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WCAG Contrast Checker

Check color contrast ratio and WCAG AA/AAA compliance for text accessibility.

Foreground (Text)

Background

Sample Large Text (18pt Bold)

Sample normal text for reading — this is 16px body copy to test readability.

—:1

WCAG 2.1 Requirements

Level	Normal Text	Large Text	UI Components
AA	≥ 4.5:1	≥ 3:1	≥ 3:1
AAA	≥ 7:1	≥ 4.5:1	—

📌 Large text = 18pt (24px) regular OR 14pt (18.67px) bold

About WCAG Contrast Checker

WCAG Contrast Checker is a free visual design tool that helps front-end developers and designers check color contrast ratio and wcag aa/aaa compliance for text accessibility with a live preview. Instead of writing CSS by hand and refreshing your browser repeatedly, use this interactive tool to experiment with values and copy the generated code directly into your project.

How to Use

Adjust the visual controls Use sliders, color pickers, and dropdowns to customize the design properties. The preview updates in real time.

Fine-tune the result Experiment with different values until the design looks exactly the way you want it.

Copy the CSS code Click the Copy button to copy the generated CSS code. It's production-ready and includes vendor prefixes where needed.

Paste into your project Add the copied CSS to your stylesheet. The code works in all modern browsers without modification.

🔒 Privacy note: All processing happens locally in your browser. Your data is never sent to any server.

Why Use WCAG Contrast Checker?

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Visual Live Preview See your changes in real time as you adjust values. No more guessing what CSS properties will look like — experiment visually and copy the code.

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Production-Ready CSS The generated code is clean, optimized, and ready to paste directly into your stylesheet. Includes vendor prefixes where needed for cross-browser support.

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Faster Than Hand-Coding What takes 10 minutes of CSS trial-and-error takes 10 seconds with WCAG Contrast Checker. Adjust sliders and dropdowns instead of editing numbers in code.

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Learn CSS Visually Perfect for CSS beginners who want to understand how properties affect visual output. Experiment with values and see the relationship between code and design.

Frequently Asked Questions

WCAG (Web Content Accessibility Guidelines) are international standards for making web content accessible to people with disabilities, including those with visual impairments. Level AA is required for most government and corporate websites.

Contrast ratio = (L1 + 0.05) / (L2 + 0.05), where L1 is the relative luminance of the lighter color and L2 is the darker one. Luminance uses linearized RGB values per the WCAG formula.