Guide
Video accessibility and captions
Captioning is where accessibility requirements and ordinary reach happen to point the same way. The people who need captions to follow a video at all are a minority; the people who benefit from them are most of your audience.
What the standard asks for
The Web Content Accessibility Guidelines are the reference almost every regulation points at. For video, the relevant success criteria are about captions and about alternatives to what is only shown visually.
| Captions for prerecorded media | Level A. Prerecorded video with audio needs captions. This is the baseline, not the aspiration. |
|---|---|
| Captions for live media | Level AA. Live audio content in synchronised media needs captions too. |
| Audio description or media alternative | Level A. Information carried only in the picture needs an alternative for viewers who cannot see it. |
| Audio description | Level AA. A fuller requirement for describing what is happening visually. |
Level A is the minimum conformance level and Level AA is what most public sector and procurement requirements actually specify, which is why captions on prerecorded video are close to non-negotiable in an organisational context.
Where the obligations come from
- In the United States, the Americans with Disabilities Act has been applied to websites and digital content, and Section 508 governs federal agencies and their suppliers.
- In the European Union, EN 301 549 is the accessibility standard used in public procurement, and it incorporates WCAG. The European Accessibility Act extends requirements to a range of private-sector services.
- Sector rules add more. Broadcast, education, and public services frequently carry their own captioning requirements independent of general web accessibility law.
- None of this is legal advice, and obligations depend on where you operate and what you publish. The practical takeaway is that captions on prerecorded video are the common denominator across all of it.
What makes a caption track actually useful
A file that technically exists but is unreadable satisfies nobody. The difference between a compliant caption track and a genuinely useful one comes down to a short list:
- Accurate wording. An auto-generated track with the wrong words in it is worse than useless, because a viewer relying on it has no way to know it is wrong.
- Readable timing. Text that flashes past faster than it can be read excludes exactly the people it was meant to include. See subtitle timing and reading speed.
- Speaker identification where the picture does not make it obvious.
- Sound that carries meaning, and only sound that carries meaning.
- Synchronisation with the speech. Captions that drift are actively confusing.
The audience is larger than the requirement
- People watching without sound, which is most social viewing and a large share of viewing in shared spaces.
- People watching in a second language, who read more comfortably than they listen.
- People in noisy environments, or with a speaker whose accent is unfamiliar to them.
- Search engines, which cannot hear a video but can read an uploaded subtitle file or a published transcript.
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Are captions legally required?
It depends on where you operate and what you publish. WCAG treats captions on prerecorded video as a Level A requirement, and regulations in the United States and the European Union reference WCAG directly. This is general information rather than legal advice.
Are automatic captions good enough for accessibility?
As a first pass, yes. As a finished product, only after review. A caption track with the wrong words in it fails the viewer who depends on it, because they have no way to tell it is wrong.
Do captions need to include sounds as well as speech?
A caption track for accessibility should include sound that carries meaning, such as a phone ringing or a door closing, along with speaker identification. Ambient noise that adds nothing does not need annotating.
Do captions help people who are not deaf?
Substantially. Viewers watching without sound, watching in a second language, or in a noisy environment all rely on them, and that is a much larger group than the accessibility requirement addresses.