Free WCAG Color Contrast Checker
Ensure your text and UI meet WCAG 2.1 contrast requirements, an essential part of EAA/EN 301 549 conformance. Paste brand colors, preview combinations, and get a clear pass/fail for normal text, large text, and UI components.
Trusted by organizations across Europe working toward WCAG and EAA conformance
Need a WCAG 2.2 compliance test for color contrast?
WCAG 2.2 AA check: Validate normal text, large text, and non-text contrast against required ratios.
Audit evidence: Use pass/fail output in QA tickets and remediation workflows before release.
EAA readiness: Reduce avoidable failures tied to EN 301 549 and procurement reviews.
Related resources: accessibility scanner for websites · free accessibility widget · EAA compliance guide
What is a contrast checker and why use it?
Sufficient contrast improves readability for everyone, especially users with low vision, color-vision deficiencies, or on low-quality displays.
Check 1.4.3 Contrast (Minimum), 1.4.6 Contrast (Enhanced), and 1.4.11 Non-text Contrast for UI components and graphics.
The European Accessibility Act references EN 301 549 which in turn references WCAG contrast is a key part of meeting obligations.
Accessible palettes create resilient, legible interfaces that work in light/dark themes and across devices.
WCAG 2.1 contrast thresholds (quick reference)
Minimum ratio: 4.5:1 (text under 24px regular / 19px bold).
Minimum ratio: 3:1 (≥ 24 px regular or ≥ 19 px bold).
Minimum contrast with adjacent colors: 3:1 (focus rings, form inputs, icons, etc.).
Understanding WCAG Color Contrast for Web Accessibility
A color contrast checker is an essential tool for web designers and developers to ensure their digital content meets accessibility standards. WCAG color contrast guidelines help create interfaces that are readable and usable by everyone, including people with visual impairments.
What is WCAG Color Contrast?
WCAG (Web Content Accessibility Guidelines) defines specific contrast ratios between text and background colors to ensure readability. The contrast checker calculates these ratios using relative luminance values, providing a mathematical measure of how distinguishable colors are from each other. Meeting these standards is crucial for WCAG 2.1 conformance and is referenced by regulations like the European Accessibility Act (EAA) through EN 301 549.
How Does a Contrast Checker Work?
Our WCAG color contrast checker analyzes the luminance difference between foreground (text) and background colors. It automatically calculates the contrast ratio and compares it against WCAG success criteria 4.5:1 for normal text (Level AA), 3:1 for large text, and 7:1 for enhanced contrast (Level AAA). This instant feedback helps you make informed design decisions without manual calculations.
Best Practices for Color Contrast
Start by testing your brand colors early in the design process using a contrast checker. Ensure all text elements, buttons, form inputs, and icons meet minimum requirements. Don't rely solely on color to convey information, use text labels, icons, or patterns as well. Regular testing with a WCAG contrast checker helps maintain accessibility standards throughout your project lifecycle.
WCAG 2.2 Contrast Minimum (Official W3C): 4.5:1, 3:1, and Non-Text 3:1
The official WCAG 2.2 minimum contrast requirements used in accessibility audits are straightforward: normal-sized text must have a contrast ratio of at least 4.5:1, large-scale text must have at least 3:1, and non-text user interface components and graphical objects must have at least 3:1 against adjacent colors. These are the contrast thresholds defined by WCAG 2.2 and commonly validated by accessibility testing tools.
| Element type | WCAG minimum | Success criteria |
|---|---|---|
| Normal text | 4.5:1 | 1.4.3 (AA) |
| Large-scale text | 3:1 | 1.4.3 (AA) |
| UI components and graphics | 3:1 | 1.4.11 (AA) |
WCAG 2.2 vs WCAG 2.1 Contrast Rules
WCAG 2.2 keeps the same core contrast ratios as WCAG 2.1, so your required pass/fail numbers do not change. What does change for high-performing teams is execution: product, design, and QA teams that formalize WCAG 2.2 in their workflow usually move faster from scan results to approved fixes, reduce release risk, and protect conversion-critical interfaces.
WCAG Contrast Requirements by Element Type
WCAG contrast requirements vary by element type. Body text, captions, and helper copy are evaluated as text contrast. Buttons, form boundaries, focus indicators, icons, and state graphics are evaluated under non-text contrast. For practical compliance, test both categories in design QA, confirm again in pre-release checks, and re-test after any palette or component update.
WCAG Colour Contrast Checker
Whether your team uses color or colour, the WCAG rules are the same. This WCAG colour contrast checker evaluates foreground and background combinations against official W3C thresholds and returns a clear pass/fail outcome your designers and developers can act on immediately.
ADA Color Contrast Requirements and WCAG Mapping
In U.S. accessibility programs, ADA remediation work is commonly measured against WCAG success criteria. If your organization needs an ADA contrast checker process, use WCAG thresholds as the measurable baseline and maintain evidence in design reviews, QA sign-off, and release documentation.
WCAG Checker vs Contrast Checker
A contrast checker verifies one critical area: readable color ratios for text and interface elements. A full WCAG checker covers a broader compliance surface, including keyboard support, form semantics, labels, headings, and ARIA behavior. The strongest accessibility teams use both: fast contrast checks in day-to-day design and development, plus full-site WCAG testing before release.
Try the Contrast Checker
Enter foreground and background colors (HEX). The tool calculates the contrast ratio and shows pass/fail for WCAG levels. Results update as you type.
FAQ
Does WCAG 2.1 change contrast ratios?
Does the EAA require WCAG contrast?
What counts as 'large text'?
Make contrast checks part of your workflow
Run contrast checks during design reviews and code PRs. Combine with automated scanning to catch issues at scale.