J.K. Rowling launched Pottermore in 2011 as an online reading and fan platform connected with the Harry Potter books. The site offered digital editions, interactive experiences, and new writing by Rowling about the wizarding world.
Pottermore was developed with Sony and was designed to accompany the books rather than replace them. Users could move through illustrated moments from the stories, be sorted into Hogwarts houses, receive wand information, and explore additional background material. Rowling also used the platform to publish details that were not included in the original novels.
The service was initially announced in June 2011 and opened more broadly after a staged period involving selected early users. It later became a major official source for Harry Potter-related information, including material about characters, magical history, and wizarding institutions.
In 2019, Pottermore was replaced as the main website by WizardingWorld.com, now associated with the broader Wizarding World brand. That change causes a common mix-up: Pottermore was the original platform, while Wizarding World is the later successor and wider franchise identity.