WCAG Contrast Checker: Ensuring Accessible Color Combinations
Why Color Contrast Matters
Approximately 300 million people worldwide have color vision deficiency. Poor contrast makes text unreadable for them — and even users with perfect vision struggle with low-contrast text in bright sunlight or on older monitors. WCAG (Web Content Accessibility Guidelines) sets minimum contrast ratios to ensure content is readable by everyone.
WCAG Contrast Levels
WCAG defines two conformance levels: **AA** requires 4.5:1 contrast for normal text and 3:1 for large text (18px+ bold or 24px+ regular). **AAA** requires 7:1 for normal text and 4.5:1 for large text. Most organizations target AA compliance. Check how colors like slate-gray or forest-green perform against different backgrounds.
Common Contrast Mistakes
Light gray text on white backgrounds is the most common accessibility failure. Other pitfalls include colored text on colored backgrounds without checking contrast, using thin font weights that reduce perceived contrast, and placeholder text that's too faint. Always verify contrast during the design phase — not after launch.
Fixing Low Contrast
If your text fails contrast checks, you have several options: darken the text color, lighten the background, increase font size or weight, or choose a different color entirely. Small adjustments (making a gray just 15% darker) often fix contrast without changing the design's visual feel. Use midnight-blue or charcoal instead of medium grays for body text.