📋 In This Page
HEX, RGB, HSL — Which Color Format Should You Use?
Every digital color can be expressed in multiple formats. They all represent the same color — the choice depends on your context and workflow.
| Format | Example | Best For | Supported In |
|---|---|---|---|
| HEX | #3b82f6 | HTML attributes, CSS stylesheets, design tools | All browsers, Figma, Photoshop |
| RGB | rgb(59,130,246) | When mixing colors programmatically or with opacity | All browsers, CSS, JavaScript |
| RGBA | rgba(59,130,246,0.8) | Semi-transparent overlays, shadows, backgrounds | All modern browsers |
| HSL | hsl(217,91%,60%) | Dynamic color generation, dark/light mode, CSS variables | All modern browsers |
| CMYK | C:76 M:47 Y:0 K:4 | Print design, physical media | InDesign, Illustrator |
💡For modern web development, HSL is the most powerful format — you can generate entire color scales by varying lightness (0–100%) while keeping hue and saturation fixed. This is how CSS frameworks like Tailwind build their color systems.
How to Convert Between Color Formats
HEX to RGB
Split the 6-digit HEX into three pairs. Convert each pair from base-16 (hexadecimal) to base-10 (decimal). Example: #1a2b3c → 1A=26, 2B=43, 3C=60 → rgb(26, 43, 60).
RGB to HSL
Normalize R, G, B to 0–1 range. Find max and min values. Lightness = (max+min)/2. Saturation depends on lightness. Hue is calculated from which channel is max. This tool handles the conversion instantly — no manual calculation needed.
💡Use the sliders in this tool to interactively convert colors. The HEX, RGB, and HSL values all update simultaneously as you move any slider — making it easy to understand the relationships between formats.
Color Contrast and Accessibility (WCAG 2.1)
The Web Content Accessibility Guidelines (WCAG) specify minimum contrast ratios between text and background colors to ensure readability for users with visual impairments. Approximately 8% of men and 0.5% of women have some form of color vision deficiency.
| WCAG Level | Normal Text | Large Text (18pt+) | UI Components |
|---|---|---|---|
| AA (minimum) | 4.5:1 | 3:1 | 3:1 |
| AAA (enhanced) | 7:1 | 4.5:1 | — |
| Decorative only | No contrast requirement | ||
Use the contrast checker above to verify your color combinations meet WCAG standards before deploying. This is especially important for buttons, links, form labels, and any text overlaid on colored backgrounds.
Color Harmonies for Designers
- Complementary: Colors opposite on the wheel. Maximum contrast. Use for CTAs that must stand out from backgrounds.
- Analogous: Colors adjacent on the wheel. Low contrast but harmonious. Ideal for backgrounds and ambient color schemes.
- Triadic: Three equally spaced colors. Vibrant and balanced. Used in logos and brand systems with multiple accent colors.
- Split-complementary: One base color plus two colors adjacent to its complement. Softer than complementary but still high contrast.
- Shades: Same hue, decreasing lightness (toward black). Used to create depth and hover states.
- Tints: Same hue, increasing lightness (toward white). Used for backgrounds, disabled states, and light mode variants.
Frequently Asked Questions
A HEX code is a 6-digit hexadecimal number representing a color as #RRGGBB. Each pair (RR, GG, BB) ranges from 00 to FF (0–255 in decimal), controlling red, green and blue intensity. #FF0000 = pure red, #00FF00 = pure green, #0000FF = pure blue, #FFFFFF = white, #000000 = black.
HEX is compact notation for HTML/CSS. RGB defines color by red/green/blue channels (0–255). HSL (Hue, Saturation, Lightness) is more intuitive — hue is the colour angle (0–360°), saturation is intensity (0–100%), lightness is brightness (0–100%). All three represent the same colors — the choice is based on context and what's easier to manipulate in your workflow.
Split the 6-digit HEX into 3 pairs. Convert each from hexadecimal to decimal. For #1a2b3c: 1A=26, 2B=43, 3C=60, giving rgb(26, 43, 60). Use this tool to convert instantly without manual calculation. You can also type the HEX value and all formats update automatically.
Color contrast is the luminance difference between foreground and background, expressed as a ratio (e.g. 4.5:1). WCAG 2.1 requires 4.5:1 minimum for normal text and 3:1 for large text. Poor contrast makes text hard to read — especially for the 300+ million people worldwide with visual impairments. Use the contrast checker in this tool before finalising any text+background color combination.
The eyedropper lets you click anywhere on your screen to sample the exact pixel color. Click the Eyedropper button, then click any color on your screen — a website, an image, a video, or any visible application. The tool uses the browser's EyeDropper API, supported in Chrome 95+, Edge 95+, and Opera. Safari and Firefox don't support this API yet.
CSS custom properties (variables) let you define a color once and reuse it: defined as --primary-color: #3b82f6 in :root and referenced as color: var(--primary-color). This enables consistent color systems, easy dark/light mode switching, and single-point color updates across large stylesheets. This tool generates ready-to-paste CSS variable declarations for any color.
More Free Tools on ToolLoom
📅 June 2026 · Written by the ToolLoom Team · Reviewed for accuracy June 2026
About ToolLoom: We build free tools for Indian students, professionals and creators. Color conversions use standard mathematical formulas. WCAG contrast ratios per W3C specification. Found an error? Email contact@toolloom.in
About ToolLoom: We build free tools for Indian students, professionals and creators. Color conversions use standard mathematical formulas. WCAG contrast ratios per W3C specification. Found an error? Email contact@toolloom.in