Website Accessibility Checker: How to Test, Fix, and Stay WCAG Compliant

Most web accessibility issues are easier to fix when you catch them early. A website accessibility checker helps website owners, developers, and content teams identify errors before they become accessibility barriers for users or compliance violations for the business.

In this guide, you’ll learn how to run a fast accessibility test, what automated tools can and cannot detect, which tools to use, and when it makes sense to bring in accessibility experts.

Start here: quick website accessibility check in 3 steps

You can test your site right away with a free website accessibility checker. The fastest way to start accessibility testing is to use the free House of Angular accessibility checker at https://wcag.houseofangular.io/.

Here is a simple workflow you can follow today:

1. Enter your website URL
   Add a page such as https://example.com/blog/product-guide and start an automated scan.
2. Wait for the scan to finish
   In a few seconds, the accessibility checker analyzes your code, page structure, color contrast, alt text, keyboard focus, accessible names, and other technical signals that affect access.
3. Review the report
   Check the results summary for the total number of accessibility issues, severity levels, and a list of accessibility problems found on the page.

The House of Angular checker is a free tool that does not require registration for a basic scan and can be repeated after every deployment. That makes it practical for regular automated checks during the development process, not just before a major launch.

What is a website accessibility checker?

A website accessibility checker is an automated software tool that scans a website’s code and design to detect barriers that prevent people with disabilities from using it. In practice, it evaluates web pages against accessibility standards such as WCAG 2.1, WCAG 2.2, and Section 508.

The Web Content Accessibility Guidelines (WCAG) are the most important guidelines for web accessibility policy, created by the World Wide Web Consortium (W3C). You may also see them referred to as WCAG guidelines or WCAG standards. They help teams create web content that is perceivable, operable, understandable, and robust.

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📚 Learn more about WCAG in our Web Content Accessibility Guidelines Practical 2026 Guide.

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An accessibility checker focuses on technical accessibility barriers such as missing form labels, low contrast text, missing alt text, invalid ARIA, keyboard traps, and interactive elements that are hard to use with assistive technologies. Website accessibility checkers identify barriers that prevent assistive technologies from interpreting a website.

There are two common types of said checkers:

• Single-page checkers: best when developers need to test one screen, one component, or one template during development.
• Full-site crawlers: best when website owners need to evaluate many pages, monitor progress, and manage accessibility compliance over time.

Many automated tools use engines such as Axe Core, browser DevTools APIs, HTML parsing, and rendered DOM inspection. These tools evaluate a website’s code and content, flagging accessibility issues and often providing guidance on how to fix them, which saves time for developers.

A checker can:

• Find common WCAG issues such as missing labels, broken ARIA, poor color contrast, and empty headings.
• Give an accessibility score or issue count.
• Help developers fix accessibility issues faster.
• Track progress after each release.

A checker cannot:

• Fully judge whether content is clear.
• Confirm whether captions and transcripts are accurate.
• Know if alt text truly explains the purpose of an image.
• Replace manual testing with a screen reader, keyboard, and real users.

Why accessibility testing matters in 2026

Accessibility testing matters because it connects user experience, accessibility compliance, SEO, brand reputation, and legal risk. If users cannot browse, search, buy, register, or contact you, the website is not doing its job.

Failure to comply with accessibility standards such as the WCAG can lead to legal actions against organizations, as seen in various jurisdictions, including the United States and Canada. 

In the United States, the Americans with Disabilities Act (ADA) requires that private businesses ensure their websites are accessible, which is often interpreted as needing to comply with the Web Content Accessibility Guidelines (WCAG). 

ADA Title III does not formally mandate a specific WCAG version for private websites. However, WCAG 2.1 Level AA is commonly used as the practical benchmark in litigation, settlements, and accessibility programs, making it practical for businesses to adhere to these standards to avoid legal issues.

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🌎 Own a website in the U.S.? Learn all about ADA Website Compliance requirements in this article.

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The Accessibility for Ontarians with Disabilities Act (AODA) requires many public and private organizations in Ontario to meet WCAG 2.0 Level AA requirements, subject to specific scope and exemptions, with significant penalties for non-compliance.

In Europe, the European Accessibility Act (EAA) mandates that private European websites must be accessible and comply with its requirements since June 28, 2025, aligning with WCAG standards. This is why many teams now treat the European Accessibility Act compliance as a board-level requirement, especially in e-commerce, banking, transport, and digital services.

The human impact is just as important. Web accessibility issues affect screen reader users, keyboard-only users, people with color blindness, people with low vision, users with hearing impairments, and people with cognitive disabilities. For example, if a checkout button has no accessible name, it may be invisible to apps such as Android TalkBack on mobile devices, even though it looks fine visually.

Regular testing helps you:

• Reduce legal risk and avoid complaints, audits, or lawsuits.
• Improve usability for users with disabilities and for everyone else.
• Create clearer navigation, stronger structure, and better forms.
• Increase conversions by removing barriers from key journeys.
• Keep your site aligned with changing accessibility standards.

Key accessibility issues a checker will find

A good accessibility checker can highlight common accessibility problems directly on the page.

• Color contrast
  • Low-contrast text is hard to read for people with visual impairments and color blindness.
  • WCAG AA generally requires a 4.5:1 ratio for normal text and 3:1 for large text.
  • A built-in color contrast checker can highlight failing foreground and background combinations.

• Images and alt text
  • Missing alt text is one of the most common accessibility issues.
  • Decorative images should usually have empty alt attributes.
  • Complex charts, diagrams, and product images may need more detailed descriptions.
  • Testing for visual impairments includes ensuring sufficient color contrast and providing alt text for images.

• Structure and headings
  • Skipping from H1 to H4 can make the page harder to navigate.
  • Missing landmarks such as header, main, nav, and footer reduce screen reader navigation quality.
  • Cognitive impairments testing flags confusing heading structures and missing labels, aiding user navigation and understanding.

• Forms and labels
  • Inputs without labels are difficult for screen reader users.
  • Placeholder-only labels disappear when users type.
  • Error messages must be tied to fields with the right ARIA attributes.

• Keyboard access
  • Focus must be visible.
  • Focus order should be logical.
  • Keyboard navigation testing confirms that all links, buttons, and forms are fully navigable using only a keyboard or assistive switches.
  • Buttons, menus, tabs, and modal dialogs must work with Tab, Shift+Tab, Enter, and Space.

• ARIA misuse
  • Broken roles and attributes can create more problems than they solve.
  • Widgets should expose state, such as expanded, selected, or pressed.
  • Automated tools are great for initial audits and catching blatant errors like missing image alt-text or broken ARIA tags.

• Multimedia
  • Hearing impairments testing prompts developers to include captions and transcripts for multimedia content.

Automated tools vs manual accessibility testing

Automated accessibility tools are essential, but they cannot replace expert human testing. 

Automated testing identifies only a subset of accessibility issues, meaning manual checks are required for real-world usability.

Automated tools do well at finding:

• Missing alt text.
• Low color contrast.
• Invalid ARIA.
• Missing form labels.
• Empty buttons or links without accessible names.
• Structural errors in headings and landmarks.
• Some keyboard navigation problems.
• Repeated code-level errors across templates.

Automated tools cannot reliably judge:

• Whether “click here” makes sense in context.
• Whether video captions are accurate.
• Whether a product description is clear.
• Whether a form error is understandable.
• Whether a complex widget is pleasant to use with a screen reader.
• Whether mobile accessibility works well across real devices.

The most effective approach to website accessibility combines automated scanning tools with manual testing. 

A practical workflow looks like this:

1. Run automated testing with the House of Angular checker.
2. Fix high-severity issues first.
3. Perform manual accessibility testing with real assistive technologies.
4. Re-run automated scans after each batch of fixes.
5. Document remaining accessibility gaps and plan follow-up work.

Key manual checks include:

• Navigate the full site using only a keyboard.
• Test with NVDA or JAWS on Windows.
• Test with VoiceOver on macOS and iOS.
• Test Android TalkBack on Android mobile devices.
• Review zoom behavior at 200–400%.
• Confirm that alerts and errors are announced properly.

If your team lacks the time or expertise, you can outsource manual audits and remediation planning to House of Angular’s accessibility experts.

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📌 What does all this mean for your business? Read “Digital Accessibility After 2025. What Does It Mean for Business Today?” to find out. 

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Recommended accessibility checkers and tools to use

Most teams combine several tools for coverage and convenience. The goal is not to collect reports, but to build a practical toolkit that helps you identify, prioritize, and fix accessibility issues.

1. House of Angular Free Accessibility Checker

Start with the House of Angular accessibility checker. 

It is the primary recommendation for automated accessibility testing of any public website. It scans for key WCAG 2.2 failures, groups issues by severity, and provides practical fix hints.

House of Angular can also provide a professional service to fix identified accessibility issues, support audits, prepare remediation plans, and integrate testing into CI/CD workflows.

2. Axe Core and related developer tools

Axe Core is a popular open-source testing engine used by many accessibility tools, including browser extensions and CI tools. It is useful for automated checks during development and can help teams keep accessibility in the delivery pipeline.

3. Browser DevTools accessibility panels

Chrome and Edge include accessibility and color contrast inspectors. These are useful resources when you need to inspect one element, verify accessible names, or debug the accessibility tree.

4. WAVE and Lighthouse as secondary validation options

WAVE is a widely used browser extension and online service that provides visual feedback of accessibility issues directly on a webpage. Automated accessibility tools like WAVE and Axe DevTools use visual indicators to highlight accessibility errors directly on webpages. Lighthouse in Chrome can also provide a quick accessibility score for a single page.

5. Accessibility Insights for Web and Silktide Toolbar

Accessibility Insights for Web is a Microsoft-built tool that helps test web applications and provides visual guides for keyboard navigation. The Silktide Toolbar is a web accessibility testing tool that performs over 200 WCAG accessibility checks, including color contrast, image alt text, and keyboard navigation problems.

Use these tools together, but keep House of Angular as your starting point for repeatable site-level scanning and expert remediation support.

Chrome extensions and in‑browser accessibility testing

• Many developers prefer a Chrome extension for real-time accessibility testing while creating web pages.
• A typical extension workflow is simple: install it from the Chrome Web Store, open a page, click the extension icon, and review the issue overlays.
• In-browser tools help you test authenticated areas, staging environments, local development sites, and single-page app states that a public crawler may not reach.
• Several Chrome extensions rely on the Axe-Core engine for automated accessibility testing, which gives consistent rule coverage across different tools.
• In-browser testing is especially useful for checking interactive elements such as modal dialogs, dropdowns, accordions, and navigation menus before they reach production.
• Example: After building a new signup form, run the extension, check whether every input has a label, confirm that errors are announced, and verify that the submit button has an accessible name.
• After each major UI change, fix flagged issues in the component, then run a broader web accessibility checker such as the House of Angular tool before releasing.

Testing specific accessibility areas (color, images, structure)

Some of the biggest wins come from three areas: color contrast, images and alt text, and page structure. These are visible, common, and often easy to improve once a report points you to the exact location.

For color, use a color contrast checker to test foreground and background pairs. WCAG 2.1 AA and 2.2 AA expect 4.5:1 for normal text and 3:1 for large text. This matters for users with low vision, users with color blindness, and users on mobile devices in bright light.

For images, use an accessibility checker to list images with missing, empty, or suspicious alt text. Good alt text explains the purpose of the image, not every visual detail.

• Poor: alt=”image”
• Better: alt=”Woman comparing two running shoes in an online store”

For structure, check that the page has one clear H1, a logical H2 and H3 hierarchy, and landmarks such as header, nav, main, and footer. Screen reader users often navigate by headings and landmarks instead of reading every line from top to bottom.

Some accessibility checkers visually overlay these problem areas directly on the page, so designers and developers can see where to fix them.

What to test:

• Color: text contrast, button contrast, focus indicators, hover states.
• Images: missing alt text, decorative images, charts, product photos.
• Structure: headings, landmarks, lists, tables, and reading order.

How to interpret your accessibility report

Automated accessibility testing can produce a comprehensive report that feels overwhelming at first. The key is to prioritize by user impact, not by trying to fix every warning in random order.

A typical report includes an accessibility score, total violations, warnings, best-practice suggestions, affected elements, and references to WCAG success criteria. Start with errors that block access for screen reader or keyboard users. Then move to contrast, structure, labels, and content clarity.

Group issues by component or template whenever possible. If the same button component appears 200 times, fix the component once instead of treating each instance as separate work.

House of Angular’s accessibility experts can turn a raw report from the House of Angular checker into a clear remediation roadmap with estimated effort, timelines, and ownership. This is especially useful when your team needs to show progress to legal, procurement, compliance, or leadership teams.

After receiving a report:

• Fix blockers first, especially form, keyboard, and screen reader issues.
• Group repeated issues by component, template, or design system pattern.
• Document decisions where immediate fixes are not possible.
• Run follow-up accessibility testing after each batch of changes.
• Track progress so accessibility becomes part of delivery, not a one-time audit.

Beyond automated tools: manual testing and assistive technologies

Some accessibility problems only appear when real users and assistive technologies interact with a site. This is where manual testing becomes essential.

Use this checklist:

• Keyboard testing
  • Press Tab through the whole page.
  • Use Shift+Tab to move backward.
  • Use Enter and Space to activate controls.
  • Confirm that focus is visible and follows a logical order.

• Screen reader testing
  • Use NVDA or JAWS on Windows.
  • Use VoiceOver on macOS and iOS.
  • Use Android TalkBack on Android devices.
  • Navigate by headings, landmarks, links, buttons, and form fields.

• Mobile accessibility
  • Test responsive layouts on real mobile devices.
  • Confirm that touch targets are large enough.
  • Check that mobile apps and web apps expose labels, roles, and states correctly.

• Zoom and layout
  • Zoom to 200–400%.
  • Check that content does not overlap or disappear.
  • Confirm that users can still complete key tasks.

• Content and alerts
  • Verify that form errors are announced.
  • Check that dynamic updates are communicated.
  • Review captions, transcripts, instructions, and link text.

W3C Easy Checks provides a beginner-friendly manual first review guide to help identify basic accessibility issues. For deeper testing, organizations can outsource manual testing and remediation to specialists who work daily with assistive technologies and accessibility standards.

When to bring in accessibility professionals

DIY accessibility testing is a strong start, but complex sites often require expert help. This is especially true when your site has large user flows, custom components, legacy code, third-party scripts, or high compliance exposure.

Bring in professionals when:

• You manage a large or legacy codebase.
• You run an e-commerce, public-sector, healthcare, education, or financial services site.
• You are preparing for an audit or procurement review.
• You have received accessibility complaints.
• You need to reduce legal risk quickly.
• Your team keeps fixing the same accessibility problems repeatedly.
• You need help building accessibility into your development process.

For example, an e-commerce team might run a scan in May, discover repeated checkout and navigation errors, spend four to six weeks fixing shared components with professional guidance, and then re-test in July to show measurable progress. The outcome is not just fewer errors, but a more accessible buying journey for users.

Treat accessibility as an ongoing practice. Schedule periodic re-tests, review new features before release, and collaborate with accessibility professionals whenever you redesign, migrate, or add important user flows.

Summary: Build accessibility testing into your workflow

Start with a free automated scan using the House of Angular accessibility checker, then layer in manual testing and expert support. That approach helps you find issues quickly without pretending that automation can catch everything.

The core workflow is simple: run automated checks, fix high-impact issues, validate with keyboard and screen reader testing, and rerun scans after every significant update. Regular accessibility testing reduces legal risk, improves UX for all users, and keeps your site aligned with evolving accessibility standards.

Your next steps:

• Scan your website with the House of Angular free checker.
• Fix the highest-impact accessibility issues first.
• Book expert support if you need manual audits, remediation, or long-term accessibility guidance.

Run your first test today, and if you need experts to handle complex fixes and improve accessibility across your site, contact us here!