Accessible Design – Creating Accessible Websites for Everyone

Accessible design ensures that websites, apps, and digital content can be used by all people – regardless of physical or cognitive impairments. What used to be considered a niche workaround is now a legal requirement and a measurable quality benchmark for every digital service.

Check design now What is accessibility?
Accessible design – creating accessible websites for everyone

The Key Facts at a Glance

Accessible Design at a Glance

These four points summarize what accessible design means and why it's mandatory today.

  • check Designs websites and digital content so all people can fully perceive, understand, and operate them
  • check International standard: WCAG with four core principles – perceivable, operable, understandable, robust
  • check Applies to companies with 10+ employees or €2 million+ in annual revenue
  • check Can be measured automatically, for example with SiteCockpit's easyMonitoring
Accessible design – the key facts at a glance
check 1.3 billion people worldwide live with disabilities
check Mandatory under the BFSG since June 28, 2025
check Better design for all users

What is accessible web design?

Accessible web design means designing websites and digital content in a way that allows as many users as possible to fully perceive, understand, and operate them – including people with visual, motor, cognitive, or auditory impairments. The goal is not a separate workaround for a minority, but a single accessible design that serves everyone.

The international standard for accessible design is the Web Content Accessibility Guidelines (WCAG). The current guidelines define four core principles and specific success criteria for web design, web applications, apps, and digital documents. Requirements for color contrasts, text readability, keyboard navigation, or screen reader compatibility are just as much a part of accessible design as a clear content structure and understandable language.

Since June 28, 2025, the Accessibility Strengthening Act (BFSG) legally obligates companies with at least ten employees or an annual turnover of two million euros to offer digital products and services accessibly. Accessible design is therefore no longer an optional nice-to-have – it is a legal requirement and an essential part of a responsible digital strategy.

The four core principles of accessible design

All requirements for accessible web design can be traced back to four foundational principles – known as the POUR model of the WCAG.

Perceivable

All content must be presented in a way that users can perceive it – regardless of sensory organs. Images require alt texts, videos need captions, and texts require sufficient contrast.

Operable

All functionalities must be operable via keyboard. Interactive elements require visible focus indicators. Click targets must be large enough – at least 24×24 pixels.

Understandable

Content and operation must be clear to all users. Plain language, consistent navigation, and informative error messages are central design requirements.

Robust

Design and code must function reliably with assistive technologies like screen readers – today and with future technical developments.

Contrast, images, and text – specific design requirements

Accessible design begins with the visible elements of a website. These requirements have the greatest impact on accessibility for individuals with visual, cognitive, and motor impairments:

  • check Color contrast: regular text at least 4.5:1 against the background, large text at least 3:1
  • check Alt texts: all informative images require precise textual descriptions for screen readers
  • check Decorative images: purely decorative graphics are marked with an empty alt attribute
  • check Text size & line spacing: content must remain readable up to 200% zoom without losing information
  • check Link texts: descriptions must clearly name the link destination – avoid "click here"
  • check Color as the sole signal: visual cues must not be conveyed by color alone
Check contrast directly
Accessible design – contrast, alt texts, and text requirements

Keyboard, Focus & Screen Readers

Screen readers, keyboard navigation, and focus – accessible interaction

Accessible web design does not end with visual appearance. For people who use a website via keyboard or screen reader, structure, sequence, and operability are critical:

  • check Visible focus indicator: all interactive elements clearly show where the focus is located
  • check Focus is not obscured: sticky headers or overlays must not overlap the active focus element
  • check Click targets: minimum size of 24×24 pixels – with sufficient spacing from neighboring elements
  • check Screen reader logic: semantic HTML, correct heading hierarchy, and ARIA labels where necessary
  • check No keyboard traps: users must be able to reach and leave all areas using only the keyboard
  • check Declare language: the HTML lang attribute allows screen readers to apply the correct pronunciation
More about screen readers
Accessible design – screen readers, keyboard control, and focus indicators

SiteCockpit easyMonitoring

Uncover where Your design creates barriers

Go to easyMonitoring

Typical design flaws and how You can avoid them

Many barriers do not arise intentionally, but rather out of unconsidered design choices. These flaws are particularly common in practice – and relatively straightforward to fix during implementation:

  • check Insufficient contrast – for example, light gray text on a white background
  • check Missing or meaningless alt texts for informative images and icons
  • check Interactive elements lacking a focus indicator – making them invisible to keyboard users
  • check Click targets that are too small or too close together – particularly critical on mobile apps
  • check Purely color-based error indicators without additional textual or symbolic hints
  • check Missing language declaration in the HTML – causing screen readers to mispronounce content
Common barriers at a glance
Typical design flaws in web accessibility and how to fix them

Frequently Asked Questions about Accessible Design

Screen readers cannot process visual images. Alt texts provide individuals who use screen readers with a textual alternative to the image content. Informative graphics need precise descriptions that convey context. Decorative elements get an empty alt attribute (alt=""), prompting screen readers to skip them silently without announcing redundant info.

Many individuals cannot use a mouse – they navigate exclusively via keyboard or assistive devices. Accessible design guarantees that all interactive components can be focused via keyboard and display a visible focus indicator. Furthermore, click targets must be large enough (at least 24×24 pixels) and feature sufficient spacing from adjacent items – which is highly relevant for mobile applications.

Accessible design can be verified using automated auditing tools combined with manual reviews. easyMonitoring by SiteCockpit automatically inspects websites for WCAG compliance, pinpointing precisely where design choices introduce barriers – from insufficient contrast to missing alt tags. This visualizes concrete actionable issues without requiring a manual page-by-page hunt.

Yes – accessible design improves user experience for everyone. High contrast levels assist reading under bright sunlight, plain phrasing makes content easier to digest, and consistent navigation reduces cognitive load for all visitors. Many core tenets of accessibility align seamlessly with good UX principles: prioritizing clarity, consistency, and comprehension for every single user.