Color Contrast Checker
Instantly test WCAG accessibility compliance for your text and background colors.
Contrast Too Low!
Try one of these accessible alternatives for your foreground color to meet at least AA standards (4.5:1):
Frequently Asked Questions
1. What is WCAG contrast ratio?
WCAG (Web Content Accessibility Guidelines) contrast ratio is a measure of the difference in perceived luminance (brightness) between two colors. It ranges from 1:1 (e.g., white on white) to 21.1 (e.g., black on white). Higher numbers indicate greater contrast, making text easier to read for people with visual impairments.
2. What is the difference between AA and AAA?
AA is the mid-range level of accessibility compliance and the standard most organizations aim for. It requires a contrast ratio of at least 4.5:1 for normal text. AAA is the highest level of compliance, requiring a stricter 7.0:1 contrast ratio. Meeting AAA standards makes content accessible to a broader range of users, including those with significant vision loss.
3. What counts as large text?
According to WCAG guidelines, large text is defined as 18 point (typically 24px) or larger, or 14 point (typically 18.66px) or larger if it is bold. Large text is easier to read and therefore requires a lower contrast ratio (3.0:1 for AA) than normal text.
4. Why does color contrast matter?
Good color contrast is essential for accessibility. It ensures that text and interactive elements are readable and distinguishable for users with low vision, color blindness, or age-related vision changes. It also improves usability for everyone, such as when viewing a screen in bright sunlight.
5. Is this tool free?
Yes, ToolWise's Color Contrast Checker is completely free to use. There are no limits on how many colors you can check, and no signup is required.