Free Accessibility Checker - Test Your Website's Accessibility

Alt text provides a text alternative for images, essential for screen reader users and for situations where images fail to load. We check that all content images have meaningful alt attributes, that decorative images use empty alt tags (alt=""), and that alt text is descriptive without being overly verbose. Missing alt text is the most common accessibility failure on the web.

ARIA (Accessible Rich Internet Applications) attributes provide semantic information to assistive technologies for dynamic content and custom widgets. We check for proper ARIA roles, labels, and properties. We also flag misused ARIA that can actually make accessibility worse - the first rule of ARIA is 'don't use ARIA' if a native HTML element will do the job.

Every form input needs a programmatically associated label so screen reader users know what information to enter. We check for missing labels, labels that aren't properly associated via the 'for' attribute, missing input types, and missing autocomplete attributes. Forms without proper labels are one of the biggest barriers for assistive technology users.

Headings create an outline of your page that screen reader users navigate like a table of contents. We verify there's exactly one H1, headings don't skip levels (e.g., H2 followed by H4), and headings are used for structure rather than visual styling. A logical heading hierarchy is critical for screen reader navigation and also benefits your SEO.

Skip navigation links allow keyboard users to bypass repetitive content like headers and navigation menus and jump directly to the main content. We check for the presence of skip links, proper focus management, and that the skip target exists. Without skip navigation, keyboard users must tab through every navigation link on every page visit.

The lang attribute on the HTML element tells screen readers which language to use for pronunciation. We verify the lang attribute is present, uses a valid BCP 47 language tag, and matches the actual content language. Without a language declaration, screen readers may use the wrong pronunciation rules, making content unintelligible.

All interactive elements must be usable with a keyboard alone. We check for proper tab order, visible focus indicators, keyboard-accessible custom widgets, and that no content is trapped in a keyboard focus loop. Approximately 8% of web users rely on keyboard navigation, including people with motor disabilities and power users.

Sufficient color contrast ensures text is readable for users with low vision or color blindness. WCAG 2.1 requires a contrast ratio of at least 4.5:1 for normal text and 3:1 for large text. We check contrast ratios throughout your page and flag elements that fail to meet these thresholds. Approximately 1 in 12 men have some form of color vision deficiency.