Getting Started With Third-Party (CART) Captioning in Zoom


Communication Access Realtime Transcription (CART) involves human transcription in real time while someone is speaking or a video is playing. Most deaf and hard-of-hearing individuals require the level of accuracy that CART provides.

Zoom supports professional CART providers through the built-in “Live Transcript” feature, allowing an assigned meeting participant to share captions through the platform. When this feature is enabled for a meeting/webinar, captions can be typed directly into Zoom or added to Zoom via an integration with a third-party software or service.

We recommend that you invite the third party to join the meeting/webinar as a participant and promote them to co-host before assigning them to type the live transcription.

Purchasing CART Services

Purchasing CART or ASL services for your unit from a third-party provider is negotiated exclusively by those two parties, without any university intermediary. When enlisting a CART Provider:

Important: Do not use live (auto-generated) transcription simultaneously with CART transcription. This will prevent the CART captioner from being able to type captions. Only one may be used at a time.

Instructions for the Host

  1. Start/join your Zoom meeting or webinar.
  2. Click Live Transcript from the Zoom toolbar along the bottom of the screen.
  3. Click Assign a participant to type.

Live Transcription menu in a host's Zoom meeting, red box around Assign a participant to type button in menu

  1. Hover over the participant who will be assigned to type the live transcript and click More from the participant window. 
  2. Click Make Co-Host from the drop-down menu, then click Yes to confirm. 
  3. Hover over the same individual's name and click More
  4. Click Assign to type Closed Caption from the drop-down menu. A pop-up window will then appear on that individual's screen: "The host has assigned you to type Closed Caption."

Participants list in Zoom meeting, More drop-down menu with red box around Assign to type Closed Caption option

Instructions for the Third-Party Captioner

Once the host assigns you the ability to type closed captions, a notification will appear on your screen: "The host has assigned you to type Closed Caption." To enter closed captions as a participant:

  1. Click Closed Caption in the pop-up window that appears.
  2. This will open up the closed caption box. Type the closed captions in the box.
  3. Click Enter to submit your closed captions.


  • There will be a delay of 6 to 10 seconds when viewing live captions.
  • Third-party captioners use two devices to provide captions.
  • When a third party joins the meeting, they should mute speakers on one of their devices.
  • Refer to Managing closed captioning and live transcription in Zoom Support for additional information.

If CART transcription isn’t a good fit, refer to Videoconferencing Captioning Tools for Zoom for more information on the other transcription tools in Zoom to determine which works best for your specific situation.

Last Updated: 
Thursday, November 10, 2022