WCAG Scanner — Accessibility Checker & Fixes

Scan any page for WCAG accessibility issues — contrast, alt text, ARIA — sorted by Design, Content & Code, with on-device AI fixes.

Scan any page for accessibility issues — and actually understand how to fix them. Built for designers, developers, and content writers: • One-click scan against WCAG 2.2 AA — the level accessibility laws worldwide require — powered by axe-core, the industry-standard engine. • Issues organized by aspect — Design, Content, or Code — so you see the work that's yours: contrast and sizing for designers, wording and alt text for writers, structure and ARIA for developers. • Click any issue to highlight the element on the page. • Contrast fixer: failing color? We compute the nearest passing color instantly. • On-device AI explanations & fixes (Chrome's built-in AI — nothing leaves your machine): plain-language "why this matters", copy-ready fixes, editable alt-text and wording suggestions — including alt text suggested from the actual image. • AI review flags possible failures of two real WCAG criteria that rule engines can't verify — link purpose (2.4.4) and text alternatives (1.1.1) — always as suggestions to confirm by hand, never as errors. No subjective checks, no made-up rules: everything this extension reports traces to a WCAG success criterion. • Copy a Markdown report to hand findings to your team — or paste it into an AI coding agent to implement the fixes. • Works on dynamic sites and SPAs — scan the current view, then interact (open a menu, navigate an app) and Scan again to test newly-revealed content. Honest by design. Automated checks cover only part of any accessibility standard. This extension tells you how many rules were auto-checked, marks AI output as AI-generated, and never claims a page is compliant. What this extension does NOT do (so you know before installing): • It scans one page at a time — no whole-site crawling. Pair it with a CI crawler (axe CLI, Lighthouse CI) for inventories; use this to understand and fix findings. • It is not a screen reader and does not simulate one. Real assistive-technology testing still matters. • Automated rules cover roughly a third of WCAG; the rest needs human judgment. The AI review helps with two specific criteria (link purpose, text alternatives) — as suggestions to confirm, never as verified errors. • No tool can test content that isn't rendered: closed menus and dialogs are counted and reported as untested — open them and Scan again to test them. • AI features need Chrome 138+ on a capable desktop machine (one-time on-device model download). Everything else works everywhere. • The element highlight is drawn once — it doesn't follow if you scroll afterward. • Passing every check here does not make a site accessible, and this tool will never tell you it does. Private by design. 100% on-device. No account, no cloud, no telemetry, no data collection of any kind. The AI runs locally via Chrome's built-in model (Chrome 138+ desktop; a one-time model download is offered — everything else works everywhere). The extension's own interface meets WCAG 2.2 AAA and is verified against our own scanner on every build. FAQ Can it scan my whole website / multiple pages at once? No — by design. This tool scans the page you're on, deeply: find, understand, hand off, fix. For whole-site inventories, use a crawler in your build pipeline (axe CLI, Lighthouse CI, pa11y-ci), then use this extension to understand and fix what those inventories surface. Does it work with single-page applications (React, Vue, Angular...)? Yes. It scans the rendered page — exactly what your users experience — so SPAs work like any other page. It checks what's currently visible, so open the modal/menu/state you care about before scanning; after an in-app route change your results describe the previous view, and the panel detects this and tells you to rescan. Do I need the AI features for it to work? No. Scanning, aspects, highlighting, the contrast fixer, and reports work on every machine. AI explanations light up on Chrome 138+ desktop with the built-in model (one-time download) and degrade gracefully everywhere else. Disclaimer: This tool helps you find and understand accessibility issues; it does not certify compliance. Passing its checks does not mean a page is accessible or conformant with WCAG or any law (ADA, Section 508, EN 301 549). It is not legal advice and is provided "as is", without warranty. axe and Deque are trademarks of Deque Systems, Inc.; this extension uses the open-source axe-core engine and is not affiliated with or endorsed by Deque. Google Chrome is a trademark of Google LLC.