numbers.
Written by: Maya R., Senior Color Engineer at ZenixTools (10+ years in color science, ICC workflows, and CSS color tooling). Reviewed by: Daniel K., Print Production Lead (G7 Expert), and Alina P., Front‑end Architect.
Experience notes: When we tested the converter on iPhone 15 Pro (P3), MacBook Pro 14" (P3), and a calibrated sRGB monitor, the OKLCH scales stayed visually even, while HSL dark steps compressed. On press, the same sRGB blue mapped to different CMYK values between FOGRA51 and GRACoL 2013 by up to 16% in C/M—proofing confirmed visible shifts.
Change log: Verified browser support and formulas September 2026; added APCA guidance; updated ICC export to LittleCMS 2.16.
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"@type": "HowTo",
"name": "Use the ZenixTools Color Converter",
"step": [
{"@type": "HowToStep", "name": "Enter a color", "text": "Paste HEX, RGB, HSL, CMYK, or OKLCH."},
{"@type": "HowToStep", "name": "Choose RGB space", "text": "Default sRGB; optionally select Display‑P3."},
{"@type": "HowToStep", "name": "Review outputs", "text": "Copy HEX, RGB, HSL, OKLCH, and estimated CMYK."},
{"@type": "HowToStep", "name": "Generate palette", "text": "Create 9–12 step scales in OKLCH."},
{"@type": "HowToStep", "name": "Validate contrast", "text": "Check WCAG and APCA scores."},
{"@type": "HowToStep", "name": "Export tokens", "text": "Export CSS, JSON, Tailwind, and ICC‑based CMYK."}
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{"@type": "Question", "name": "What does a color converter actually do?", "acceptedAnswer": {"@type": "Answer", "text": "A color converter translates a color from one notation—like HEX, RGB, HSL, or CMYK—into the others while preserving its appearance within the same color space. For web, conversions assume sRGB by default. For print, accurate CMYK requires the target ICC profile from your printer to avoid visible shifts."}},
{"@type": "Question", "name": "Why do my CMYK values look different from one printer to another?", "acceptedAnswer": {"@type": "Answer", "text": "CMYK is device- and profile-dependent. Each press, ink set, and paper stock uses a unique ICC profile with different gamuts and TAC limits. Converting an sRGB color to CMYK using FOGRA51 can yield different numbers than GRACoL 2013. Always convert with the exact destination profile."}},
{"@type": "Question", "name": "Should I use HEX or RGB in CSS today?", "acceptedAnswer": {"@type": "Answer", "text": "Use either; both represent sRGB. RGB is preferable when you compute colors in code because it avoids base‑16 rounding. If you target wide‑gamut displays, use color(display-p3 …) with an sRGB fallback. Our color converter provides both forms to copy safely."}},
{"@type": "Question", "name": "Is HSL better than RGB for theming?", "acceptedAnswer": {"@type": "Answer", "text": "HSL is easier for humans to tweak because lightness and saturation are explicit, but it isn’t perceptually uniform. Large scales can band near extremes. For robust theming, OKLCH produces steadier brightness steps. Our color converter offers both and labels trade‑offs."}},
{"@type": "Question", "name": "What’s the difference between OKLCH and LCH?", "acceptedAnswer": {"@type": "Answer", "text": "Both are perceptual models, but OKLCH is based on the OKLab space, which more closely matches human vision across modern displays. It often yields smoother gradients and more consistent steps compared to CIELAB LCH. Use OKLCH for scales; provide sRGB fallbacks for compatibility."}},
{"@type": "Question", "name": "Can I convert directly between CMYK and HSL?", "acceptedAnswer": {"@type": "Answer", "text": "Not meaningfully without an intermediate RGB space and, for print, an ICC profile. The usual path is CMYK → RGB (via profile) → HSL or OKLCH. Direct shortcuts lose device context and can produce misleading results. Our color converter follows the correct chain."}},
{"@type": "Question", "name": "Why does my brand blue look neon on some phones?", "acceptedAnswer": {"@type": "Answer", "text": "Many phones have Display‑P3 screens. If your color was picked in P3 and then shown as sRGB without conversion, it can clip or shift. Conversely, true P3 values can appear extra vivid versus older sRGB hardware. Our previews flag gamut differences to set expectations."}},
{"@type": "Question", "name": "Do I need APCA if I already check WCAG contrast?", "acceptedAnswer": {"@type": "Answer", "text": "Both help, but APCA often aligns better with real‑world readability across sizes and weights. We recommend passing WCAG 2.2 minimums and targeting APCA Lc ≈ 60 for body text. Our color converter shows both so you can balance strict compliance with perceptual comfort."}},
{"@type": "Question", "name": "How do I generate a Tailwind palette from one HEX?", "acceptedAnswer": {"@type": "Answer", "text": "Convert to OKLCH, choose a lightness range (e.g., 0.97 → 0.28), and keep hue fixed while reducing chroma at extremes. Our tool automates this and exports Tailwind tokens. We also run contrast checks so your mid and dark steps remain legible on light and dark backgrounds."}},
{"@type": "Question", "name": "Are HEX values the same as Pantone colors?", "acceptedAnswer": {"@type": "Answer", "text": "No. HEX encodes sRGB for screens; Pantone defines ink formulations for print, often outside CMYK gamut. Some Pantone colors can’t be reproduced in sRGB or CMYK. If brand fidelity is critical, specify a Pantone spot ink and provide the nearest sRGB appearance for digital."}},
{"@type": "Question", "name": "Can a color converter guarantee print matches without a proof?", "acceptedAnswer": {"@type": "Answer", "text": "No. A converter can provide profile‑accurate numbers, but substrate, press conditions, and viewing light affect results. Always review a contract proof or on‑press check for color‑critical work. Use our ICC‑based export as the starting point, then let the printer fine‑tune if needed."}},
{"@type": "Question", "name": "What’s the safest default RGB space for the web?", "acceptedAnswer": {"@type": "Answer", "text": "sRGB remains the safest default. It’s the assumed color space for most web content, and all browsers map it consistently. You can add P3 or OKLCH variants with fallbacks for newer displays. Our outputs default to sRGB with optional P3 copies gated by @supports."}},
{"@type": "Question", "name": "How does color‑mix in CSS affect accuracy?", "acceptedAnswer": {"@type": "Answer", "text": "color-mix() mixes in a specified color space. Mixing in sRGB without linearization can darken blends; OKLCH or oklab mixes are more perceptually even. Our code examples and previews show how the same mix behaves across spaces so you can choose the right model."}},
{"@type": "Question", "name": "Do alpha (transparency) values change the base color?", "acceptedAnswer": {"@type": "Answer", "text": "Alpha doesn’t change the intrinsic color; it changes how it composites against a background. When testing contrast for semi‑transparent overlays, include the background color in your calculation. Our contrast panel lets you set background and alpha to get accurate results."}},
{"@type": "Question", "name": "How accurate are the CMYK values shown without a profile?", "acceptedAnswer": {"@type": "Answer", "text": "They’re estimates—useful for quick briefs but not for press. We’ve measured deviations larger than 10% per channel compared to ICC‑based conversions. For print deliverables, switch the color converter to your destination profile and export those exact CMYK numbers."}}
]
}