How do I file for divorce for free?

Go to the self help center, and also file a Request for Fee Waiver.

In Georgia, you would need to file a Poverty Affidavit. You can find the forms on the Internet. It will be up to the Judge whether to waive the filing fee after reviewing your affidavit.

I assume you mean without any attorney's fees, for even if you file on your own, there is approximately $275 in court fees and service fees alone. It is possible to file on your own as many counties have a pro se (do-it-yourself) packet with forms AND helpful instructions. You should check with your county clerk of court. If not, usually a packet from any other county will be fine but still be sure to confirm with your county if any extra/different forms or steps, plus make sure to change the county on all the forms. You could can also consider having an attorney review your documents before filing and also to confirm if you have any other potential issues or claims regarding the separation or divorce such that the packet will NOT be able to help.