A "legal chat" service to allow people to consult a lawyer online for free is set to go live on the South Australian Legal Services Commission's website.

The service, believed to be the first of its kind in Australia, will be available from Tuesday.

Last financial year, more than 80,000 calls were made to the commission's legal advice hotline.

The commission's Chris Boundy said the "chat-window", where people could type back and forth, was a direct response to growing public demand for legal assistance.

He said it would allow people to access free legal advice discreetly and without waiting on the phone.

"If they have a neighbourhood dispute or a fencing dispute, they can get on the legal chat line and quickly obtain information and links to downloadable information through our website without having to wait to speak to someone on a telephone advice line," Mr Boundy said.

He also said a trial showed that people under the age of 30 and workers in open-plan offices were more likely to gain legal advice if it was accessible online.

"Rather than talking on an open telephone line about something that may be troubling them, find it much more accessible and discreet to get on a legal chat and talk away in a dialogue sense through their computer and find out legal information that will assist them."

The service will be available during business hours Monday to Friday.