Free WCAG Compliance & Contrast Checker
Evaluate text legibility contrast ratios against WCAG 2.1 AA (4.5:1) and AAA standards.
How to Use Instructions:
- Input text foreground hex color code.
- Input background hex color code.
- Click Check Contrast Ratio for pass/fail score on AA/AAA requirements.
Scan Results
Related Free Tools
Continue with related JunctionTools utilities: Color Palette Generator · ARIA & Alt Audit · Mobile UX Checker.
About This Tool
Check the contrast relationship between foreground and background colors for text and interface elements. The result helps designers and developers identify combinations that may be difficult to read.
How to Use It
Enter the foreground and background colors, then review the calculated contrast ratio and the indicated accessibility thresholds.
How It Works
Contrast ratio is derived from the relative luminance of the two colors. WCAG contrast requirements vary by text size and context, so the reported ratio should be interpreted against the applicable success criterion.
Practical Example
A light gray label on a white background may have a low contrast ratio and become difficult to read. Darkening the text or changing the background can improve the ratio.
Frequently Asked Questions
Does passing contrast guarantee accessibility? No. Accessibility also includes typography, focus states, keyboard access, semantics and other factors.
What does the contrast ratio represent? It expresses the difference in relative luminance between two colors.
Should large text use the same threshold as normal text? WCAG criteria distinguish between normal and large text, so use the threshold appropriate to the content.