WCAG Compliance Checker: How to Test Your Website (2026 Guide)

What a WCAG compliance checker does

A WCAG compliance checker loads a page the way a browser does, then evaluates the rendered HTML, ARIA attributes, and computed styles against the Web Content Accessibility Guidelines. Each rule maps to one or more success criteria — for example missing image text maps to 1.1.1 Non-text Content, low contrast maps to 1.4.3 Contrast (Minimum), and an input without a programmatic label maps to 3.3.2 Labels or Instructions. The output is a list of pass and fail results, usually grouped by severity, with a pointer to the criterion so you know exactly what to fix.

You can run a check on any public page with the free accessibility checker. It returns a plain-language report in about a minute, with no signup, so it is a practical first step before you commit to a deeper audit.

What a checker can and cannot detect

This is the single most important thing to understand. Automated tools are excellent at the machine-verifiable criteria and useless at the ones that require human judgement. Independent studies consistently find that automated scanning catches roughly 30 to 50 percent of WCAG issues. The checker is a powerful filter, not a certificate.

A checker can reliably detect:

Missing or empty alt attributes on images
Text and background colour contrast below the required ratio
Form controls without an associated label
Invalid or broken ARIA roles, states, and relationships
Missing document language, page title, or heading structure problems
Duplicate IDs and other parsing issues that affect assistive technology

A checker cannot judge:

Whether alt text is meaningful or merely present
Whether the reading and focus order is logical
Whether the whole page is operable with a keyboard alone
Whether error messages and instructions make sense to a real user
Whether content is understandable to people with cognitive disabilities

How to run a WCAG compliance check properly

Treat the checker as the first stage of a repeatable process, not the whole job:

1. Scan representative pages. Test your homepage, a key template page, a form, and your checkout or contact flow — not just one URL. Start with a free accessibility scan of each.
2. Read the per-criterion breakdown. A good report cites the exact WCAG criterion for each issue. The WCAG audit gives you a criterion-by-criterion view of what passes and what fails against WCAG 2.1 and 2.2.
3. Fix by legal and user risk first. Contrast, labels, and keyboard traps affect the most users and carry the most legal weight. Resolve those before cosmetic warnings.
4. Add manual testing. Tab through every page with the keyboard, test with a screen reader, and confirm the reading order matches the visual order. This covers the criteria the checker cannot reach.
5. Re-check after every change. Accessibility regressions slip in with a single template edit, so make checking part of your release routine.

Which standard to test against in 2026

Test against WCAG 2.2 Level AA. It is the version referenced by the European Accessibility Act, by ADA-related guidance in the US, and by EN 301 549 in Europe. Level AA is the conformance target expected of public commercial websites; Level A alone leaves obvious gaps, and Level AAA is rarely required across an entire site. WCAG 2.2 added nine new success criteria over 2.1 — including focus appearance and accessible authentication — so a checker built around the older version will miss them.

From checker to documented conformance

Once your automated and manual checks are clean, document the result. An accessibility statement records the standard you target, your conformance status, and any known limitations — and it is expected under several regulations. After you have run a WCAG compliance check and remediated the findings, you can publish one with the accessibility statement generator so your declared status reflects what the checker and your manual review actually found.

Frequently asked questions

What is a WCAG compliance checker?

A WCAG compliance checker is a tool that loads a web page and evaluates its HTML, ARIA, and styling against the Web Content Accessibility Guidelines. It reports which success criteria pass or fail — for example missing alt text (1.1.1), insufficient colour contrast (1.4.3), or empty form labels (3.3.2) — and usually links each finding to the relevant WCAG documentation so you can fix it.

Can a WCAG checker prove my site is fully compliant?

No. Automated tools reliably detect roughly 30–50% of WCAG issues. The rest — meaningful alt text, logical reading order, keyboard operability, and the screen-reader experience — needs human judgement. A checker tells you which machine-detectable criteria fail; full conformance also requires manual testing against the remaining criteria.

Which WCAG version and level should I test against?

Target WCAG 2.2 Level AA. It is the version referenced by the European Accessibility Act and by most current regulations, and Level AA is the conformance level expected of public-facing commercial sites. Level A is the bare minimum and Level AAA is rarely required site-wide.

How often should I run a WCAG compliance check?

Run a check before every release that changes the user interface, and schedule a recurring scan at least monthly for live pages. Accessibility regressions are easy to introduce with a single template change, so continuous checking catches problems before users — or regulators — do.

Check your site now

The fastest way to know where you stand is to run a check. Start with a free accessibility checker, review the detailed results in a WCAG audit, fix the issues by priority, then re-scan to confirm. A WCAG compliance checker will not make your site conformant on its own — but it tells you, in minutes, exactly where to begin.