📖 Introduction: Professional online color tool providing comprehensive color processing and palette generation features. Perfect integration of color converter, palette generator, color contrast checker, color analysis tool, and more.
Supports real-time bidirectional conversion between HEX, RGB, and HSL color formats. Enter any format to automatically sync updates across others, ensuring color consistency.
Automatically generates Monochromatic, Complementary, Analogous, and Triadic palettes based on color theory, helping create harmonious color combinations.
Checks if color contrast meets WCAG 2.1 accessibility standards, ensuring website colors are suitable for all users, including visually impaired users.
Provides detailed color property analysis including relative luminance, perceived lightness, hue, saturation, and lightness to help understand color characteristics.
Supports one-click copying of color values (HEX, RGB, HSL). Palette colors can also be copied individually for easy use in design tools.
Perfectly adapts to different device screens including desktop, tablet, and mobile. Analyze colors anytime, anywhere without installing any software.
Color standards and calculation methods used by this tool:
Technical Note: This tool uses JavaScript color algorithms for real-time conversion. Contrast calculation is based on WCAG 2.1 relative luminance formula: L = 0.2126×R + 0.7152×G + 0.0722×B. Palette generation is based on color wheel mathematical calculations: Complementary (180° hue difference), Analogous (30° hue difference), Triadic (120° hue difference).
WCAG (Web Content Accessibility Guidelines) are web content accessibility guidelines. Color contrast standards ensure sufficient contrast between text and background so visually impaired users can read clearly. According to WCAG 2.1, normal text requires at least 4.5:1 contrast, large text (at least 18pt or 14pt bold) requires at least 3:1. Not meeting these standards may make websites unusable for some users and could violate accessibility laws in some regions.
Each format has its characteristics:
1) HEX (Hexadecimal): e.g. #4A90E2, most commonly used in web development, concise but less intuitive for understanding color properties
2) RGB (Red Green Blue): e.g. rgb(74, 144, 226), based on light's primary colors, intuitive but less convenient for adjusting color characteristics
3) HSL (Hue Saturation Lightness): e.g. hsl(212, 72%, 59%), based on human color perception, easy to adjust color characteristics (like brightening, darkening, adjusting saturation)
ColorLab supports real-time conversion between these three formats. You can use whichever format is most convenient for your needs.
ColorLab generates four types of palettes based on color theory:
1) Monochromatic palette: Keeps hue constant, adjusts saturation and lightness to create lighter/darker variations
2) Complementary palette: Uses colors opposite on the color wheel (180° hue difference), creates high-contrast combinations
3) Analogous palette: Uses adjacent colors on the color wheel (30° hue difference), creates harmonious, subtle combinations
4) Triadic palette: Uses three equally spaced colors on the color wheel (120° hue difference), creates vibrant, colorful combinations
These palettes are mathematically calculated to ensure harmonious color combinations.
Relative luminance is a brightness value based on human visual perception, ranging from 0 (pure black) to 1 (pure white). The calculation formula considers human eye sensitivity to different colors (most sensitive to green, least to blue). Perceived lightness is an intuitive description based on relative luminance classification, such as "very dark," "dark," "medium," "light," "very light." Relative luminance is used to calculate color contrast, while perceived lightness helps understand color visual weight and suitable applications.
Recommendations for choosing accessible colors:
1) Use ColorLab to check contrast, ensure text and background contrast ≥4.5:1
2) Avoid relying solely on color to convey information (e.g., red for errors), also use text or icons
3) Test from colorblind user perspectives, ensure color differentiation doesn't depend solely on hue differences
4) Provide sufficient color contrast to ensure clear identification even in bright environments
5) Consider color performance in dark mode, ensure good contrast across different themes
Yes, ColorLab color tool is completely free online tool. No registration or login required. We're committed to providing high-quality color tools for designers and developers, helping you create beautiful and accessible color schemes. All processing happens locally in your browser - your color data is not uploaded to any servers.