People who are Deaf or who have limited hearing often rely on captions and transcripts to perceive dialogue, understand background sounds, and otherwise experience the audio track of digital media. People who are blind or have low vision may require audio description to understand what is happening onscreen. Captions, transcripts, and audio description also provide information for people in loud or distracting environments, English language learners, people with low literacy, and others.

Recorded lectures, educational videos, podcasts, training content, videos on social media channels, and other online media should include appropriate captions, transcripts, and audio description to ensure access for all.

General guidelines for online media

Third-party captioning services

ACS Captions

Alternative Communication Services ( provides real-time, human-generated CART captions for Zoom and other web conferencing platforms. offers post-production captioning services for online digital video. Captions are available in multiple formats, and are appropriate for video platforms including YouTube, Vimeo, Panopto, Canvas, and HTML5 Web Video. 

Units should contact the vendors directly to make payment arrangements.

If you need assistance or support to work with a captioning vendor, contact the IT Accessibility team for a referral.

Captioning and Transcription Articles

Zoom: Enable Live Transcripts and Captions

Providing real-time captions and transcripts is simple way to make any Zoom session more accessible. Zoom hosts should enable Live Transcript at the beginning of every Zoom meeting.

Captioning Live Events