Accessibility Checker
Test your website against WCAG 2.1 accessibility guidelines. Make your site usable for everyone, including people with disabilities.
Free • No Registration • Lighthouse Powered
What Is Web Accessibility?
Web accessibility means that websites, tools, and technologies are designed and developed so that people with disabilities can use them. This includes people with visual, motor, auditory, speech, and cognitive disabilities. Accessibility also benefits everyone - including older people, people on mobile devices, and those with temporary limitations.
Why Does Accessibility Matter?
Reach More People
Over 1 billion people worldwide live with some form of disability. Accessible sites reach this enormous audience.
Legal Compliance
Many countries require WCAG compliance by law (ADA, EAA, AODA). Non-compliance can lead to lawsuits.
Better SEO
Many accessibility practices overlap with SEO: clear headings, descriptive alt text, and proper HTML semantics.
Better UX for Everyone
Accessibility improvements like larger tap targets and better contrast make the site easier to use for all users.
What Does the Accessibility Checker Test?
- Image alt text: All meaningful images must have descriptive alternative text.
- Contrast ratios: Text must have sufficient contrast against its background (4.5:1 for normal text).
- Heading structure: Headings must be ordered hierarchically for screen readers.
- Form labels: All form fields must have associated labels.
- ARIA attributes: Landmarks and roles used correctly for assistive technology.
- Link names: Links must have discernible, descriptive text.
- Tap targets: Interactive elements must be large enough to tap easily.
- Viewport and zoom: Content must be usable when text is resized and zoomed.
- Document language: Page must declare its language in the HTML tag.
Core Accessibility Principles
The WCAG guidelines are organized around four principles, known by the acronym POUR:
Perceivable
Information and UI must be presentable to users in ways they can perceive. Provide text alternatives for non-text content.
Operable
UI and navigation must be operable. All functionality must be usable with a keyboard. Never rely on color alone to convey info.
Understandable
Information and operation of the UI must be understandable. Make text readable, and ensure predictable navigation.
Robust
Content must be robust enough that it can be interpreted reliably by a wide variety of user agents, including screen readers.
How to Improve Accessibility
- Run the accessibility checker and review failed audits in your report.
- Add descriptive alt text to all meaningful images.
- Ensure proper color contrast using a contrast checker tool.
- Add labels to all form inputs.
- Structure pages correctly with a single H1 and logical H2/H3 hierarchy.
- Test navigation using only a keyboard (Tab, Enter, arrows).
- Test your site with a screen reader like NVDA or VoiceOver.
- Re-run the accessibility checker to confirm improvements.
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- Core Web Vitals Test – LCP, INP and CLS against Google's thresholds.
- SEO Checker – titles, meta tags, headings, links and structured data.
- Accessibility Checker – WCAG checks for contrast, labels and keyboard use.
- Website Security Test – HTTPS, security headers and mixed content.
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