WebAIM: Captions, Transcripts, and Audio Descriptions

Captions, Transcripts, and Audio Descriptions

Article Contents

  • Captions
  • Transcripts
  • Audio Descriptions
  • Captions

    Accessible multimedia (visual and auditory content that is synchronized) must include captions—text versions of speech and other important audio content—allowing it to be accessible to people who can’t hear all of the audio.

    According to US government figures, one person in eight has some functional hearing limitation, and this number will increase as the average age of the population increases. Beyond people with disabilities, captioning helps people who only partially understand the language presented. Captions are also useful in noisy environments like airports, in quiet environments like libraries, and for multimodal learning.

    All multimedia content with speech should have accessible captions that are:

    • Synchronized to appear at approximately the same time as the corresponding audio.
    • Equivalent to the spoken words and other audio information.
    • Accessible, or readily available, to those who need it.

    Captions as typically seen on television

    The most common type of captions are “Closed” captions, which can be turned on or off. Most countries require most pre-recorded and live television programs to be closed-captioned.

    Closed captioning of most pre-recorded television programs is now a legal requirement in most countries. Most live broadcasts (such as news [...]

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