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Answers to frequently asked questions about Line 21's live captioning services, team and workflows, kept up to date as new questions come in from users.

Welcome to our FAQs — your go-to resource for quick answers to common questions about our services, team, and workflows.

This is a living document that is updated frequently - if you have a question and can't see it here, please email hello@line-21.com and we'll add it to our knowledge base!

General FAQs

CART Captioning FAQs

Security & data

Data handling & retention

How Line 21 handles data retention, AI model training and third-party processors in its live captioning, translation and AI dubbing pipeline, vendor by vendor.

FAQs

General FAQs

What options do I have for captions display?

Can viewers customise their captions?

Is Line21 screen reader friendly?

What is the difference between closed and open captions?

Do you support onsite, offline captioning?

Do you provide professional captioners?

CART Captioning FAQs

How do I connect to Line 21?

How do I start and stop my session?

How can I work with a co-worker?

Is my writer page what the viewer sees?

How do I send a new line of text?

Does Line 21 support respeaking?

Security & data

Is client content used to train third-party AI models?

Can specific vendors be excluded from our pipeline?

Is EU data residency available?

Is Zero Data Retention (ZDR) available?

Are HLS recordings retained?

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