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About this site

Harry Potter: Books vs Series is an unofficial guide to HBO’s Harry Potter series. Its main purpose is to record every difference between J.K. Rowling’s books and the series, season by season.

Where the information comes from

Everything about the series comes from official sources: HBO and HBO Max, Warner Bros. Discovery, HarryPotter.com, the official trailers and images, and interviews given by the cast and the creative team. Each fact links to its source. The guides to the trailers also credit details that the press has noticed in the official videos.

Rumours, leaks and unconfirmed reports are not published. When something has not been announced, such as episode titles or the weekly schedule, the site says so.

How differences are checked

Every difference quotes or cites the book it departs from, with the chapter. When the books say nothing on a point and J.K. Rowling has answered it herself, as with the colour of Ron’s eyes, her own words are quoted with a link to the interview. Book references are to the UK editions published by Bloomsbury: PS is Harry Potter and the Philosopher’s Stone and CoS is Harry Potter and the Chamber of Secrets. Each quotation is checked word for word against the text before it is published.

A difference is recorded only when it can be seen in official material from the series. Until the episodes air, that means trailers, official images and statements from HBO and the production. From 25 December 2026, each episode will be added as it airs.

Updates

The site is updated whenever HBO releases new material. Every change is listed on the news page, which is also available as an RSS feed. Each page shows the date it was last updated at the bottom.

Not affiliated

This is a fan site. It is not affiliated with or endorsed by HBO, Warner Bros. Discovery, J.K. Rowling or her publishers. Images and videos belong to HBO and Warner Bros. Discovery and are used to illustrate the comparison, with a credit and a link to the original source.