Test and debug color combinations with our interactive contrast checker. Real-time feedback and WCAG compliance testing.
Our free online color contrast checker tool helps you test, analyze and optimize color combinations for web accessibility. Get instant WCAG 2.1 compliance results and real-time feedback to ensure your website colors meet accessibility standards. Perfect for web designers and developers who need to verify text readability, check color contrast ratios, and create accessible color palettes that work for all users, including those with visual impairments.
Color contrast ratio is a measure of the difference in perceived brightness between two colors. It's crucial for ensuring text is readable against its background. The ratio ranges from 1:1 (no contrast) to 21:1 (maximum contrast).
WCAG 2.1 requires a minimum contrast ratio of 4.5:1 for normal text and 3:1 for large text (Level AA). For Level AAA, the requirements are 7:1 for normal text and 4.5:1 for large text.
Large text is defined as 14 point (typically 18.66px) and bold or larger, or 18 point (typically 24px) or larger.
Good color contrast ensures content is readable by all users, including those with visual impairments. It's a fundamental aspect of web accessibility and improves the overall user experience.
To be ADA compliant, your colors must meet WCAG 2.1 Level AA standards at minimum. This means a contrast ratio of at least 4.5:1 for normal text and 3:1 for large text. Use our contrast checker tool to verify compliance.
Yes, poor color contrast can indirectly affect SEO. Search engines consider accessibility in their rankings, and poor contrast can lead to higher bounce rates and reduced user engagement, which can negatively impact SEO performance.
WCAG Level AA is the commonly accepted standard requiring a 4.5:1 contrast ratio for normal text. Level AAA is more stringent, requiring a 7:1 ratio, providing better accessibility for users with severe visual impairments.
To fix contrast issues, adjust either the foreground or background color until you achieve the required ratio. Often, darkening text colors or lightening background colors can help. Use our tool to test different color combinations until you meet WCAG standards.
Text overlaid on images must meet the same contrast requirements. Additionally, important interface elements and graphical objects need a minimum 3:1 contrast ratio against adjacent colors to ensure visibility.