WCAG Accessibility with TTS: Compliance Guide

Accessibility isn't optional anymore. The EU Accessibility Act (in full force since June 2025) makes digital accessibility legally mandatory for most businesses operating in the EU.

Relevant WCAG 2.2 Guidelines

• 1.2.1 Audio-only and Video-only (Prerecorded) — Provide alternatives for time-based media
• 1.2.2 Captions (Prerecorded) — Captions for all video audio
• 1.2.3 Audio Description or Media Alternative — Describe visual content
• 1.4.2 Audio Control — Users must control auto-playing audio
• 2.2.1 Timing Adjustable — Users control timing
• 3.1.1 Language of Page — Declare language programmatically

Where TTS Helps

Audio alternatives for text — Readers with dyslexia, low vision, or cognitive disabilities benefit from audio. Offering a "Listen to this article" button adds an accessibility layer.

Video audio descriptions — Describe visual content for blind users. Generate these with TTS, mix into secondary audio track.

Error messages — For users with cognitive disabilities, hearing error messages alongside visual display improves comprehension.

Navigation aids — Screen reader alternative for users who don't use AT but benefit from audio cues.

Implementation Pattern

"Listen to this article" button

<button id="listen-btn" aria-label="Listen to article">
  <svg>...</svg> Listen
</button>

<script>
document.getElementById('listen-btn').addEventListener('click', async () => {
  const text = document.querySelector('article').textContent;

  const response = await fetch('/api/generate-audio', {
    method: 'POST',
    body: JSON.stringify({ text })
  });

  const blob = await response.blob();
  const audio = new Audio(URL.createObjectURL(blob));
  audio.play();
});
</script>

Audio controls

Always provide play/pause/stop and playback speed controls. Users need to interrupt audio.

Don't autoplay

WCAG 1.4.2 prohibits audio that plays automatically for more than 3 seconds without user control.

Beyond WCAG: Universal Design

TTS benefits users without disabilities too: commuters, multitaskers, ESL learners. Accessibility investment has universal ROI.

Legal Risk

US ADA lawsuits against non-accessible websites hit record levels in 2025. Most settlements: $20K-$50K plus remediation costs.

Getting Started

Add accessibility to your site with a single API call.