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Web Accessibility Checker (WCAG 2.2 Compliant)

Analyze HTML snippets for WCAG 2.1 and 2.2 violations. Identify missing ARIA labels, contrast issues, and navigation barriers for assistive technology users.

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Category HTML/XML Utilities
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About

Web accessibility ensures digital environments are usable by people with disabilities. This tool parses raw HTML structures to identify violations of the Web Content Accessibility Guidelines (WCAG) 2.1 and 2.2. Compliance prevents legal liability and ensures users relying on assistive technologies, such as screen readers or eye-tracking software, can navigate content effectively. Automated static analysis detects semantic errors like missing alternative text, improper heading hierarchies, and void form labels. While automated tools catch approximately 30-40% of issues, they are critical for establishing a baseline of code hygiene before manual audit.

accessibility wcag aria html-validator screen-readers

Formulas

The Severity Score is calculated based on the weight of violations found relative to the total number of testable elements. High-impact violations (Level A) carry more weight than Level AA or AAA.

{
WA × NA + WAA × NAAScore = 100 − WeightedFaultsTotalElements × 100

Where W represents the penalty weight and N represents the count of violations per level.

Reference Data

Rule IDWCAG LevelSuccess CriterionImpact Description
1.1.1ANon-text ContentImages must have text alternatives (alt attributes) for screen readers.
1.3.1AInfo and RelationshipsSemantic markup (headings, lists) must determine structure, not CSS alone.
2.1.1AKeyboardAll functionality must be operable through a keyboard interface.
2.4.4ALink PurposeLink text alone should describe the destination or function.
3.1.1ALanguage of PageThe default language (lang attribute) must be programmatically determined.
4.1.2AName, Role, ValueUI components must have programmatically determinable names (labels).
1.4.3AAContrast (Minimum)Text vs. background contrast ratio must be at least 4.5:1.

Frequently Asked Questions

Client-side security policies (CORS) prevent browsers from fetching external website code directly. Pasting the raw HTML allows for immediate, secure analysis without sending data to a third-party server.
Level A addresses the most basic web accessibility features. Level AA addresses the biggest and most common barriers for disabled users. Level AAA is the highest (and most difficult) standard. Most legislation requires Level AA compliance.
No. Automated tools can only detect programmatic errors (syntax). Subjective criteria, such as whether an alt-text description is meaningful or if the navigation flow makes sense, require human testing.
Users relying on screen readers hear "Edit text" without context. They will not know what information is required (e.g., email vs. phone number). This fails WCAG criterion 3.3.2 (Labels or Instructions).