Overview
Start here for Line 21 documentation: quick links, highlights and the best paths through setting up projects, captioning methods, destinations and AI services.
Essentials
The core concepts you’ll use in almost every setup: how captions are created, how languages work, and how you deliver them to viewers.
Getting started
Create an account, set up your organisation, and learn the basics.
Captioning methods
Human, ASR, and playback — when to use each and what to expect.
Languages
How language channels work (and how to add translations).
Destinations
Where captions go: browser, overlay, streaming, and text destinations.
Advanced
Deep dives for production workflows, integrations, and teams that want more control.
AV feeds
Understand audio/video inputs and how they affect caption quality.
AI services
Add translations, proofreading, and other assistive capabilities.
Project management
Monitor live events, coordinate with the team, and review assets after.
API
Programmatic integrations for caption production and retrieval.
Line 21 app
Operational how‑tos for running a live event in the web app.
Security & data
Data retention, AI training, third-party processors, and client options.
FAQs
Quick answers to the questions we hear most often.
For any questions, feedback, or support, please contact us here.