What is website accessibility?
Web accessibility is the practice of removing the barriers that prevent people with disabilities from using websites. An accessible site can be read aloud coherently by a screen reader, operated entirely from a keyboard, understood at 200% zoom, watched with captions, and completed - forms, checkout, sign-up - without help.
The needs it serves span four broad groups: visual (blindness, low vision, color blindness), hearing (deafness, hard of hearing), motor (tremor, paralysis, limited dexterity) and cognitive (dyslexia, ADHD, memory and processing differences). It also quietly serves everyone else: the parent holding a baby with one hand, the commuter watching without sound, the aging eyes reading your fine print.
Why it matters: risk, reach and revenue
- Legal exposure is real and growing. More than 5,000 accessibility lawsuits were filed in the US in 2025, and regulators in the EU now enforce the European Accessibility Act, in force since 28 June 2025. Notably, over a quarter of sued sites had an accessibility widget installed - a tool alone is not a compliance strategy.
- The audience is enormous. The WHO estimates 1.3 billion people - about 1 in 6 - live with a significant disability. Add temporary and situational limitations and the share of visits affected grows further. Inaccessible sites turn all of them away, usually silently.
- Accessibility compounds with SEO and UX. The same structure that serves a screen reader - real headings, descriptive links, alt text, logical order - is what search engines parse. Accessible sites are typically faster to navigate and convert better for every user.
The most common accessibility barriers
Large-scale scans of the web (WebAIM's annual survey of the top million homepages) find the same failures year after year - roughly 96% of homepages have detectable WCAG failures, dominated by:
- Low-contrast text - the most common failure on the web (1.4.3)
- Images without alternative text (1.1.1)
- Unlabeled form inputs (3.3.2)
- Empty or meaningless links - "click here", icon links with no name (2.4.4)
- Keyboard traps and unreachable controls (2.1.1)
- Missing document language (3.1.1)
- Media without captions (1.2.2)
- Inaccessible PDFs - the forgotten half of most websites (WCAG for PDFs)
The standards and laws that define "accessible"
"Accessible" is not a feeling - it is measured against the Web Content Accessibility Guidelines (WCAG), published by the W3C. WCAG defines testable success criteria at three levels, and Level AA of WCAG 2.1 / 2.2 is the bar nearly every law references:
| Law | Where | What it requires |
|---|---|---|
| ADA | United States | Equal access to goods and services; courts treat WCAG AA as the benchmark. The Title II rule sets WCAG 2.1 AA for state and local government (2027/2028 deadlines). See the full ADA compliance guide. |
| European Accessibility Act | EU | WCAG-based EN 301 549 for e-commerce, banking, transport and more - in force since June 2025 |
| Section 508 | US federal | WCAG 2.0 AA for federal agencies and suppliers |
| AODA, UK Equality Act, IS 5568... | Canada, UK, Israel and beyond | National laws referencing WCAG AA |
How to make your website accessible
- Measure where you stand. Run a free scan with the accessibility checker for a single page, or crawl the whole site with the accessibility crawler. This gives you the machine-detectable failures - roughly a third of the criteria.
- Fix the code at the source. Templates and components first: one fixed component closes hundreds of page failures. The criteria library shows exactly how to fix each failure, with examples.
- Add the visitor-side layer. An accessibility widget gives every visitor assistive functions - magnification, contrast modes, link highlighting, reading guides - and resolves many common issue patterns automatically.
- Cover your documents. PDFs are part of your website in every legal sense - check and remediate them with the PDF accessibility suite.
- Test with humans, then document. Certified auditors cover the two thirds of criteria automation cannot judge, and the result becomes evidence: an audit report or a VPAT.
- Monitor, because sites drift. Every release can break something that passed. Continuous monitoring catches regressions before users - or plaintiffs - do.
Accessibility certification and proof
There is no single global "accessibility certificate" - what organisations actually use as proof is documented conformance: a dated audit against WCAG by qualified specialists, an Accessibility Conformance Report (VPAT/ACR) for procurement, and an accessibility statement describing the standard met and the contact route for issues. Anyone promising a certificate that "makes you immune to lawsuits" is selling paper, not conformance - what stands up is evidence of testing and remediation.
Frequently asked questions
What is website accessibility?
The practice of designing and building websites so people with visual, hearing, motor and cognitive disabilities can perceive, operate and understand them - measured against the WCAG standard.
What is the difference between web accessibility and ADA compliance?
Web accessibility is the practice; ADA compliance is meeting the legal requirements the Americans with Disabilities Act places on it in the US. WCAG Level AA is the technical benchmark used for both.
How do I check if my website is accessible?
Start with a free automated scan, which finds roughly a third of issues - contrast, alt text, labels, ARIA. A full picture requires manual testing with keyboard and screen readers against every WCAG criterion.
Does an accessibility widget make my site accessible?
It solves the visitor-adjustment layer and many common issue patterns, but conformance is a property of your pages. The effective model combines a widget, code fixes, expert testing and monitoring - over a quarter of sued sites in 2025 had a widget installed.
Does web accessibility help SEO?
Substantially. Headings, alt text, descriptive links, logical structure and captions are the same signals search engines parse. Accessibility work and SEO work overlap heavily.
How much of my site does automation fix?
Automated tools detect and resolve a large share of the common, machine-recognizable patterns - roughly a third of WCAG criteria are machine-checkable. The remainder needs human judgement, which is why serious programs combine both.
- World Health Organization, Disability fact sheet - who.int
- WebAIM, The WebAIM Million - annual accessibility analysis of the top 1,000,000 homepages - webaim.org
- W3C WAI, Introduction to Web Accessibility - w3.org/WAI
- US Department of Justice, ADA.gov web guidance - ada.gov
Last updated . Reviewed by the EqualWeb accessibility team.
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