Digital accessibility, clearly explained
Accessibility that includes everyone.
Barrierefrei² explains digital accessibility so you can put it into practice right away: every WCAG 2.2 success criterion in plain words, plus practical articles on design, development, content and the European Accessibility Act.
Explore the WCAG guide Read the articles
- 87 WCAG criteria explained
- 12 practical articles
- English & German
WCAG 2.2
Four principles, one goal
The WCAG group every requirement under four principles. Once you understand them, the individual success criteria make sense.
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Perceivable
Content must be available to at least one sense: text alternatives, captions, contrast.
29 criteria
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Operable
Everything must be operable – by keyboard, without time pressure and without triggering seizures.
34 criteria
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Understandable
Text, navigation and forms must be understandable and predictable.
21 criteria
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Robust
Code must be clean enough for assistive technologies to interpret it reliably.
3 criteria
New on the blog
Digital accessibility: what it means and who it helps
Digital accessibility affects far more people than most teams assume. Learn what it really means, which myths keep hanging around and how to get started in a sensible way.
Germany’s BFSG: What the Accessibility Act Asks of You
Since 28 June 2025, Germany’s BFSG has made accessibility mandatory for many consumer-facing digital services. Who is covered, what is required and how to get started.
Accessibility Testing: Tools, Manual Checks and a Test Plan
Automated tools only catch part of the problem. Here’s how to combine tools, manual checks, user testing and formal audits into a test plan your team can actually follow.
For everyone who builds digital products
Design
Contrast, focus, target sizes and layouts that work with zoom and on small screens.
Development
Semantic HTML, keyboard support, ARIA used wisely and components screen readers understand.
Content
Alt text, clear headings, plain language and meaningful link text.
Business
What the European Accessibility Act requires, how to prioritise and how to make accessibility stick in your team.
The European Accessibility Act applies since June 2025
Online shops, banking, e-books and many other digital services must be accessible. Find out what that means in practice and how to get started.
What the law requires