About WCAG Color Contrast Checker — Free Online Tool
WCAG Color Contrast Checker calculates precise WCAG 2.1 and 2.2 contrast ratios between foreground text and background colors for accessible design.
Computes relative luminance L1 and L2 using the official W3C formula (0.2126R + 0.7152G + 0.0722B with sRGB gamma expansion) and calculates the exact contrast ratio (L1 + 0.05) / (L2 + 0.05), checking compliance thresholds for WCAG AA (4.5:1), AAA (7:1), large text, and UI components.
Color calculations run entirely client-side in your web browser. Brand palettes, unreleased product color schemes, and design tokens remain 100% private.
Auditing design system color tokens, verifying website readability before frontend release, ensuring accessible button labels, and meeting Section 508 and WCAG compliance.
Also known as: wcag contrast checker · contrast ratio calculator · accessible color checker · color accessibility checker
When to use it
Millions of users with visual impairments or color blindness cannot read text with insufficient contrast.
How it works
Converts RGB color channels into perceptual luminance and calculates the contrast quotient against W3C thresholds.
WCAG 2.2 Success Criteria
Level AA requires a minimum ratio of 4.5:1 for normal body text and 3:1 for large text (18pt or 14pt bold). Level AAA requires 7:1 for normal text.
How to Use WCAG Color Contrast Checker in 4 Easy Steps
Follow this simple guide to process your files in seconds directly inside your browser tab.
Enter Input for WCAG Color Contrast Checker
Provide your input data or parameters in the workspace above. Web accessibility diagnostic tool measuring the luminance contrast ratio between foreground and background colors.
Configure Options
Adjust available settings to match your requirements. Millions of users with visual impairments or color blindness cannot read text with insufficient contrast.
Process Instantly
Execute WCAG Color Contrast Checker locally in your browser with immediate real-time feedback.
Review & Copy Result
Copy or download your finalized results directly to your device.
Why Use WCAG Color Contrast Checker on ShortTrick
Engineered for maximum speed, strict privacy, and frictionless digital productivity.
100% Private & Local
Files processed with WCAG Color Contrast Checker never leave your computer or phone. Zero cloud uploads, zero tracking, and zero risk.
Blazing Fast Engine
Powered by compiled WebAssembly code running directly in your browser with sub-second execution for WCAG Color Contrast Checker.
No Paywall or Account Required
WCAG Color Contrast Checker is completely free with no hidden charges, watermarks, email signups, or artificial daily limits.
High-Fidelity Quality
Advanced algorithms preserve crisp vector text, clear colors, and structural layout integrity.
High-Performance Engine
Processes data in WCAG Color Contrast Checker with sub-second execution latency and zero artificial caps.
Cross-Device Compatibility
Runs seamlessly in modern browsers on Windows, macOS, Linux, iOS (iPhone/iPad), and Android.
Frequently Asked Questions About WCAG Color Contrast Checker
Common questions regarding WCAG Color Contrast Checker, data privacy, file format compatibility, and usage limits.
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