Pathfinder Modules are 64-page, quarterly adventure publications. Each volume contains a full, stand-alone adventure which can be run as a self-contained mini campaign or as part of a larger ongoing series of adventures. In addition to the adventure content, each volume contains new monsters, magic items, and regional background information to aid Game Masters in bringing the setting of the adventure to life.
Of the four annual 64-page Pathfinder Modules, one is a fan-chosen adventure, selected as part of the yearly RPG Superstar game design talent search conducted by Paizo. In addition to these quarterly offerings, Paizo also traditionally releases a 16-page adventure within the Pathfinder Modules line as part of the international gaming promotion, Free RPG Day. Such adventures are usually designed to serve as introductions to the Pathfinder RPG and the Pathfinder campaign setting, and often tie in thematically to other releases from Paizo around the same time.
Pathfinder Modules began as monthly, 32-page adventures and later shifted to a bi-monthly release schedule. With the shift in module length to accommodate longer adventures, the release schedule was extended to quarterly. This has been the standard release schedule of the line since June 2013.