Test text and background color pairs against WCAG 2.1 AA and AAA accessibility standards with real-time contrast ratio score.
Configures fg input during client-side wcag color contrast checker (aa & aaa compliance) computation.
Configures bg input during client-side wcag color contrast checker (aa & aaa compliance) computation.
Configures preset category during client-side wcag color contrast checker (aa & aaa compliance) computation.
Configures custom text during client-side wcag color contrast checker (aa & aaa compliance) computation.
Explore all 10 lightness variants (10% to 95%) of the current text hue against your background. Click any shade to apply.
Level AA is the legally recognized international benchmark for web accessibility (ADA, Section 508, EN 301 549). It requires at least 4.5:1 for normal text and 3.0:1 for large text. Level AAA is enhanced accessibility ( 7.0:1 for body text), critical for public health, government, and high-glare environments.
WCAG defines Large Text as font sizes of at least 18pt (24px) for regular weight, or at least 14pt (18.66px) for bold weights (700+). Because larger glyphs feature thicker stroke weights, they remain readable at a lower contrast ratio of 3.0:1 .
Verify that your fg input matches the expected string format. Load a built-in sample preset to compare structural formatting.
Check the bg input setting in WCAG Color Contrast Checker (AA & AAA Compliance) to ensure encoding, precision, or specification version matches your target runtime.
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