Chicago Style uses title case, while Wikipedia Style uses sentence case. They are the standards for book publishing and encyclopedia writing respectively.
Chicago Style capitalizes all major words and long prepositions while lowercasing short prepositions of four letters or fewer, articles, and coordinating conjunctions. It is the dominant style for American book publishing.
Chicago Style is required for most manuscripts submitted to book publishers, literary journals, and academic presses. Scholars in the humanities default to it.
Open Chicago Style converterWikipedia Style uses sentence case for all article titles and section headings, capitalizing only the first word and any proper nouns. It is the editorial standard of the Wikimedia Foundation.
Wikipedia Style applies to all Wikipedia articles and other Wikimedia projects. It is also adopted by technical documentation projects and wikis that want a neutral, readable tone.
Open Wikipedia Style converterChicago Style is required for most manuscripts submitted to book publishers, literary journals, and academic presses. Scholars in the humanities default to it.
Prepositions of five or more letters are capitalized. Short prepositions like in, on, at, by, and of remain lowercase.
Wikipedia Style applies to all Wikipedia articles and other Wikimedia projects. It is also adopted by technical documentation projects and wikis that want a neutral, readable tone.
Only the first word and proper nouns receive capital letters. Common nouns that would be capitalized in title case remain lowercase.
Choose Chicago Style for books, academic papers, and literary publications.
Choose Wikipedia Style for Wikipedia articles, wikis, and reference documentation.
The two represent different editorial philosophies. Chicago Style marks text as a formal publication title, while Wikipedia Style treats headings as part of flowing prose.