Video AccessibilityCaptions are only the start

Accessibility is a quality standard, not a favour#

Many brands treat accessibility as a compliance task to be added at the end. That is backwards. A video that cannot be understood without sound, or that relies on visuals a screen-reader user cannot perceive, simply works for fewer people. Fixing it late is more expensive than designing it in.

The benefits also extend far beyond people with disabilities. Captions help anyone watching on mute in a feed, commuting, in an open office, or in a second language. Transcripts help search engines and answer engines understand what a video says. Readable text helps everyone on a small screen. Accessibility is simply good video practice.

The standard most organisations use#

The Web Content Accessibility Guidelines (WCAG), published by the W3C, are the reference most organisations and many laws point to. For pre-recorded video, WCAG requires captions at Level A, and audio description at Level AA. Live captions are required at Level AA. WCAG also sets a limit on flashing content: nothing should flash more than three times in any one second, unless it falls below defined thresholds. Laws in many jurisdictions, including disability rights legislation in India and accessibility laws in the EU and US, reference or align with these guidelines; check which apply to you.

Captions done properly#

Automatic captions are a starting point. They regularly misread brand names, technical terms, accents and overlapping speech, and they rarely describe non-speech sounds. Always review and correct them. For important videos, consider professional captioning.

• Accurate: every word, including names and jargon, spelled correctly.
• Synchronised: appear and disappear in time with speech.
• Complete: include meaningful sounds such as [door slams] or [upbeat music], and speaker identification where unclear.
• Readable: short lines, typically no more than two at a time; many caption style guides recommend limits on characters per line and reading speed.
• Well placed: not covering faces, key visuals or on-screen text; moved where needed.

Open or closed captions?

Closed captions are a separate file that viewers can switch on or off, and that platforms and search engines can read. Open (burned-in) captions are part of the picture and always visible, which suits social feeds where many people watch muted. Often the right answer is both: burned-in captions for social versions, and closed caption files for YouTube, your website and other players that support them.

Audio description and described video#

Audio description narrates important visual information that is not conveyed by the soundtrack, for viewers who are blind or have low vision. If your video shows a price, a chart, a product feature or a step in a process without saying it, a blind viewer misses it.

The cheapest way to meet this need is to write it into the script: have the narration describe what matters on screen. This ‘integrated description’ avoids a separate track and often improves the video for everyone. Where that is not possible, produce an audio-described version or provide a descriptive transcript. Plan this in video scriptwriting.

Building accessibility into production#

On-screen text, colour and motion#

• Use large, clear type with strong contrast against the background; add a backing panel over busy footage.
• Hold every line long enough to read comfortably, ideally twice.
• Do not convey meaning only through colour, such as ‘the green option’; add labels or shapes.
• Avoid rapid flashing and strobing; check effects, transitions and footage of lights or screens.
• Keep important motion purposeful; excessive movement can disorient some viewers. See motion graphics.

Clarity, language and cognitive load#

Accessibility is not only about sight and hearing. Viewers with cognitive or learning disabilities, viewers watching in a second language and viewers who are simply tired all benefit from the same things: plain language, one idea at a time, a clear structure and a steady pace. These are also the qualities of good marketing video, which is the point.

• Use short sentences and common words in narration and on-screen text.
• Signal structure: tell viewers what is coming, use chapters for longer videos, recap key points.
• Avoid cramming text and narration together; give the eye and ear one job at a time.
• Offer subtitles in the main languages of your audience, translated and reviewed by fluent speakers.
• Let viewers control pace: pause, rewind and adjustable playback speed in the player.

In multilingual markets, captions in the spoken language and subtitles in other languages are different deliverables. Plan both in the brief, budget for human review of each, and remember that on-screen text inside the picture also needs translating for language versions.

Live video and accessibility#

Live streams and webinars are harder to make accessible because there is no edit. Plan for live captioning, whether by a human captioner or an automatic service, and test it with your platform before the event. Ask presenters to describe what they show on screen, read out questions from the chat before answering them, and avoid relying on visuals alone. After the event, replace live captions on the recording with corrected ones before publishing it more widely.

Players and pages#

Where you host video on your own site, the player matters. Controls should be operable by keyboard and labelled for screen readers. Video should not autoplay with sound, and any autoplaying content needs a way to pause it. Place a transcript on the page beneath the video. Our guide to web accessibility covers the wider page.

Published by Fabulous.Media, a network of specialist marketing agencies. Updated 9 October 2026. Platform features change often; check current official documentation before acting on platform-specific detail.