Color Picker
Pick a color and convert between HEX, RGB, and HSL formats instantly.
Complementary Color
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About This Tool
This color picker lets you select any color and instantly see its HEX, RGB, and HSL representations. You can edit any format directly and the other values update in real time. The tool also shows the complementary color and a range of lighter to darker shades, making it perfect for designers and developers building color palettes.
Last updated: April 21, 2026· Reviewed by the CalcNeeds Team
About This Calculator
This color picker lets you select any color visually or by entering a value, then instantly converts it between HEX, RGB, and HSL formats. Whether you are choosing a brand palette, tweaking a CSS gradient, or checking how two colors look side by side, the tool gives you every value you need in one place.
Beyond simple conversion, the picker generates complementary colors, shades, and tints so you can build a cohesive color scheme without switching between apps. Designers, developers, and content creators all benefit from having accurate color codes at their fingertips — no more guessing at hex values or eyeballing contrast.
All conversions happen client-side in your browser. Nothing is uploaded or stored, so you can experiment freely with any color without privacy concerns.
HEX vs RGB vs HSL: understanding color models
HEX is a six-character code preceded by a hash sign (e.g., #3A86FF). Each pair of characters represents red, green, and blue intensity on a 0–255 scale written in base-16. HEX is the most common format in CSS and design tools because it is compact and easy to copy.
RGB (Red, Green, Blue) expresses the same information as three decimal numbers from 0 to 255, such as rgb(58, 134, 255). It maps directly to how screens emit light — mixing red, green, and blue sub-pixels at varying intensities. RGB is intuitive when you need to adjust a single channel programmatically.
HSL (Hue, Saturation, Lightness) describes color the way humans think about it. Hue is the position on the color wheel (0–360 degrees), saturation is vividness (0–100%), and lightness is brightness (0–100%). HSL makes it easy to create lighter or darker variants of a color by adjusting lightness alone.
Color theory basics for web design
Complementary colors sit opposite each other on the color wheel — blue and orange, red and green. They create strong visual contrast and are effective for call-to-action buttons against a neutral background.
Analogous colors are neighbors on the wheel (e.g., blue, blue-green, green). They produce harmonious, low-contrast palettes that feel cohesive and calm, making them a popular choice for dashboards and editorial layouts.
Triadic colors are evenly spaced 120 degrees apart (e.g., red, yellow, blue). They offer vibrant variety while maintaining balance. Use one color as the dominant shade and the other two as accents to avoid overwhelming the viewer.
Accessibility and contrast ratios
The Web Content Accessibility Guidelines (WCAG) require a minimum contrast ratio of 4.5:1 for normal text and 3:1 for large text (18px bold or 24px regular). Failing these thresholds means some users — particularly those with low vision or color blindness — will struggle to read your content.
Contrast ratio is calculated from the relative luminance of the foreground and background colors. A ratio of 1:1 means no contrast (identical colors), while 21:1 is the maximum (black on white). Tools that check contrast typically convert colors to their luminance values using the sRGB formula and then apply the WCAG ratio equation.
When designing, pick your background color first, then choose text and interactive element colors that meet or exceed the required ratio. Dark text on a light background is the easiest combination to get right, but light-on-dark themes work too as long as you verify the numbers.
CSS color formats and when to use them
Modern CSS supports several color notations. The classic hex format (#RRGGBB or shorthand #RGB) is still the most widely used. Adding two more characters (#RRGGBBAA) lets you specify alpha transparency — FF is fully opaque, 00 is fully transparent.
The rgb() and rgba() functions accept decimal values and are useful when you calculate channel values dynamically in JavaScript or CSS custom properties. The newer CSS Color Level 4 spec allows space-separated syntax: rgb(58 134 255 / 0.8).
hsl() and hsla() are especially handy for design-system theming. You can define a base hue as a CSS variable and then derive hover states, disabled states, and surface colors by adjusting saturation and lightness alone, keeping the entire palette automatically consistent.
Color psychology in design
Color influences perception and behavior. Blue conveys trust and professionalism, which is why it dominates finance and technology branding. Red signals urgency and energy, making it effective for sale badges and error messages. Green is associated with growth and success and is commonly used for confirmation states and environmental brands.
Cultural context matters. White represents purity in Western cultures but mourning in parts of East Asia. Yellow suggests happiness in many regions yet can imply caution or cowardice in others. Always consider your target audience when choosing a palette.
In practice, start with one or two brand colors, then build a neutral scale (grays) for text and backgrounds. Reserve saturated accent colors for interactive elements and status indicators. This approach keeps the interface clean while still leveraging color psychology where it counts.
Frequently Asked Questions
How do I convert HEX to RGB?
Split the six-character hex code into three pairs (RR, GG, BB) and convert each pair from base-16 to base-10. For example, #3A86FF becomes R=58, G=134, B=255, or rgb(58, 134, 255). This color picker does the conversion automatically when you enter any hex value.
What is the difference between RGB and HSL?
RGB defines color by mixing red, green, and blue light intensities (0-255 each). HSL defines color by hue (0-360 degrees on the color wheel), saturation (0-100% vividness), and lightness (0-100% brightness). HSL is more intuitive for humans because you can adjust brightness or vividness without changing the base color.
What are web-safe colors?
Web-safe colors are a set of 216 colors that displayed consistently on old 256-color monitors. Each channel uses only the values 00, 33, 66, 99, CC, or FF in hex. Modern screens render millions of colors accurately, so the web-safe palette is no longer a practical limitation, but some designers still reference it for maximum compatibility.
How do I find the complementary color of any color?
In HSL, add 180 degrees to the hue value. If the result exceeds 360, subtract 360. For example, the complement of hue 210 (blue) is 30 (orange). Keep saturation and lightness the same for a true complementary pair. This picker shows complementary colors automatically.
What contrast ratio do I need for accessible text?
WCAG 2.1 requires at least 4.5:1 for normal-sized text (below 18px bold or 24px regular) and 3:1 for large text. For the stricter AAA level, the thresholds are 7:1 and 4.5:1 respectively. Use a contrast checker to verify your foreground and background color combination.
Can I use HSL colors in CSS?
Yes. All modern browsers support hsl() and hsla() in CSS. The syntax is hsl(hue, saturation%, lightness%) or the newer space-separated form hsl(hue saturation% lightness% / alpha). HSL is especially useful for CSS custom properties because you can adjust lightness for hover and active states without recalculating hex values.
What is the best color format for CSS variables?
HSL is often the best choice for CSS custom properties because you can store the hue, saturation, and lightness as separate variables and compose them into different shades and tints. For example, --brand-h: 210; --brand-s: 100%; --brand-l: 50%; then use hsl(var(--brand-h), var(--brand-s), var(--brand-l)) to build variants easily.
How do I pick colors that look good together?
Start with a base color and use color theory relationships: complementary (opposite on the color wheel) for high contrast, analogous (neighbors) for harmony, or triadic (three evenly spaced) for vibrant variety. Limit your palette to 2-3 main colors plus neutrals, and ensure sufficient contrast between text and background colors.
What is the hex code for transparent?
There is no single hex code for transparent, but you can add an alpha channel to any hex color using the format #RRGGBBAA. Fully transparent black is #00000000 and fully transparent white is #FFFFFF00. Alternatively, use rgba(0, 0, 0, 0) or the CSS keyword 'transparent'.
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