Test your foreground and background colors against strict WCAG AA and AAA accessibility standards. Make sure your text is legible for visually impaired users.
This paragraph represents normal text (under 18pt/24px). According to WCAG AA guidelines, it requires a minimum contrast ratio of 4.5:1 to be easily readable by users with visual impairments.
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One of the most common mistakes made by web designers and developers is relying on purely aesthetic choices—like dark grey text on a slightly lighter grey background—without considering accessibility.
According to the World Health Organization, over 2.2 billion people globally have a near or distance vision impairment. If your website has poor contrast, you are actively blocking millions of users from consuming your content. In many countries, failing to meet accessibility standards can even lead to legal action against your business.
A contrast ratio is a mathematical measurement of the difference in perceived luminance (brightness) between two colors. It ranges from 1:1 (white on white, meaning no contrast) to 21:1 (black on white, meaning maximum contrast).
This is the baseline legal and ethical standard for the modern web.
This is the gold standard, often required for government or specialized accessibility applications.
Using our tool above, simply input your Foreground Color (your text color) and your Background Color.
The tool instantly calculates the exact mathematical ratio using the W3C Relative Luminance formula, and tells you whether your combination passes or fails the AA and AAA standards for both large and small text.
If you fail, adjust your colors until the badges turn green!
WCAG 2.1 requires a contrast ratio of at least 4.5:1 for normal text and 3:1 for large text to pass AA standards. AAA standards require a 7:1 ratio for normal text and 4.5:1 for large text.
Larger font sizes (typically 18pt/24px or bold 14pt/18.6px) are easier to read and therefore require lower contrast ratios to pass accessibility compliance audits.
Yes, it evaluates contrast by blending alpha channel layers on top of solid background values using standard RGBA compositing.
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Create Free AccountGenerate complex CSS box shadows visually. Supports multiple layers, inset shadows, opacity, spread, and real-time live preview.
Generate tiny, base64-encoded SVG data URIs for image placeholders in web design.
Visually design complex layouts and generate the corresponding Tailwind CSS utility classes.