Free AI Accessibility Scanner
Automatically scan your HTML for accessibility issues with Toolnex AI's powerful A11y checker. No signup required, 100% free and instant results in your browser.
Toolnex AI Accessibility Scanner
Use Toolnex AI's free Accessibility Scanner to automatically check your HTML for accessibility issues like missing ARIA labels, color contrast problems, missing alt text, unlabeled form fields, and broken heading structure — instantly and for free.
HTML Input
Scan Results
No Accessibility Issues Found!
Your HTML appears to be accessible. Great job!
- 🔒 100% Browser-Side Processing
- ⚡ Instant Real-Time Results
- 📱 Works on Mobile & Desktop
- 💯 No Data Sent to Servers
- 🆓 Completely Free to Use
- 🔐 No Signup Required
How to Use Toolnex AI Accessibility Scanner
Paste Your HTML
Copy and paste your HTML code into the input area above. You can paste a full page, a component, or any HTML snippet you want to check.
Select Scan Options
Choose which accessibility checks to run — ARIA labels, color contrast, alt text, form labels, and heading structure. All are enabled by default.
Run the Scan
Click "Scan HTML" to analyze your code instantly. The scanner identifies issues and groups them by severity: Errors, Warnings, and Info.
Review Results
Each issue shows a clear description, what WCAG rule it violates, and a suggested code fix so you can resolve problems immediately.
Fix & Re-Scan
Apply the recommended fixes to your HTML, paste the updated code back in, and re-scan to verify all accessibility issues have been resolved.
What is a Web Accessibility Scanner?
A Web Accessibility Scanner (also known as an A11y checker) is a free online utility that automatically analyzes your HTML code for barriers that may prevent people with disabilities from using your website effectively. It checks your markup against established accessibility standards — primarily the Web Content Accessibility Guidelines (WCAG) — and reports issues with clear explanations and suggested fixes.
Web accessibility is not just a legal requirement in many countries; it's also the right thing to do for your users. Approximately 15% of the global population lives with some form of disability. Inaccessible websites exclude millions of people who rely on screen readers, keyboard navigation, high-contrast modes, and other assistive technologies. Common barriers include buttons without descriptive labels, images with no alt text, forms without properly associated labels, insufficient color contrast between text and background, and disordered heading structures that make page navigation impossible for screen reader users.
Toolnex AI's Accessibility Scanner checks for all of these issues and more. It examines your HTML for missing or empty ARIA attributes on interactive elements, detects inline color contrast issues using WCAG's minimum contrast ratios, flags images lacking alt text or using empty/unhelpful alt values, identifies form inputs without associated labels, and validates that your heading hierarchy (H1 → H2 → H3) follows a logical structure without skipping levels.
The tool works entirely inside your browser — no upload, no server, no account required. Every scan result includes a severity level (Error, Warning, or Info), a description of the specific WCAG guideline being violated, and a concrete code example showing how to fix the issue. Whether you're a developer building a new site, a content creator updating a blog, or a business owner checking an existing webpage, this scanner provides actionable insights to make your web presence inclusive and compliant.
Why Use Toolnex AI Accessibility Scanner?
Completely Free
No subscriptions, no credits, no hidden paywalls. Run unlimited scans on any HTML snippet or full page at absolutely no cost, forever.
100% Private
All analysis runs entirely in your browser. Your code and HTML are never sent to any server — complete privacy is guaranteed at every step.
Instant Results
No waiting, no queues. Results appear the moment you click Scan — powered by client-side JavaScript analysis for zero-latency feedback.
Actionable Fixes
Every issue includes a specific code fix example — not just a description of the problem, but exactly what to change in your HTML to resolve it.
WCAG Aligned
Checks are aligned with the Web Content Accessibility Guidelines (WCAG 2.1), the international standard for web accessibility compliance.
Works Everywhere
Fully responsive and tested across Chrome, Edge, Firefox, and Safari on both desktop and mobile — no plugins or extensions needed.
Features of Our Accessibility Scanner
ARIA Label Checker
Detects buttons, links, and interactive elements that lack descriptive ARIA labels or accessible names required by screen readers.
Color Contrast Analyzer
Identifies inline color and background-color combinations that fall below WCAG's minimum 4.5:1 contrast ratio for readable text.
Image Alt Text Check
Flags all images missing alt attributes or using empty, file-name-based, or generic alt values that provide no useful context.
Form Label Validator
Checks that every form input, select, and textarea is properly associated with a descriptive label element for assistive technologies.
Heading Structure Audit
Validates that heading tags (H1–H6) follow a logical, sequential hierarchy without skipping levels that could disorient screen reader users.
Severity Categorization
Issues are sorted into Errors (must fix), Warnings (should fix), and Info (consider fixing) for clear prioritization of your remediation efforts.
Who Can Use This Tool?
Web Developers
Quickly audit new components or full pages during development to catch accessibility regressions before they reach production.
UI/UX Designers
Validate that your HTML prototypes and design implementations meet WCAG standards before handing them off to development teams.
Content Creators
Check blog posts, articles, and landing page HTML for missing image alt text and improper heading structures that hurt both SEO and accessibility.
Business Owners
Verify that your website meets legal accessibility requirements and avoid costly ADA compliance issues by regularly auditing your web pages.
Students & Educators
Learn web accessibility best practices by scanning code examples and seeing exactly which guidelines apply and why they matter.
QA Testers
Incorporate quick accessibility checks into your QA workflow to catch issues alongside functional bugs before release.
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Frequently Asked Questions
Yes, it is 100% free with no hidden fees, no subscriptions, and no usage limits. You can scan as many HTML snippets and pages as you want without spending anything at all.
Absolutely. All analysis happens entirely inside your browser using JavaScript. Your HTML code is never uploaded to any external server and is never shared with any third party. Your code stays completely private on your own device throughout the entire process.
The scanner checks against the Web Content Accessibility Guidelines (WCAG 2.1), the internationally recognized standard for web accessibility. Checks cover ARIA labeling, color contrast ratios, alt text requirements, form label associations, and heading hierarchy rules.
This tool catches many of the most common and impactful accessibility issues automatically. However, some issues — like logical reading order, focus management in JavaScript interactions, and complex ARIA widget patterns — require manual testing with real assistive technologies. Always supplement automated checks with real-user testing.
Errors are definite accessibility barriers that must be fixed — they directly prevent users with disabilities from accessing content. Warnings are issues that should be addressed as they may cause problems for some users. Info items are best practices or suggestions that improve accessibility but are not strict failures.
You can scan both — paste a small HTML component, a section of a page, or an entire full-page HTML document. The scanner works on any valid HTML regardless of size, as long as your browser can handle the amount of content.
No installation and no account is required whatsoever. Simply open the page in your browser, paste your HTML, select scan options, and click Scan. The entire tool runs inside your browser with zero setup required.
For best results, use the latest version of Google Chrome, Microsoft Edge, or Firefox. Safari on macOS and iOS also works well. All modern browsers fully support the JavaScript APIs used for accessibility analysis.