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RapideTools

Vérificateur de Contraste

Vérifiez le contraste des couleurs selon WCAG AA/AAA.

Good color contrast keeps text and interface elements readable for everyone, including people with low vision. Pick a foreground and background color to see the WCAG contrast ratio and whether it passes AA and AAA for normal text, large text and UI components — plus simple suggestions when it falls short.

Un bon contraste rend le texte et l'interface lisibles pour tous, y compris les personnes malvoyantes. Visez au moins 4,5:1 pour le texte courant.

Portez ce vieux whisky au juge blond qui fume

Portez ce vieux whisky au juge blond qui fume

Ratio de contraste21.00:1
Texte normal AA · 4.5
Texte normal AAA · 7
Grand texte AA · 3
Grand texte AAA · 4.5
Composants d'interface 3.0

Toutes les conversions de couleur s'exécutent localement dans votre navigateur — rien n'est envoyé, stocké ni journalisé.

Comment ça marche

  1. 1 Choose a foreground (text) color.
  2. 2 Choose a background color.
  3. 3 Read the contrast ratio and AA/AAA pass/fail.
  4. 4 Follow the suggestions until it passes.

Cas d'usage courants

  • Make sure body text meets WCAG AA (4.5:1).
  • Check button and link colors for accessibility.
  • Validate a brand palette before shipping.
  • Avoid low-contrast text that's hard to read.

Questions fréquentes

Is my color data sent anywhere?

No. Every conversion and calculation runs entirely in your browser — nothing is uploaded, stored or logged.

What ratios do AA and AAA require?

AA needs 4.5:1 for normal text and 3:1 for large text (≥18.66px bold or ≥24px). AAA needs 7:1 and 4.5:1. UI components and graphics need at least 3:1.

How is the ratio calculated?

Using the official WCAG formula: (L1 + 0.05) / (L2 + 0.05), where L1/L2 are the relative luminance of the lighter and darker colors.

Is it really free?

Yes — free, with no signup, no watermark and no limits.