Free tool
Check WCAG color contrast for text against any background. The ratio uses the WCAG 2.1 luminance formula with AA/AAA pass badges for normal and large text.
Preview
The quick brown fox jumps over the lazy dog
Body sample copy at normal size — review legibility for the smallest text in your interface.
Smaller helper text checks captions and subtle labels.
Contrast ratio
17.85:1
Normal text
≥ 4.5:1 AA · ≥ 7:1 AAA
Large text
≥ 3:1 AA · ≥ 4.5:1 AAA
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Workflow
Three quick steps from input to a result you can use in your stack.
Step 1
Pick or paste foreground (text) and background hex colors.
Step 2
Use the picker or edit hex manually.
Step 3
Read the ratio instantly and WCAG AA/AAA pass state.
Why teams use it
Overview
Contrast Checker is a practical online utility for day-to-day business and content workflows. It is designed to reduce friction in common tasks so you can move from input to result quickly. Instead of installing heavy desktop tools, you can run the process in-browser and export output immediately.
Teams often need fast one-off tools without onboarding overhead. Contrast Checker helps with exactly that: quick execution, straightforward controls, and downloadable output. It works well for freelancers, small teams, and operators who need reliable utility actions inside modern workflow stacks.
For the best results, use clear input data, verify final output before publishing, and keep copies of generated assets in your project folders. If you use the output in client-facing documents, review labels and formatting for consistency with your brand and compliance requirements.
Answers
WCAG expresses contrast as luminance ratios (up to about 21:1). AA needs 4.5:1 for normal text or 3:1 for large; AAA needs 7:1 or 4.5:1 for large.
Roughly ≥24px normal or ≥19px bold equivalents; treat headlines and chunky UI labels as large.
Bright saturated hues rarely meet AA against white/black; darken text, lighten tint, or use brand only for accents.
No it runs purely in-browser using standard WCAG math.
Whenever AA passes consistently across states you ship safer UI test hover disabled too.
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