What Is AP Style Title Capitalization? | TitleCasePro

AP style title capitalization is defined by the Associated Press Stylebook and is the standard for US newspapers, wire services, broadcast journalism, and most digital news organizations.

The defining rule: Capitalize any word that is four or more letters long — regardless of whether it is a preposition, conjunction, or article.

This simplicity is intentional. Journalists working on deadlines need capitalization rules they can apply instantly without consulting a reference book. The four-letter threshold eliminates most judgment calls.

The AP Capitalization Rule

Word length	Treatment	Examples
3 letters or fewer	Lowercase	a, an, the, and, but, for, nor, or, so, yet, at, by, in, of, on, to, up
4 letters or more	Capitalize	From, Into, Like, Near, Once, Over, Past, Plus, Than, That, Till, Unto, Upon, With

⚠️ Key insight: Unlike APA and MLA, which lowercase all prepositions, AP capitalizes prepositions of 4+ letters. From, Into, With, Over, Like are all capitalized in AP style.

AP Style Examples

Short title — most words capitalized: How to Write Better Headlines for the Web

• How (3) → lowercase? No — How is the first word, always capitalize
• to (2) → lowercase
• Write (5) → capitalize
• Better (6) → capitalize
• Headlines (9) → capitalize
• for (3) → lowercase
• the (3) → lowercase
• Web (3) → capitalize (proper noun)

Title with 4-letter prepositions: A Study of the Role of Social Media in Modern Journalism

• Role (4) → capitalize (4 letters = AP threshold)
• of (2) → lowercase
• the (3) → lowercase
• Social, Media, Modern, Journalism → capitalize

AP vs. Chicago vs. APA

Word	Letters	AP	Chicago	APA
of	2	lowercase	lowercase	lowercase
the	3	lowercase	lowercase	lowercase
from	4	Capitalize	lowercase	lowercase
with	4	Capitalize	lowercase	lowercase
over	4	Capitalize	lowercase	lowercase
into	4	Capitalize	lowercase	lowercase
about	5	Capitalize	Capitalize	lowercase
between	7	Capitalize	Capitalize	lowercase

AP capitalizes more words than Chicago because its threshold (≥ 4 letters) catches with, from, into, over — which Chicago still lowercases. APA lowercases everything on the second half of that table.

Headlines vs. Formal Titles in AP Style

Note: The AP Stylebook distinguishes between headlines and formal title mentions in copy.

Headlines in AP news publications often use sentence case — only the first word and proper nouns are capitalized. This is increasingly the standard for digital news sites because it reads as more conversational.

Formal title mentions in text (book titles, album names, film titles) use AP title case with the 4+ letter rule.

If you’re working in digital journalism, check your publication’s specific style guide — many organizations have adopted a hybrid approach.

Where AP Style Is Used

• Newspapers and wire services (Associated Press, Reuters, AFP)
• Broadcast journalism (TV and radio news copy)
• Digital news organizations (NPR, Politico, many regional newspapers)
• Public relations and press releases
• Corporate communications teams following media conventions

Use the AP title capitalizer to apply the 4-letter rule automatically to any title, with a word-by-word breakdown showing which words hit the threshold and which fall below it.