Ensure your website is accessible with our free WCAG Color Contrast Checker. Test background and foreground colors instantly for AA and AAA compliance.
SMALL sample text: 14pt (18.5px)
LARGE sample text: 18pt (24px)
| Element Type | AA | AAA |
|---|---|---|
| Small Text | Pass | Pass |
| Large Text | Pass | Pass |
| UI Components | Pass | Pass |
Follow these simple structural instructions to crop and slice your high-resolution photographs into perfectly aligned, puzzle-grid compositions.
Select a foreground/text color using our HEX text box or standard color picker next to it. Real-time relative luminance calculations apply instantly.
Select the background color layout. The checker automatically computes compliance ratios and presents interactive Pass/Fail indicators.
Toggle between Normal Vision and Deuteranopia/Protanopia simulator filters to guarantee inclusive visual accessibility.
Design completely readable digital products without accessibility penalties. Evaluate, preview, and build standard-compliant interfaces instantly.
Real-time evaluation of sRGB relative luminance ensures colors pass standard AA or AAA readability requirements instantly.
Test color contrast degradation dynamically under Protanopia, Deuteranopia, Tritanopia, and complete grayscale impairments.
Load highly legible contrast presets with one-click, or dynamically swap background and text parameters for ideal balance.
Validate, inspect, and optimize sRGB relative luminance.
Answers to common queries regarding WCAG criteria, sRGB relative luminance, and accessibility.
Normal text is defined as body copy under 18pt (approximately 24px) or 14pt bold (approximately 18.67px bold). Large text refers to font sizes at or above 18pt (24px) or 14pt bold (18.67px bold).
The tool incorporates exact standard SVG matrices defined by color deficiency math. Filters dynamically shift red, green, and blue sRGB vectors inside the preview container, simulating Deutera, Prota, or Tritanopia visual shifts physically.
No. The WCAG Color Contrast Checker operates 100% locally in your browser memory using HTML5 Canvas and native JavaScript calculation functions, ensuring zero latency.
Modern search engines evaluate accessibility as a key ranking factor. Lower contrast text triggers user experience penalties inside Google Lighthouse checks, affecting search performance.