WCAG Accessibility Compliance Checker
Audit website HTML structure for WCAG 2.1/2.2 AA accessibility violations. Checks image alt attributes, form labels, heading hierarchies, document lang settings, and ARIA tags.
Static audit runs 7 core WCAG rules. Resizing, contrast, and interactive sizes require runtime execution.
Accessibility Summary
Need Complete Auditing?
We deploy on-demand and build on-demand custom compliance tools based on your enterprise infrastructure guidelines.
- • Headless Chrome DOM rendering
- • Color contrast calculations
- • Touch target element sizing
- • Interactive keyboard focus maps
CI/CD Pipeline Gates
Verify element accessibility programmatically during code compilation stages. Prevent broken layouts from reaching client preview channels.
View API Documentation →What is the WCAG Accessibility Checker?
The WCAG Accessibility Compliance Checker is a free online tool designed to audit website HTML against Web Content Accessibility Guidelines (WCAG 2.1/2.2 AA). Built for web developers, content creators, and compliance officers, it identifies layout errors that block screen readers.
By streaming validation alerts link by link, the tool allows you to identify code errors immediately, saving hours of manual review.
Why Accessibility Compliance Matters
Under modern web standards and ADA laws, accessibility is a legal requirement: 1. Legal litigation risk: Predatory lawsuits target websites with basic structural errors. Fixing image alts and input labels removes 90% of easy litigation targets. 2. Indexing benefit: Assistive tags (like headings and alt text) help search engine crawl engines index page structures and keyword contexts more effectively. 3. Screen reader support: Visually impaired users rely on landmarks, titles, and label associations to browse and understand site layouts.
Running static accessibility audits ensures your site remains clear and accessible for all audiences.
Key Auditing Capabilities
- ✓Real-time DOM streaming: Audits HTML elements dynamically and pushes findings to the dashboard.
- ✓Form label verification: Verifies if input fields are correctly matched with descriptions.
- ✓Alt attribute checks: Flags images missing alternative text or containing generic labels.
- ✓Logical heading order: Assesses heading elements to ensure levels are not skipped.
- ✓Invalid ARIA detection: Audits aria attributes against official W3C specifications.
- ✓Language tag validator: Confirms that pages declare a valid ISO lang attribute.
How the Static Accessibility Check Works
When you submit a URL, our engine retrieves the static HTML source code. The parser scans the elements tree to inspect semantic tags and attribute bindings.
The engine reviews form controls for label associations, checks page headings for sequence breaks, and validates image alternative text. Results are streamed back immediately, categorizing violations by severity.
Accessibility Report Categories
Understanding how accessibility violations are flagged and prioritized.
Structural DOM errors that completely block screen readers or keyboard navigations. These must be addressed to prevent legal compliance actions.
Semantic order skips or missing attributes that reduce assistive readability without entirely blocking the target user experience flow.
Frequently Asked Questions
Common questions regarding automated accessibility verification under ADA guidelines.
Enterprise Accessibility: Dynamic Scans & VPAT Reports
TaskVerified Enterprise helps scale compliance audits with headless browser execution and automated developer patch pipelines.
- ✓Sitemap domain audits: Crawls entire websites automatically to scan all pages for accessibility.
- ✓Color contrast calculator: Evaluates CSS styles to calculate text-to-background contrast ratios.
- ✓Automated code patches: Generates unified git diffs to fix missing tags and labels in your source code.
- ✓VPAT report compiler: Exposes automated templates to generate compliance documentation for corporate procurement bids.
- ✓CI/CD pipeline blocks: Integrates into GitHub Actions to prevent code with accessibility errors from being merged.
Other Diagnostic Tools
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- GS1 & QRBarcode & QR Code ValidatorValidate barcode and QR code payloads for symbology compliance, Modulo-10 checksum accuracy, GS1 Application Identifier structures, and URL reachability.
- BIMI LogoBIMI SVG & SVG Tiny-PS ValidatorAudit SVG brand logos for BIMI inbox compliance. Verifies SVG Tiny-PS structure, security, dimensions, and provides 1-click auto-fixing.
- ReachabilityBroken Link CheckerCrawl absolute outbound HTTP/HTTPS links concurrently. Identify 404, 500, or DNS resolve faults live in the browser.