Accessibility Tools
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Useful tools to check and improve the accessibility of your website. All tools are free to use.
Free bookmarklet
WCAG Radar
Drag the button below to your bookmarks bar once. Then click it on any page, including behind a login or on localhost. Nothing is sent or stored.
Drag the button, don't click it. Can't see your bookmarks bar? Press Ctrl + Shift + B (Windows) or ⌘ + ⇧ + B (Mac).
- Runs entirely in your browser
- No installation, no account
- Works behind a login and on localhost
- Sends nothing
Colour contrast checker — does your colour combination meet WCAG?
Free colour contrast checker. Check if your colour combination meets WCAG 2.2 level AA and AAA. Enter two colours and see the result instantly.
Does your text stay readable with more space between it?
Free tool that shows whether your text stays readable when visitors add more space between letters, words and lines. Drag the button to your bookmarks bar or play with the example.
ARIA Roles & Attributes Reference
Search and explore WAI-ARIA roles and attributes. View descriptions, supported attributes, HTML equivalents and practical code examples.
Error messages reference
Find good error messages for every form field type. With examples of what to write and what to avoid, according to WCAG.
PDF accessibility checker Beta
Upload a PDF and automatically check for common accessibility issues. Checks tags, title, language, headings, images, lists and tables.
Alt text decision tree
Not sure what alt text to write? This interactive decision tree guides you step by step to the right alt text.
Need more?
We also build custom tools for our clients. Need a specific tool or automation? Discuss the options with Julia Tol.
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Proper Access Toolsuite
We built an application with 9 tools that allow web editors to independently check their content for accessibility. No technical knowledge needed, no HTML required.
The tools don't just flag issues — they also explain why something is a problem and how to fix it. So you learn while you check.
The toolsuite includes checkers for heading structure, alt texts, links, tables, semantics, error messages, iframes, language and page titles.
Contact us for a subscription