Level AAPerceivable
1.2.4

Captions (Live)

Live video with audio (a launch stream, a live shopping event) needs real-time captions too.

In plain English

If you run live video with audio, a live product launch, a webinar, a live shopping stream, deaf and hard-of-hearing viewers need captions in real time, as the words are spoken. This is the live counterpart to the prerecorded captions rule.

If you do not stream live video, this one simply does not apply to you.

Who this is for

  • Deaf and hard-of-hearing viewers attending your live events.
  • Anyone in a noisy or sound-off environment during the stream.

How to check and fix it yourself

If you host live streams, arrange captions before you go live:

Big or scripted event  → hire a live captioner (CART) for accuracy.   ✓
Smaller/informal        → enable the platform's live auto-captions.    ✓
No live video at all    → not applicable.

Turn on your platform’s live-caption feature and test it before the real event.

Where we can help

If live shopping or webinars are part of your plan, we advise on the captioning setup that fits the event’s size and stakes, so you are covered before you go live. For the wider media picture, see our captions and ADA guide.

How to meet it

Techniques the W3C accepts as sufficient (summarized). Follow a link for the full method.

Frequently asked questions

What does captions (live) require?+

Success Criterion 1.2.4 (Level AA) says live video that has audio, such as a live product launch, webinar, or live shopping event, must have captions provided in real time, so deaf and hard-of-hearing viewers can follow along as it happens.

How do you caption a live stream?+

Options include a live captioner (a professional typing captions in real time, often called CART), or the automatic live-caption features built into platforms like YouTube Live, Zoom, and others. Automatic live captions are less accurate, so for important events a human captioner is safer.

Does this apply if I don't do live video?+

No. If your store has no live streamed audio content, this criterion does not apply to you. It only matters once you run live video with sound.

Reference

This is a plain-language explainer. The authoritative source is the W3C Web Content Accessibility Guidelines (WCAG) 2.2.

WCAG 2.2 © W3C. Excerpts are paraphrased; see the linked documents for the normative text.

Not sure if your store passes 1.2.4?

A human auditor checks this and every other criterion against your live store, and documents the result.

Book an audit