Title Case Converter

The two major American style guides agree on the core rule — capitalise major words, lowercase short articles, conjunctions and prepositions — but differ on the details at the edges: Chicago style lowercases prepositions of any length, while AP style capitalises prepositions of four letters or more, so "with" stays lowercase under Chicago but capitalises under AP. Neither convention is objectively correct; they are simply different publications' house styles, and the gap between them only shows up on longer prepositions that most headlines do not use anyway.

This tool follows the more widely recognised convention across general publishing, which keeps output familiar to the broadest audience rather than matching one specific publication's house style exactly. For any title going into a context with its own explicit style guide, checking the specific rule for prepositions of exactly four or five letters is the one place the two conventions can diverge in practice.

Titles, headlines and navigation labels are the contexts where Title Case reads as correct and expected — a blog post title, a page heading, a menu item. Applying the same treatment to ordinary body text or a full sentence inside a paragraph looks distinctly odd to most readers, since Sentence case — capitalising only the first word — is the convention for continuous prose. The two exist for different purposes: Title Case marks something as a discrete label to be scanned, Sentence case marks something as prose to be read.