How to use Accessibility Checker online, free

Run quick accessibility checks against a page's HTML, flagging common issues that make a site harder to use for people with disabilities - like missing alt text on images, poor color contrast, or missing form labels. It's a fast first-pass audit, not a full replacement for comprehensive accessibility testing.

SEO and webmaster checks are only useful if they match what Googlebot or a browser would see. Guessing from the HTML source alone is how people ship broken tags.

Accessibility Checker is a good fit when pre-release QA for public-facing websites.

Why this exists

Accessibility Checker is built around a few practical wins, not a long feature list:

• Finds high-impact accessibility issues quickly.
• Improves usability for all users, not only assistive-tech users.
• Supports compliance readiness and audit preparation.
• Great first pass before deeper manual accessibility testing.

Walkthrough

1. Analyze page markup. Scan HTML for common WCAG-related structural and attribute issues.
2. Review flagged findings. Check missing labels, alt text, contrast, and heading/navigation problems.
3. Apply accessibility fixes. Update templates/components to address root causes, not one-off pages only.
4. Retest and verify manually. Run checker again and validate with keyboard/screen-reader walkthroughs.

Jobs it is built for

• Pre-release QA for public-facing websites.
• Improving accessibility scores in procurement/compliance contexts.
• Auditing legacy pages for WCAG modernization.
• Teaching teams common accessibility anti-patterns.

Worth knowing before you start

• Automated checks are a start; always pair with manual keyboard tests.
• Fix design-system components to eliminate repeated page issues.
• Use meaningful alt text for informative images only.
• Track recurring findings to improve content team workflows.

What not to expect

• Treating automated pass as full accessibility compliance proof.
• Adding decorative alt text that creates screen-reader noise.
• Fixing one page while reusable templates remain broken.
• Ignoring focus order and keyboard navigation behavior.

Privacy, in one paragraph

Accessibility Checker needs the ToolBox API for work a browser cannot do. What you submit is processed, then discarded. It is not kept as a library of your files.

Related tools worth opening next

If this is one step in a longer job, these usually come after it:

• Color Contrast Checker - Check WCAG accessibility compliance
• HTML Heading Checker - Inspect h1-h6 heading structure and SEO hierarchy
• Website Speed Test - Real browser-rendered GTmetrix-style report: grade, Core Web Vitals, page weight and fix recommendations

Short answers

Does passing these checks guarantee my site is fully accessible?

No - automated checks catch common, detectable issues (like missing alt text or contrast problems) but can't evaluate everything accessibility requires, like whether content makes logical sense to a screen reader user or whether keyboard navigation genuinely works well. Use this as a helpful first pass, not a complete accessibility audit.

What kinds of issues does it typically catch?

Common ones include missing image alt text, insufficient color contrast, missing form labels, and improper heading structure - the kinds of issues automated tools can reliably detect from HTML alone.

Why does accessibility matter for my website?

It ensures people with visual, motor, or cognitive disabilities can actually use your site, and is increasingly a legal/compliance requirement in many regions - beyond that, many accessibility fixes (like clear headings, good contrast) also improve usability for everyone.

Open the Accessibility Checker when you are ready. It is free, and you do not need an account.