The Chicago Manual of Style Online is the digital home of The Chicago Manual of Style, a long-established reference for writing, editing, and publishing. Presented by the University of Chicago, it offers guidance on style, usage, and grammar in an accessible online format. The resource serves writers, editors, proofreaders, indexers, copywriters, designers, and publishers, providing authoritative advice for a wide range of editorial work.

Visitors can explore the manual’s contents and use a citation quick guide, as well as access Chicago Style Q&A, a blog, and a user forum. The site also provides video tutorials and resources for librarians, teachers, and students. Subscription and free-trial options are listed alongside account management and store links. The online edition includes material from the 18th edition, whose text is dated 2024, and the 17th edition, dated 2017. With more than 1.75 million copies sold, The Chicago Manual of Style is positioned as a trusted guide for people seeking clear, consistent standards in written communication.