WCAG contrast checker — AA & AAA ratios (local)
Pair text and background colors to compute the WCAG 2.x contrast ratio with AA/AAA pass levels for normal, large, and UI text. Live preview and sample pairs — calculated only in your tab.
Frequently asked questions
No. Contrast ratios are computed with pure JavaScript in this tab. Nothing is sent to LocalTools servers for processing.
WCAG 2.x requires at least 4.5:1 for normal text (AA), 3:1 for large text (AA), 7:1 for normal text (AAA), and 3:1 for UI components and graphics against adjacent colors.