Free-to-play users will have access to all eight of the game's character classes and be able to play up to level 50 in each of their storylines.
Some restrictions will apply to free-to-play users, including access to higher level content and new features as they are added to the game. They will be available as individual purchases, or users can gain unlimited access by paying for a monthly subscription.
A new currency, called Cartel Coins, will also be introduced. Cartel Coins can be purchased with real money and will be used to purchase certain content including customisable gear and convenience features.
For example, users will be able to purchase the new Kowakian Monkey Lizard Pet or a Sith Meditation Throne item with Cartel Coins.
Users who subscribe to the game will retroactively receive an allowance of Cartel Coins for each paid month prior to when the free-to-play option is introduced.
Subscribers will continue to receive "ongoing monthly grants" of Cartel Coins, though how much and for how long has not been specified.
Last month, the game received the '1.3 Allies' update. BioWare said that updates will become more frequent once the free-to-play option begins.
To prepare for the free-to-play option, Star Wars: The Old Republic will go on sale in August for $14.99 including a one-month subscription.
Star Wars: The Old Republic will introduce its free-to-play option this autumn.
> Read our review of Star Wars: The Old Republic
Watch the trailer for Star Wars: The Old Republic below: