Contrast validation methods

Back to the contrast grid

Web Content Accessibility Guidelines (WCAG)

The WCAG 2.2 contrast minimum (AA) requirements are the following :

  • The visual presentation of text and images of text has a contrast ratio of at least 4.5:1
  • Large-scale text and images of large-scale text have a contrast ratio of at least 3:1

And the WCAG 2.2 contrast enhanced (AAA) recommendations are the following :

  • The visual presentation of text and images of text has a contrast ratio of at least 7:1
  • Large-scale text and images of large-scale text have a contrast ratio of at least 4.5:1

Référentiel général d’amélioration de l’accessibilité (RGAA)

The RGAA 4.1 text color contrast requirements are the following :

  • The contrast between the text color and its background color is at least 4.5:1
  • The contrast ratio between text of size 24px or larger and its background is at least 3:1

Référentiel d'accessibilité des applications mobiles (RAAM)

The RAAM 2.0 text color contrast requirements are the following :

The contrast ratio between the text and its background is at least 4.5:1 for normal-sized text and at least 3:1 for large text.