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ValidateHTML

HTML Accessibility Checker

Find accessibility issues in your HTML code. Check for missing alt attributes, heading hierarchy problems, ARIA issues, and WCAG compliance.

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Common HTML Accessibility Issues

Missing Alt Attributes

error

Every <img> element must have an alt attribute describing the image content. Screen readers rely on this text to convey image meaning.

Incorrect Heading Hierarchy

warning

Headings should follow a logical order (h1 → h2 → h3). Skipping levels makes it harder for screen reader users to navigate.

Missing Form Labels

error

Form inputs must have associated <label> elements or aria-label attributes for screen reader users.

Missing Language Attribute

warning

The <html> element should include a lang attribute to help screen readers pronounce content correctly.

Empty Links and Buttons

error

Links and buttons must have discernible text. Icon-only buttons need aria-label attributes.

Missing Document Title

error

Every page needs a <title> element. It is the first thing announced by screen readers.

Why Web Accessibility Matters

Web accessibility ensures that websites are usable by everyone, including people with disabilities. Over 1 billion people worldwide live with some form of disability.

Beyond the ethical imperative, accessibility is increasingly a legal requirement. The European Accessibility Act (EAA), Americans with Disabilities Act (ADA), and WCAG set standards that websites must meet.

Accessible HTML also improves SEO. Search engines use similar signals to screen readers — clear heading hierarchy, descriptive alt text, and semantic markup all help search engines understand your content better.