What are the differences between WCAG Levels A, AA, and AAA?

WCAG – Web Content Accessibility Guidelines

The WCAG (Web Content Accessibility Guidelines) define three levels of accessibility:

Level A – Minimum Requirements

This level ensures that basic barriers are removed.

Examples:

• images have alternative text

• content is accessible via keyboard

• videos do not autoplay

Level AA – Standard for Legal Requirements

This level includes all Level A requirements plus additional improvements for broader accessibility.

Examples:

• sufficient contrast (at least 4.5:1)

• consistent navigation

• form fields are properly labeled

Note:
Level AA is legally required in many countries – including Germany’s BITV and BFSG.

Level AAA – Highest Level of Accessibility

This level goes far beyond legal minimum requirements.

Examples:

• very high color contrast (at least 7:1)

• sign language videos for content

• text is especially easy to understand

Note:
Level AAA is rarely realistic for entire websites but is recommended for specific content.

Conclusion