ABC 123 XYZ
Regular text example.
Small text example. The quick brown fox jumps over the lazy dog.
Contrast Ratio
21.00:1
AAA
WCAG 2.1 Accessibility Guidelines
AA Normal Text
Requires 4.5:1
Pass
AA Large Text
Requires 3:1
Pass
AAA Normal Text
Requires 7:1
Pass
AAA Large Text
Requires 4.5:1
Pass
Large text: 18pt (24px) or larger, or 14pt (18.67px) bold or larger
Normal text: All other text
♿ What is Contrast Checker?
Contrast Checker measures the luminance contrast ratio between text and background colors for web accessibility testing. It verifies compliance with WCAG (Web Content Accessibility Guidelines) 2.1 standards in real-time, showing AA and AAA level pass/fail status. Ensuring content is readable for users with visual impairments is both a best practice and often a legal requirement. Testing contrast ratios during the design phase helps prevent accessibility issues before deployment.
📋 WCAG Contrast Ratio Requirements
| Level | Normal Text | Large Text | Application |
|---|---|---|---|
| AA | 4.5:1 minimum | 3:1 minimum | Minimum standard (legal requirement) |
| AAA | 7:1 minimum | 4.5:1 minimum | Enhanced accessibility |
| Note | Large text = 18pt (24px)+ or 14pt (18.67px) Bold+ | ||
💡 Accessible Design Tips
- Body text: Meet AA (4.5:1) minimum, aim for AAA (7:1) when possible
- Placeholders: Keep hint text at 3:1 or higher
- Error messages: Use red color + icons to avoid relying on color alone
- Link text: Add underline or bold to distinguish from surrounding text
- Dark mode: Apply the same contrast standards as light mode
Frequently Asked Questions
What is the difference between AA and AAA levels?▼
AA is the minimum accessibility standard often required by law. AAA requires higher contrast ratios and provides a better experience for users with low vision. Most websites aim for AA, with AAA recommended for critical content.
Why is the requirement lower for large text?▼
Large text has thicker strokes and covers more area, making it easier for users with low vision to perceive. This allows a lower contrast ratio while maintaining the same level of readability.
Does passing contrast checks guarantee accessibility?▼
No, contrast ratio is just one aspect of accessibility. You should also consider keyboard navigation, screen reader compatibility, focus indicators, meaningful alt text, and many other factors.
What is Contrast Checker?
Check if your text and background colors meet WCAG 2.1 accessibility standards. Get AA and AAA pass/fail ratings for normal and large text. Essential for accessible web design.