WCAG 1.2.1 Audio-only and Video-only: Understanding the Accessibility Requirements

What WCAG 1.2.1 requires

WCAG 1.2.1 is the Web Content Accessibility Guidelines success criterion titled “Audio-only and Video-only (Prerecorded)”. It is a Level A requirement in WCAG 2.0 and later versions. The rule says: for prerecorded audio-only or prerecorded video-only media, provide an alternative that presents the same information.

When this applies

This criterion applies only to prerecorded media. It does not cover live streams. Use it when a resource contains either:

• audio-only media, such as a podcast episode with no visual track
• video-only media, such as an animation or slideshow with visuals but no spoken audio

What to provide: clear options

Meet WCAG 1.2.1 by giving one of the following, depending on the media type.

For audio-only (prerecorded)

• Provide a full text transcript that conveys the content and meaning. The transcript must present the same information as the audio.
• If the audio conveys non-verbal information such as music that carries meaning, add a short textual description of that information.

For video-only (prerecorded)

• Provide an audio track that conveys the visual information. This can be a synchronized narration or descriptive audio track.
• Or provide a text alternative that describes the visual content in full.

Practical formats and placement

Make alternatives easy to find and use. Place transcripts, audio description files or text descriptions on the same page as the media or a clearly labelled related page. Prefer simple text or accessible HTML. If you use PDF, confirm the PDF itself is accessible.

Step-by-step decision flow

1. Is the media prerecorded? If no, this criterion does not apply.
2. Is it audio-only or video-only? Choose the matching branch.
3. Audio-only: write a complete transcript. Include descriptions of meaningful non-speech sounds.
4. Video-only: add an audio description track or publish a full text description of what is shown.
5. Make the alternative available alongside the media and label it clearly, for example “Transcript” or “Audio description”.

Examples and real-world cases

• Podcast episode with interview: publish a transcript of the spoken content and label it on the episode page.
• Music-only file that conveys lyrics or musical clues: provide a text description of lyrics or the intended meaning.
• Animation with no dialogue that shows a process: add an audio description track that explains the visuals or publish a detailed text description.

Testing checklist

• Can a user find and open the transcript or audio description from the media page within two clicks?
• Does the transcript present the same information as the audio, including key non-speech cues?
• If a text description replaces an audio description, does it cover the same content and order?
• Are files accessible: plain text or accessible HTML preferred, and PDFs checked for accessibility?
• Has at least one person using a screen reader reviewed the transcript or audio description for parity?

Common mistakes to avoid

• Posting only auto-generated captions or auto transcripts without human review. Errors can remove meaning.
• Hiding the transcript in a hard-to-find location or in an inaccessible file format.
• Assuming descriptive metadata is enough. Metadata does not replace a human-readable transcript or description.
• Confusing video captions with an audio description. Captions transcribe audio. Audio description explains visuals.

How this relates to other WCAG criteria

WCAG 1.2.1 covers prerecorded audio-only and video-only alternatives. Other nearby criteria address different needs:

• Captions and transcripts for media with both audio and video are covered elsewhere in the 1.2 series.
• Audio description and extended audio description criteria cover described video for users who cannot see visuals.
• Remember to consult the full WCAG documentation for how these criteria fit together when you publish mixed media.

Quick implementation notes for content teams

• Assign responsibility for transcripts when scheduling media. Plan time for human review.
• Store transcripts alongside the media file in the CMS and expose them with a clear label.
• For videos that start life as video-only but later gain a soundtrack, update the alternative accordingly.

Meeting WCAG 1.2.1 is usually straightforward. Provide a truthful, usable alternative and make it easy to find. That gives people who cannot hear or see the media access to the same information.