Contrast Checker WCAG
Check color contrast ratio according to WCAG guidelines.
About Contrast Checker WCAG
Designed for designers, developers and accessibility auditors, the Contrast Checker WCAG opens instantly with no signup and nothing to install. Everything is copy-paste CSS with no framework lock-in, so the code drops into any project from a WordPress site to a Dukaan storefront. Check the WCAG contrast ratio between a foreground and background colour, with the tool showing the exact ratio and a pass or fail against AA and AAA levels for normal and large text. Accessibility matters because low contrast excludes users with low vision and is a legal risk for public sites, and the tool explains the 4.5 to 1 threshold for normal text and 3 to 1 for large text. Indian government and banking sites, which must meet accessibility guidelines, rely on this, and the tool suggests adjustments when a pair fails. Because it runs locally, nothing is uploaded. It is the contrast checker that turns a vague looks fine into a measured pass. Real-world uses include checking a button colour for WCAG, auditing a site for accessibility, and fixing a low-contrast text pair. Small screen or large, the controls stay finger-friendly and the numbers stay readable.
How to Use the Contrast Checker WCAG
- Open the Contrast Checker WCAG tool above — it loads instantly in your browser.
- Enter your values in the input fields provided.
- The result updates immediately — no calculate button needed (or click Calculate where shown).
- Copy or use your result directly. Nothing is stored or sent to any server.
Key Features of Contrast Checker WCAG
- Foreground/background
- AA/AAA pass/fail
- WCAG 2.1
- Exact contrast ratio
- AA and AAA pass or fail
- Normal and large text thresholds
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Frequently Asked Questions
What is WCAG contrast ratio?
WCAG (Web Content Accessibility Guidelines) require minimum contrast ratios: 4.5:1 for normal text (AA), 3:1 for large text (AA), 7:1 for normal text (AAA). Our checker validates all levels.
How is contrast ratio calculated?
Contrast ratio = (L1 + 0.05) / (L2 + 0.05) where L1 is relative luminance of lighter color and L2 of darker color. Values range from 1:1 (no contrast) to 21:1 (maximum).
Why is color contrast important?
Good contrast ensures text is readable by users with visual impairments, color blindness, and low-vision conditions. It's legally required for many websites and improves UX for all users.
What is the WCAG AA threshold?
Normal text needs a contrast ratio of at least 4.5 to 1, and large text needs 3 to 1, which the tool checks.
What is the AAA level?
AAA is stricter, needing 7 to 1 for normal text and 4.5 to 1 for large text, the highest accessibility standard.