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WCAG Contrast Checker

Color accessibility compliance for WCAG 2.1

Contrast Ratio
21:1
Max possible: 21:1 (black on white)
AA Normal
≥ 4.5:1
AA Large
≥ 3:1
AAA Normal
≥ 7:1
AAA Large
≥ 4.5:1

Sample large text

This is normal body text shown in the chosen color combination. WCAG considers text ≥ 18pt (or ≥ 14pt bold) as "large".

Small text — be especially careful with contrast here.

WCAG 2.1 contrast requirements

  • AA (minimum): 4.5:1 for normal text, 3:1 for large text (≥18pt or ≥14pt bold)
  • AAA (enhanced): 7:1 for normal text, 4.5:1 for large text
  • UI components & graphics: 3:1 minimum (WCAG 2.1)
  • Section 508 in the US references WCAG AA as the standard for federal sites

Tips for compliance

  • Avoid pure gray text on white — often fails AA. Use #595959 or darker
  • For body text, aim for AAA (7:1) when possible — friendlier for users with low vision
  • Light text on bright color backgrounds rarely passes — add darker background or text

User Reviews

Average 4.8 stars based on 6 user reviews.

Michelle Zhao2026-05-11
Role: Indie Developer

During design handoff checks, WCAG Contrast Checker solves the part I worry about most: visual options need fast comparison. By keeping WCAG 2.1 AA/AAA visible in the workflow, there is less manual cleanup, and the output is ready for frontend handoff, so it belongs in my regular tool list.

Linda Zhou2026-02-16
Role: Creative Operator

I would recommend WCAG Contrast Checker to anyone who needs wcag contrast checker. It covers long-tail needs like free online wcag contrast checker naturally, and features such as contrast ratio make the result easier to check than an ad hoc workaround.

Emily Lin2026-05-21
Role: UI Designer

The page focus is clear: the core is wcag contrast checker, color contrast accessibility, and brand asset preparation. WCAG Contrast Checker can compare design options quickly; preview and parameters stay together, so the effect is easier to judge, which makes it easy to judge before using it.

Tina Guo2026-02-26
Role: Visual Designer

When I need free online wcag contrast checker, I care about fewer steps. WCAG Contrast Checker keeps compliance check direct; with foreground (text), follow-up review is easier for visitors coming from search.

David Zhang2026-05-05
Role: Frontend Developer

I found WCAG Contrast Checker while looking for wcag contrast checker for color contrast accessibility, and the real issue was that hand-writing CSS while switching previews is slow. Foreground (text) and background are on the same page, so I can preview color, shadow, or layout effects without stitching several tools together.

Kevin Wang2026-02-10
Role: Brand Designer

For wcag contrast checker work, the important part is whether the output is easy to verify. WCAG Contrast Checker puts background up front, it keeps parameter tuning and preview together, and it handles color contrast accessibility work without sending me to another page.