The Chicago Manual of Style Online is the digital edition of the long-established guide to style, usage, and grammar published by the University of Chicago. It provides accessible, authoritative advice for writers, editors, proofreaders, indexers, copywriters, designers, and publishers, helping users make informed decisions about editorial practice. The site features the 18th edition, alongside resources connected to the 17th edition, and offers a contents section, index, and citation quick guide.

Visitors can also explore Chicago Style Q&A, the Shop Talk blog, a user forum, and video tutorials. Librarian, teacher, and student resources support a range of research and learning needs. The brand offers online subscriptions and a free trial, as well as the option to purchase through the CMOS Store.

With more than 1. 75 million copies sold, The Chicago Manual of Style is presented as a trusted reference for people working with written content. The online service combines the manual’s editorial guidance with practical tools and resources for users seeking clear answers about style and usage