What is a contrast ratio?

The contrast ratio is a mathematical representation of the difference in light intensity (luminance) between two colors. It ranges from 1:1 (identical colors) to 21:1 (black and white).

Why did my colors fail the WCAG check?

If your colors failed, it means they are too similar in brightness. For example, using a light gray text on a white background does not provide enough visual separation for comfortable reading.

Who benefits from high color contrast?

While it is essential for users with visual impairments (like color blindness or cataracts), high contrast improves readability for everyone, especially those viewing screens outdoors in bright sunlight.

What is the difference between AA and AAA?

AA is the widely accepted industry standard that balances design flexibility with accessibility. AAA is a stricter standard often required for specialized public or government platforms.

Do these rules apply to logos or disabled buttons?

No, WCAG guidelines generally exclude logos, brand names, and disabled UI components (like inactive buttons) from strict contrast requirements.

Color Contrast Analyzer | Quick Tool Kit

WCAG Color Contrast Analyzer

Web accessibility is no longer optional; it is a critical aspect of modern web design and development. Our free WCAG Color Contrast Analyzer helps designers and developers ensure that their website's text is easily readable by everyone, including users with visual impairments such as color blindness or low vision. By simply entering a foreground (text) color and a background color, you instantly receive a contrast ratio score.

The Web Content Accessibility Guidelines (WCAG 2.1) established specific mathematical ratios to determine readability. Failing to meet these standards can result in a poor user experience, lower SEO rankings, and in some regions, legal liabilities. Our tool calculates the exact luminance ratio between your chosen colors and immediately informs you if they pass the AA or AAA standards for both normal and large text sizes.

Understanding WCAG Compliance Levels

Level AA (Minimum Standard): Requires a contrast ratio of at least 4.5:1 for normal text and 3:1 for large text. This is the legal baseline for most government and commercial websites.
Level AAA (Enhanced Standard): The strictest level, requiring a ratio of 7:1 for normal text and 4.5:1 for large text. Achieving this guarantees maximum readability.
What counts as Large Text? According to the W3C, large text is defined as at least 18pt (about 24px) regular weight, or 14pt (about 18.5px) bold weight.

By using our WCAG Color Contrast Analyzer, you agree that all conversions and modifications are processed under your responsibility. We strive for 100% accuracy and efficiency in our algorithms.