Test your website for common WCAG accessibility issues including missing alt text, form labels, heading structure, ARIA misuse, and contrast errors with a free online accessibility checker.
Audit a URL or pasted HTML for missing alt text, unlabeled forms, heading skips, ARIA mistakes, landmarks, and contrast issues — mapped to WCAG 2.1 A & AA.
Static check: automated rules catch common structural issues. Full WCAG legal compliance still needs keyboard and screen-reader testing.
Enter a URL or paste HTML to check 16 WCAG-aligned rules: language, images, forms, headings, ARIA, landmarks, and more.
Missing alt text, empty decorative images, and untitled iframes.
Unlabeled inputs, empty buttons, generic “click here” links, and tabindex traps.
html lang, heading skips, landmarks, main, and duplicate IDs.
Inline color contrast estimates and viewport zoom lock warnings.
Parsing markup and scoring 16 accessibility rules
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Static WCAG 2.1 automated health index
The Web Content Accessibility Guidelines (WCAG) outline four main principles: Perceivable, Operable, Understandable, and Robust (POUR). Conformance Level AA is the global legal standard for commercial websites and government portals under ADA Title III and EU EN 301 549.
WCAG AA mandates a minimum color contrast ratio of 4.5:1 for standard body text and 3:1 for large text (18pt+ or 14pt bold) and essential UI components. High contrast ensures readability for users with low vision, color blindness, or bright screen glare.
All interactive UI controls (buttons, links, form fields, modal dialogs) must be completely accessible using the keyboard alone (Tab, Shift+Tab, Enter, Space). Removing outline CSS without providing a visible custom focus ring breaks keyboard navigation accessibility.
ARIA attributes (aria-label, aria-expanded, aria-hidden, role="dialog") communicate dynamic state changes to assistive screen readers (NVDA, JAWS, VoiceOver). Use native semantic HTML elements (<button>, <nav>, <main>) whenever possible before applying custom ARIA roles.
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