A complete guide for all your available captions output options for viewers.

<aside> 📌 Destinations are ways of displaying the captions. Line 21 supports a wide range of destinations, each with their own particular configuration.

A single project can make use of all the possible destinations (e.g. send captions to both YouTube and Facebook and any other destination) and even more instances of a single destination (e.g. send captions to 2 youtube destinations).


<aside> 💡 If you can’t find what you’re looking for, and want another integration added, contact us.


🌐 Browser Link

Compatible with all modern browsers.

View Captions Click ‘Open caption link’ to view writer output - this will open a new browser page automatically for you.

For Viewers: Click ’Copy caption link’ from your project dashboard.

Send the URL to your viewer(s).


<aside> <img src="https://s3-us-west-2.amazonaws.com/secure.notion-static.com/ba0d951e-ba55-4887-a532-67d299297885/185037_browser_window_icon.png" alt="https://s3-us-west-2.amazonaws.com/secure.notion-static.com/ba0d951e-ba55-4887-a532-67d299297885/185037_browser_window_icon.png" width="40px" /> Example URL: https://line-21.com/captions/64d3b9e5a03b7ec8de55e337/monitor?token=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJwZXJtaXNzaW9ucyI6WyJjYXB0aW9uczo2NGQzYjllNWEwM2I3ZWM4ZGU1NWUzMzc6KiIsInByb2plY3Q6NjRkM2I5ZTVhMDNiN2VjOGRlNTVlMzM3OnJlYWQiXX0.OfqFdbx0az7POob3RLXU7teITa32J5Qa-ZiOxOPJSm8


📁 Subtitle Overlay

Compatible with all major operating systems.

Copy and send the relevant download link to your viewer(s) to install Line21.

Send them the unique overlay key for their session from project dashboard.

Download links for your device:

Apple MacOS - v2.4

Windows - v2.4

Linux (debian/ubuntu)

Linux (AppImage)

<aside> <img src="https://s3-us-west-2.amazonaws.com/secure.notion-static.com/690bc31e-88d1-4e44-9fbf-b591aca1ddbf/9044785_overlay_icon.png" alt="https://s3-us-west-2.amazonaws.com/secure.notion-static.com/690bc31e-88d1-4e44-9fbf-b591aca1ddbf/9044785_overlay_icon.png" width="40px" /> Example Overlay Key: eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJwcm9qZWN0SWQiOiI2NGEyOTg5OWMxOTdmYWU4NmM1MzJmZWUiLCJwZXJtaXNzaW9ucyI6WyJjYXB0aW9uczo2NGEyOTg5OWMxOTdmYWU4NmM1MzJmZWU6KiIsInByb2plY3Q6NjRhMjk4OTljMTk3ZmFlODZjNTMyZmVlOnJlYWQiXX0.zZGaYzYAwfgueAhNdzSGa5KG8Pmlh8ZczgtnlPj8slY


ℹ️ iFrame / Embed (coming soon)

If you have a need for iFrame plugins, please contact us.

↔️ API Integration

Line21 currently integrates with the below platforms.

Click the links for our full guides on how to set up a meeting in your platform and retrieve the information you need for seamless integration.