Website Accessibility Audit Summary
A website accessibility audit summary analyzes a webpage against WCAG 2.2 Level AA accessibility standards using Google Lighthouse. It identifies automated accessibility violations including low-contrast text, missing image alt text, unlabeled form fields, and invalid ARIA attributes.
Click to choose or drop a Lighthouse JSON report here
Parses categories.accessibility audits locally with zero telemetry.
Key Accessibility Audit Checkpoints
Automated checks covering contrast, ARIA landmarks, form labels, and multimedia tags.
| Accessibility Checkpoint | Status | Standard Guideline |
|---|
WCAG 2.2 AA Core Requirements
Ensure text maintains a 4.5:1 ratio against background shades for readability in varying light conditions.
All interactive links, buttons, and inputs must be operable using only standard keyboard Tab and Enter keys.
Every form element must have an accessible name via <label> or aria-label attributes for screen readers.
What is a Website accessibility audit summary and when should you use it?
The Website Accessibility Audit Summary is an automated web accessibility evaluation tool designed to assess webpage compliance with Web Content Accessibility Guidelines (WCAG) 2.2 Level AA criteria. Digital accessibility ensures that all users—including individuals utilizing screen readers, keyboard navigation, high-contrast display modes, or speech input software—can access and interact with web content without barriers. Search engines like Google increasingly emphasize inclusive design and technical accessibility as fundamental hallmarks of high-quality digital publishing. By auditing live URLs via Google's PageSpeed Insights service or parsing uploaded Lighthouse JSON reports, this tool groups accessibility checks across four core pillars: color contrast ratios, valid ARIA role semantics, descriptive form labels, and accessible multimedia markup. It calculates the overall Lighthouse Accessibility score, surfaces specific failing DOM elements, and offers developer remediation code snippets. To round out your site-wide performance and technical optimization workflow, check top-level category grades with the Google PageSpeed Score Checker, verify real-user Core Web Vitals with the Core Web Vitals Analyzer, compare mobile vs desktop experiences with the Mobile vs Desktop Speed Comparator, inspect hero loading using the Largest Contentful Paint Analyzer, and eliminate layout jumps with the Cumulative Layout Shift Analyzer. Furthermore, eliminate render blockers using the Render Blocking Resources Finder, reduce stylesheet bloat with the Unused CSS Opportunity Finder, optimize image formats using the Image Performance Opportunity Finder, and profile CPU overhead with the JavaScript Performance Audit. Explore more diagnostic utilities in our Website Performance & Core Web Vitals Tools and Technical SEO Audit Tools archives, or inspect server status codes with the HTTP Status Code Checker.
How do you use it?
- Enter a live webpage URL or upload an exported Lighthouse audit report.
- Select Mobile or Desktop emulation to evaluate device-specific accessibility structures.
- Click "Run Accessibility Audit" or click "Load Sample Report" for an immediate demonstration.
- Review the aggregate Lighthouse Accessibility score and overall WCAG compliance status.
- Inspect the itemized breakdown of passing rules versus failing accessibility violations.
- Apply corrective HTML and ARIA markup fixes to resolve color contrast or missing label violations.
Working on a comprehensive technical audit? Browse all free SEO tools to discover the next step in your workflow, or contact our technical support team if you require a specialized custom utility.
Result interpretation & practical applications
When evaluating the output of the Website accessibility audit summary, review the parsed metrics against your specific site architecture. Outputs are formatted for direct implementation into your HTML source, web server configuration, or Google Search Console audit files.
Always inspect generated values for contextual nuance. Automated tools highlight structural patterns, but manual verification confirms that technical directives align with your overarching SEO strategy.
Technical rules and limitations
- WCAG 2.2 AA Standard: Text elements must maintain a minimum contrast ratio of 4.5:1 for normal text and 3:1 for large text.
- Form Accessibility: Every interactive input element must possess an associated programmatic label or aria-label.
- Image Alt Text: Informative images must feature descriptive alt text, while decorative images must use alt="".
- 100% Client-Side Privacy: Uploaded JSON audit reports are parsed entirely in local browser memory with zero server telemetry.
Common mistakes and troubleshooting
- Relying solely on automated audits without conducting manual screen-reader and keyboard tab navigation testing.
- Using generic alt text (such as "image" or "photo") that fails to convey the visual information to screen readers.
- Placing placeholder text inside inputs instead of providing permanent, visible
- Overusing redundant or invalid ARIA roles on native HTML5 elements that already have built-in semantics.
No tool can promise how a search engine will crawl, index, or rank your pages. This tool generates and validates code against documented technical specifications; you determine where to deploy it, and you should always test changes on staging environments first. Google publishes extensive guidelines in Search Central on evaluating third-party SEO tools and advice. Learn more about our technical testing standards on our about us page, or explore full site audits on our pricing page.
Related free tools & workflows
Browse all Website Performance & Core Web Vitals Tools →Technical SEO Audit Workflows
Indexability & Crawling
Redirects & HTTP Headers
Authoritative Technical Documentation & Standards
This tool executes logic aligned with official technical documentation and search engine webmaster standards:
- W3C Web Content Accessibility Guidelines specification
W3C: Web Content Accessibility Guidelines (WCAG) 2.2 Standards
Primary engineering source and technical documentation.
- web.dev accessibility testing guide
web.dev: Automated vs. Manual Accessibility Testing Essentials
Primary engineering source and technical documentation.
Website Accessibility Audit Summary questions
Can automated tools detect 100% of accessibility issues? ↓
No. Automated tools like Lighthouse can detect approximately 30% to 50% of accessibility issues (such as color contrast, missing alt attributes, and invalid ARIA attributes). Comprehensive accessibility testing requires manual keyboard navigation and screen reader audits.
What is the minimum color contrast ratio required by WCAG AA? ↓
WCAG 2.2 Level AA requires a contrast ratio of at least 4.5:1 for normal body text and 3:1 for large text (18pt / 24px or 14pt / 18.5px bold). UI components and graphical objects require a minimum 3:1 contrast ratio against adjacent colors.
Why are form labels required if placeholder text is already visible? ↓
Placeholder text disappears when a user begins typing, creates low-contrast readability issues, and is often ignored or inconsistently announced by screen readers. Permanent programmatic
Is this tool free? ↓
Yes. It is completely free to use and requires no registration or subscription.
Does this tool visit my website or store my files? ↓
No. It executes entirely in your local browser runtime. Your inputs and results are never stored or logged on our servers.
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