Converting colors between HEX, RGB, and HSL formats
Colors are represented differently depending on the context. Web designers use HEX codes (#FF5733) because they're compact and easy to paste into CSS. Developers using RGB (255, 87, 51) think in terms of red, green, and blue light components. Designers thinking about tone and vibrancy prefer HSL (Hue, Saturation, Lightness) because it maps to human color perception—hue is the color itself (0–360 degrees on a wheel), saturation is how vivid it is (0–100%), and lightness is brightness (0–100%). Each format is identical: they describe the same color in different ways. Converting between them is essential when switching tools, sharing colors with teammates, or implementing a design system where colors must work across CSS, Canvas, and image formats.
This tool converts instantly between all three formats. Change any value, and watch the color preview update live. Whether you're debugging a color mismatch, translating from design tools to CSS, or creating accessible color combinations, understanding these formats and how to convert between them is fundamental for modern web development.
Understanding color formats
- HEX (Hexadecimal): A six-digit code starting with # representing RGB values in base-16. #FF5733 means R=FF (255), G=57 (87), B=33 (51). Compact, widely supported, used in CSS and HTML.
- RGB (Red, Green, Blue): Three values 0–255 indicating the intensity of red, green, and blue light. rgb(255, 87, 51) mixes light components. Used in CSS, JavaScript Canvas, and graphics APIs.
- HSL (Hue, Saturation, Lightness): Hue is 0–360 degrees (position on color wheel), Saturation is 0–100% (color intensity), Lightness is 0–100% (brightness). hsl(12, 100%, 61%) is more intuitive for designers.
- Conversion math: All three formats encode the same color information. RGB to HEX is straightforward hex conversion. RGB to HSL uses perception-based math considering max/min values. All conversions are lossless within standard 8-bit color depth.
- Practical choice: Use HEX in CSS files for readability. Use RGB for programmatic color manipulation. Use HSL for creating color harmonies and understanding tone. This tool makes switching between them instant.
Color conversion use cases
- Design handoff. A designer provides colors in a design tool (often RGB or HEX). Convert to the format your CSS or code expects.
- Color harmony creation. Use HSL to generate related colors: add 120° to hue for a complementary color, adjust saturation/lightness for darker/lighter variants.
- Canvas and graphics. JavaScript Canvas requires RGB or HEX. Convert your design tokens to the right format for rendering.
- Accessibility checks. When evaluating contrast ratios or color blindness simulators, you need precise RGB values. Convert and verify.
- Color system maintenance. Build design systems with color tokens. Store in one format and convert for different platforms (web, mobile, print).
Frequently asked questions
What does the color picker do?
The color swatch (circular input) on the left opens your system's color picker. Choose any color visually, and all three formats update instantly. This is the fastest way to experiment and explore colors.
Why might my conversions show tiny rounding differences?
RGB values are integers (0–255). HSL uses percentages and degrees, which can be fractional. Converting between them involves rounding. Differences are usually imperceptible; the color looks identical even if the values differ by 1–2 units.
What about RGBA (with transparency)?
This tool handles opaque colors (alpha = 1). For transparency, add an alpha channel manually: rgba(255, 87, 51, 0.5) or hsla(12, 100%, 61%, 0.5). Most design tools handle alpha separately.
Is the color preview accurate?
Yes, the preview bar shows the exact color. Different screens and calibration may display it slightly differently, but the conversion values are mathematically correct. Use standardized color space profiles if precision is critical.