Color Contrast Analyzer

Analyze color contrast ratios and check WCAG 2.1 accessibility compliance instantly.

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About This Tool

This online color contrast analyzer helps designers and developers ensure their color combinations meet WCAG 2.1 accessibility standards. Enter foreground and background colors in HEX, RGB, or HSL format to calculate the contrast ratio, see visual previews, and check compliance with AA and AAA requirements for normal and large text. The tool provides immediate feedback with clear pass/fail indicators and detailed ratio calculations.

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How to Use

Enter foreground and background colors using HEX, RGB, or HSL input fields
Colors update in real-time with visual swatches
View calculated contrast ratio and WCAG compliance status
Check compliance for normal text (AA:
5:1, AAA: 7:
and large text (AA: 3:1, AAA:
5:
Use the 'Analyze Contrast' button to generate detailed results
View results with color swatches and compliance badges

Frequently Asked Questions

Find Quick Answers

What is WCAG compliance?

WCAG (Web Content Accessibility Guidelines) are international standards for web accessibility. Level AA requires a 4.5:1 contrast ratio for normal text and 3:1 for large text. Level AAA requires 7:1 for normal text and 4.5:1 for large text.

What color formats are supported?

The tool supports HEX (#RRGGBB), RGB (rgb(255,255,255)), and HSL (hsl(0,100%,50%)) formats. You can use any valid CSS color notation.

How is contrast ratio calculated?

Contrast ratio is calculated using the WCAG formula: (L1 + 0.05) / (L2 + 0.05) where L1 is the relative luminance of the lighter color and L2 is the relative luminance of the darker color.

What is considered 'large text'?

Large text is defined as 18pt (24px) or larger, or 14pt (18.67px) or larger if bold. The tool checks both normal and large text compliance levels.

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