Title Case Converter - AP, Chicago & APA Styles

The 3 Major Title Case Styles

The phrase “title case” hides a real disagreement: newspapers, book publishers, and universities do not capitalize titles the same way. AP style, used by journalism and press releases, capitalizes principal words and most words of four letters or more while keeping short articles, conjunctions, and prepositions lowercase. Chicago style, the default for books and general publishing, also capitalizes major words and lowercases minor ones, with its own treatment of long prepositions. APA style, common in academic writing, applies similar title-case rules to paper titles and headings.

The differences live in the small words: whether a four-letter preposition such as “with” or “from” is capitalized, how hyphenated compounds are handled, and what happens after a colon or an em dash. A title case converter with style selection exists precisely because one mechanical “capitalize everything” rule cannot satisfy all three guides at once—each style is a judgment about which words carry meaning.

Which style should you use? Follow the publication you are writing for. Journalists reach for AP; book and magazine editors work from Chicago or their house variant; students and researchers apply APA or whatever their department mandates. When in doubt, pick one style, apply it to every heading, and stay consistent—uniformity reads as professionalism even to readers who could not name the difference.

To see the differences in practice, take the title “The Girl on the Train at Midnight”. Start Case renders it “The Girl On The Train At Midnight”, with every word wearing a capital. A title case pass keeps “on”, “the”, and “at” lowercase, because they are function words carrying little meaning. AP and Chicago broadly agree on that result, and APA applies the same principle to its headings. Paste a few titles into the converter and switch between styles: the minor words change while the meaningful ones stay capitalized, and that contrast is the entire reason style selection exists.

Why “Capitalize Every Word” Is Wrong

The fastest way to spot an amateur headline is an uppercased “The” or “And” in the middle of a title. Capitalizing every word—sometimes called Start Case—lifts the filler words that editorial convention deliberately keeps low: “and”, “or”, “but”, “the”, “a”, “an”, “of”, “for”, “in”, “on”, “at”, “to”, “with”. In print and on the web those minor words stay lowercase so the eye can glide to the meaningful nouns and verbs.

Mechanical conversion is also dangerous around proper nouns, acronyms, and compounds. “iPhone” should stay “iPhone”, “COVID-19” keeps its capitals, and “state-of-the-art” follows its own hyphenation rules. Running Start Case text through a proper title case converter lowers the minor words while leaving everything else intact, but you still proofread the output, because no rule set knows every brand name.

This is also the practical difference between this page and a plain “capitalize the first letter” utility: instead of uppercasing every word, the title case converter applies the selected style guide and keeps the small words small, which is what editors mean when they ask for real title case.