The main difference is how they treat prepositions. AP Style lowercases all prepositions regardless of length, while standard title case leaves that decision open to the writer.
Title case capitalizes every significant word in a title, including nouns, verbs, adjectives, and adverbs. Short function words are lowercased unless they open or close the title.
Title case is the default format for book titles, film titles, and album names in American English. It signals that a phrase is a formal title rather than ordinary prose.
Open Title Case converterAP Style title case capitalizes all major words while lowercasing articles, coordinating conjunctions, and all prepositions regardless of length. It is the standard of the Associated Press Stylebook.
AP Style is required by most American newspapers, digital news outlets, and press releases. Public relations professionals follow it because journalists expect it.
Open AP Style converterTitle case is the default format for book titles, film titles, and album names in American English. It signals that a phrase is a formal title rather than ordinary prose.
Nouns, verbs, adjectives, and adverbs are always capitalized. Articles, coordinating conjunctions, and short prepositions are lowercased in the middle of a title.
AP Style is required by most American newspapers, digital news outlets, and press releases. Public relations professionals follow it because journalists expect it.
All prepositions are lowercased, whether short or long. This is the key rule that distinguishes AP Style from Chicago Style.
Choose title case when writing for a context without a specific style guide, such as personal blogs, book proposals, and general-purpose headings.
Choose AP Style when writing for journalism, press releases, or any publication that follows the Associated Press Stylebook.
Both styles look similar for short titles, but the difference becomes visible in titles containing long prepositions like through, between, or without, which AP Style lowercases and title case capitalizes.