What is the minimum contrast ratio for WCAG AA compliance?

For WCAG AA compliance, normal text requires a minimum contrast ratio of 4.5:1, while large text (18pt or 14pt bold) requires 3:1.

What is the difference between WCAG AA and AAA standards?

WCAG AAA requires higher contrast ratios: 7:1 for normal text and 4.5:1 for large text, compared to AA's 4.5:1 and 3:1 respectively.

How do I fix poor color contrast?

Use our automatic fix feature to adjust either text or background colors while maintaining your design intent, or manually adjust colors using HSL sliders with visual indicators showing optimal zones for AA/AAA compliance.

What are the visual indicators on the adjustment sliders?

The green zones and AA/AAA markers show optimal ranges for achieving WCAG compliance. The direction hints (Lighter/Darker) guide you toward better contrast based on your current color combination.

Can I test custom color combinations?

Yes, you can enter any hex color codes or use the color picker to select custom colors. The URL updates automatically so you can share specific color combinations.

Color Contrast Checker - WCAG AA & AAA Compliance Tool

1.00:1

Contrarium

Fail

Valde pauper

Textus Normalis

AA (4.5:1)

✖

AAA (7:1)

✖

Textus Magnus

AA (3:1)

✖

AAA (4.5:1)

✖

Color Textus

White

#ffffff

Color Background

Olivine

#9ab973

Celeres correctiones

Praevisum Titulus

Celer brunneus vulpes salit super ignavum canem

Exemplum textus parvi (12px)

Textus

#ffffff

Background

#9ab973

WCAG Normae

Level AA

Minimum ratio contrarii 4.5:1 pro textu normali et 3:1 pro textu magno. Requisitum pro plerisque paginis interretialibus.

Level AAA

Aucta ratio contrarii 7:1 pro textu normali et 4.5:1 pro textu magno. Commendatur pro optima accessibilitate.

Insufficient contrastus pro omnibus magnitudinibus textus - non satisfacit WCAG signa.

Colorum Contrarium Reprehensor

Ratio contrarii textus et colorum background computa.

Elige colorem utens Selector de color pro textu et colore background vel colorem in forma RGB hexadecimal (e.g., #259 vel #2596BE) inserere. Potes labellum movere ad colorem eligendum. Web Content Accessibility Guidelines (WCAG) habet specificam regulam ad auxilium determinandum an textus sit legibilis pro usoribus videntibus. Haec criteria utitur particulari algorithmo ad mappandum combinationes colorum in rationes comparabiles. Usura hac formula, WCAG affirmat quod ratio contrarii coloris 4.5:1 cum textu et eius background sufficiens est pro textu regulari (corporis), et textus magnus (18+ pt regularis, vel 14+ pt audax) debet habere saltem rationem contrarii coloris 3:1.

Claves notae

• Calculatio rationis contrasti in tempore reali
• WCAG AA & AAA conformitas verificatio
• HSL labra ad subtilitatem
• Multiplices formae praevisus

Instrumenta provecta

• Automatica coloris correctio
• Exempla textus et background
• Detectio nominis coloris
• Exportatio resultatorum

ImageColorPicker.com

Color Contrast Checker