Color Contrast Checker

THE PRACTICAL GUIDE · NORMANDIN SYSTEMS

Get more from Color Contrast Checker

Color Contrast Checker compares a foreground and background color and reports their contrast relationship for interface design. The useful question is whether text or an interface element is distinguishable against the color immediately behind it. Check actual color pairs rather than isolated brand colors, and consider different states such as normal, hover, disabled, and selected. Web development utilities are useful for checking a focused part of a page before integrating it into a larger design. The browser, document structure, styles, and surrounding application still affect the final behavior. Start with a clear example and a specific destination, such as a stylesheet, page head, link, or test fixture. After preparing the result, check it in context and at more than one viewport size where relevant. A small isolated preview cannot demonstrate every interaction with an existing website.

Guide updated October 13, 2026

How to use this tool

1. Enter a short example that represents the intended page or design. Keep the original values available so you can compare the result.
2. Enter the foreground and background colors, inspect the ratio and reported levels, then adjust one color and compare again.
3. Review the example below and compare its expected behavior with a small sample of your own input before continuing.
4. Use the result in a small test page or relevant browser workflow, then check its appearance and behavior before adding it to a live website.

SEE IT IN PRACTICE

A worked example

Foreground #000000; background #ffffff

Contrast ratio 21:1

Black and white sit at the extremes of relative luminance and provide the maximum contrast ratio for the standard calculation.

Contrast depends on the actual rendered pair

Use the color of the text or interface element and the color immediately behind it. If either is translucent, the effective rendered color is the result of blending with layers underneath. A gradient or photograph can contain many background values, so one sampled ratio cannot describe the whole area. Test the least favorable relevant region and inspect different component states. A readable default button can still have an unreadable hover state if its colors change independently.

A ratio is one accessibility measurement

Contrast calculations are useful evidence, but an interface also needs readable text size, clear focus, meaningful labels, and information that does not depend on color alone. The checker should support a broader review rather than be treated as a complete accessibility certification. When choosing between two brand colors, compare the actual foreground-background arrangement: reversing the pair preserves the ratio but changes visual emphasis. Keep a record of approved text and surface combinations so the same decisions can be reused consistently.

When this tool is useful

• Review body text against page backgrounds
• Choose readable button label colors
• Compare accessible alternatives within a brand palette

Tips for a better result

• Use the real rendered colors, including any blended transparency, and test relevant text sizes and interface states separately.
• Inspect the result in its actual context. Inherited styles, relative paths, document structure, and browser support can change how a correct-looking snippet behaves after integration.
• Keep the source and the settings used for this result together. That makes a later comparison or correction easier, especially when another person needs to reproduce the same outcome.

Frequently asked questions