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Contrast Checker

Color

Check text and background contrast for WCAG AA and AAA accessibility compliance.

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Contrast Checker
Sample TextThe quick brown fox jumps over the lazy dog.
Contrast Ratio
21.00:1
WCAG Level
AAA
Excellent contrast for all text sizes

Iterating through a handful of candidate text colors against the same fixed background during a design pass usually means checking each one separately, when the actual goal is simpler, finding out which of several options actually clears WCAG's bar rather than confirming just one color in isolation. This tool checks a text and background color pair against WCAG AA and AAA contrast requirements, making it fast to run several candidate colors through the same check while narrowing down a palette.

See more about the Contrast Checker

Useful for testing a handful of candidate text colors against one background to see which ones actually pass, confirming a chosen color meets the stricter AAA standard once AA alone isn't enough, or double-checking a final color choice right before it gets locked into a design system.

Key features

  • Clean interface
  • Fast processing
  • No signup required
  • Works offline

Quick answers for Contrast Checker

How is this different from the Color Contrast Ratio Checker?
They use the same WCAG relative-luminance formula and check a single foreground and background pair, this tool additionally renders a live sample-text preview against your chosen colors so you can see the actual contrast, not just the ratio number.
What do the AA and AAA levels mean?
They are the WCAG contrast thresholds, AAA requires a ratio of at least 7:1 for normal text, AA requires at least 4.5:1, and a separate AA Large tier accepts 3:1 for text 18pt or larger.
What happens if my colors fail every level?
The tool shows a "Fail" result when the ratio falls below 3:1, telling you the pairing is not accessible at any WCAG text size.