--- title: "Website Accessibility Checker Tool Online: Free WCAG Audit - Web Aloha" description: "Free online website accessibility checker. Scan any webpage for WCAG 2.2 issues, alt text, heading structure, form labels, landmarks, language, keyboard navigation, and more." canonical_url: "https://webaloha.co/tools/accessibility-checker/" markdown_url: "https://webaloha.co/tools/accessibility-checker.md" date_modified: "2026-07-12T00:00:00.000Z" --- # Website Accessibility Checker Tool Online Last updated: Jul 12, 2026 Scan any webpage for WCAG 2.2 accessibility issues, alt text, heading structure, form labels, landmarks, language, zoom restrictions, and more. Get actionable fixes with WCAG criterion references. ## How the Accessibility Checker Works This tool performs an automated WCAG 2.2 audit on any webpage's HTML: 1. **Enter a URL**, the tool fetches the page HTML and analyzes the markup for accessibility issues. 2. **WCAG checks**, it tests 15+ WCAG success criteria across all four principles: Perceivable, Operable, Understandable, and Robust. 3. **Issue categorization**, each issue is tagged with its WCAG criterion number, severity (error/warning/info), and POUR principle. 4. **POUR principle breakdown**, see how many issues fall under each WCAG principle for a structured view of your accessibility posture. 5. **Passes listed**, the tool also shows what your page does right, not just what's wrong. ## Why Web Accessibility Matters Accessibility isn't optional, it's a legal requirement and a competitive advantage: - **Legal compliance**, ADA (US), EAA (EU, from 2025), AODA (Canada), and similar laws require websites to be accessible. Lawsuits for inaccessible websites have increased 300% in recent years. - **Audience reach**, 16% of the world's population lives with a disability. Inaccessible websites exclude potential customers and users. - **SEO benefits**, many accessibility practices directly improve SEO: alt text, heading structure, semantic HTML, page titles, and proper link text are ranking signals. - **User experience**, accessible design benefits everyone: captions help in noisy environments, keyboard navigation helps power users, clear structure helps all readers. - **AI search**, AI engines parse semantic HTML and ARIA landmarks to understand content structure. Accessible sites are more extractable for [GEO](https://webaloha.co/generative-engine-optimization-geo-complete-guide/). Pair this with the [Image SEO Checker](https://webaloha.co/tools/image-seo-checker/), [Heading Checker](https://webaloha.co/tools/heading-checker/), and [Meta Tag Checker](https://webaloha.co/tools/meta-tag-checker/) for a complete audit. For color-specific WCAG compliance, the [Color Contrast Checker](https://webaloha.co/tools/color-contrast-checker/) calculates exact contrast ratios and auto-suggests accessible alternatives. Also check [mobile-friendliness](https://webaloha.co/tools/mobile-friendly-checker/), many accessibility issues (small tap targets, no viewport meta) directly overlap with mobile usability problems. ## The Four WCAG Principles (POUR) WCAG organizes accessibility requirements under four principles: - **Perceivable**, content must be presentable in ways users can perceive. This covers alt text for images, captions for video, sufficient color contrast, and text alternatives. - **Operable**, interface must be operable by everyone. This covers keyboard navigation, skip links, page titles, sufficient time limits, and avoiding seizure-inducing content. - **Understandable**, content and interface must be understandable. This covers language declarations, consistent navigation, form labels, and error handling. - **Robust**, content must work with current and future technologies. This covers valid HTML, proper ARIA usage, and compatible markup. For deeper technical SEO fixes, check your [schema markup](https://webaloha.co/tools/schema-markup-validator/), [security headers](https://webaloha.co/tools/security-headers-checker/), and [overall SEO](https://webaloha.co/seo-services/). Next steps ## Accessibility Checker related tools and articles Continue with the closest follow-up checks and guides based on this tool's topic, crawl intent, and optimization workflow. [![Image SEO Checker Tool Online](https://webaloha.co/_astro/tool-image-seo.AlN-aJci_adcIf.webp?dpl=dpl_AM1rGg4hZQMeX9Xux5JT1y5ZTCmw) Image SEO Checker ](https://webaloha.co/tools/image-seo-checker/)[![SVG Optimizer and Minifier Tool Online](https://webaloha.co/_astro/tool-svg-optimizer.CvAEwBX6_1Y8xH3.webp?dpl=dpl_AM1rGg4hZQMeX9Xux5JT1y5ZTCmw) SVG Optimizer ](https://webaloha.co/tools/svg-optimizer/)[![Mobile-Friendly Checker Tool Online](https://webaloha.co/_astro/tool-mobile-friendly.BkTHf6KG_2x26zX.webp?dpl=dpl_AM1rGg4hZQMeX9Xux5JT1y5ZTCmw) Mobile-Friendly Checker ](https://webaloha.co/tools/mobile-friendly-checker/)[![Image SEO: Alt Text, File Names, Compression, and More](https://webaloha.co/_astro/blog-image-seo-guide.CrIN0DEQ_1SjwFJ.webp?dpl=dpl_AM1rGg4hZQMeX9Xux5JT1y5ZTCmw) Image SEO: Alt Text, File Names, Compression, and More ](https://webaloha.co/image-seo-guide/)[![Heading Tags (H1–H6): Complete SEO Guide for 2026](https://webaloha.co/_astro/blog-heading-tags-seo-guide.L4vmDfh1_jXB5j.webp?dpl=dpl_AM1rGg4hZQMeX9Xux5JT1y5ZTCmw) Heading Tags (H1–H6): Complete SEO Guide for 2026 ](https://webaloha.co/heading-tags-seo-guide/)[![On-Page SEO Checklist for 2026](https://webaloha.co/_astro/blog-on-page-seo-checklist.d3ekW7p7_1fjXX3.webp?dpl=dpl_AM1rGg4hZQMeX9Xux5JT1y5ZTCmw) On-Page SEO Checklist for 2026 ](https://webaloha.co/on-page-seo-checklist-2026/) ## Accessibility Checker: FAQ What does this accessibility checker inspect? It reads the returned HTML and checks detectable signals such as image alt attributes, heading order, form labels, empty links and buttons, duplicate IDs, page language, landmarks, skip links, zoom restrictions, and autoplay media. Findings are grouped under the four WCAG principles. How should I interpret errors, warnings, and information items? Errors indicate a strong machine-detectable problem, such as an unlabeled form field or missing page language. Warnings need context, such as several empty alt values that may be valid for decorative images. Information items are review prompts, not automatic failures. Start with errors, then verify every warning against the page design. Does a passing result prove WCAG 2.2 compliance? No. This is an HTML-level screening tool, not a conformance audit. It cannot judge whether alternative text is meaningful, whether focus order makes sense, whether keyboard interactions work, whether captions are accurate, or whether the experience works with assistive technology. Why can JavaScript-rendered content be missing from the report? The endpoint analyzes the HTML returned by the server. Controls, labels, dialogs, or images added only after client-side JavaScript runs may not appear in that response. Test dynamic states in a browser with a keyboard, screen reader, and a browser-based accessibility scanner. Why can an empty alt attribute be a warning instead of an error? An empty alt value is correct for a decorative image because it tells a screen reader to ignore it. The tool warns only when several empty values deserve review. Keep empty alt text for genuinely decorative images and write useful alternatives for images that communicate content or function. What should I fix first after a failed scan? Prioritize controls without accessible names, unlabeled form fields, missing page language, missing meaningful image alternatives, zoom restrictions, empty links, and duplicate IDs. After changing the markup, retest and manually check keyboard focus, visible focus, contrast, zoom, and screen-reader output. Why might the checker fail to fetch a public page? The page may time out, reject automated requests, require authentication, or block the scanner through a firewall or bot rule. The request follows redirects and waits up to about 12 seconds. A fetch failure says nothing about the page's accessibility. What data is sent when I run the accessibility check? The public URL is sent to the Web Aloha API so the server can fetch and analyze its returned HTML. The form asks for no name, email, login, or private page content, and the endpoint contains no application-storage step for the URL or report. Free 48-Hour Website Audit Not sure what to fix first on your own website? We'll review it and tell you, in plain English. Free & non-obligatory. [Get My Free Audit 💪](https://webaloha.co/free-website-audit/) ## Need Help Making Your Site Accessible? We help businesses achieve WCAG compliance and improve user experience. [Explore Web Design Services 🚀](https://webaloha.co/web-design-services/)