Chicago Title Capitalization
CMOS 17 capitalises all major words. Short prepositions (≤4 chars) are lowercase, but longer ones like "About" and "Between" are capitalised.
Word-by-word explanation
Chicago capitalization rules
- Capitalise all major words
- Lowercase: articles (a, an, the)
- Lowercase: coordinating conjunctions (FANBOYS)
- Lowercase: prepositions ≤4 letters (at, by, for, in, of, on, to)
- Capitalise: prepositions ≥5 letters (About, Above, Between…)
- Always capitalise first and last word
- Capitalise both parts of a hyphenated compound
Read the full Chicago title capitalization rules with examples.
When to Use Chicago Title Capitalization
Chicago title case is the standard for Books, Publishing, History, Arts & Humanities writing. CMOS 17 capitalises all major words. Short prepositions (≤4 chars) are lowercase, but longer ones like "About" and "Between" are capitalised. When your work will be reviewed, published, or cited within these fields, using the correct capitalization style shows attention to detail and compliance with professional standards.
Chicago Title Case vs Other Styles
Title capitalization is not universal. The same title formatted in Chicago style will look different from APA, Chicago, MLA, or AP — and each difference is intentional. Use the style comparison tool to enter your title and see all nine styles side by side. If you need to convert a large list of titles, the batch capitalizer handles CSV and TXT imports for bulk workflows.
Deep-dive: Chicago style title case rules explained.
How the Chicago Capitalizer Works
Paste your title into the tool above. Select Chicago as the active style and the result appears immediately. Click "Explain" to see the rule applied to each word. Use the copy button or press ⌘↵ to copy the output. Everything runs in the browser — no account, no signup, no data sent to a server.
About Chicago Title Case
Chicago title case is defined by the Chicago Manual of Style, 17th edition (2017), and is the standard for book publishing, academic monographs, history writing, and general non-fiction. Chicago uses a preposition-length rule: prepositions of four letters or fewer (at, by, for, in, of, on, to, up, with, from, into, over) stay lowercase, while prepositions of five or more letters (About, Above, Across, After, Among, Between, Beyond, During, Through, Without) are capitalized. This makes Chicago distinctly different from APA and MLA, which lowercase all prepositions. A title like "A Study About the World" capitalizes "About" in Chicago but not in APA.
Chicago Title Case Examples
These examples are generated in real time by the same engine that powers the tool above — every result is guaranteed to match the tool's output.
| Original (lowercase) | Chicago Style |
|---|---|
| the quick brown fox jumps over the lazy dog | The Quick Brown Fox Jumps over the Lazy Dog |
| a guide to writing about the world | A Guide to Writing About the World |
| why sleep is important for students | Why Sleep Is Important for Students |
| learning through failure and success | Learning Through Failure and Success |
| notes on the art of writing without fear | Notes on the Art of Writing Without Fear |
| how to capitalize titles in academic writing | How to Capitalize Titles in Academic Writing |
| the effects of social media on mental health | The Effects of Social Media on Mental Health |
| introduction to machine learning with python | Introduction to Machine Learning with Python |
Common Chicago Edge Cases
- "With" has exactly 4 letters — it stays lowercase in Chicago even though it looks substantial.
- "Into" (4 letters) stays lowercase. "Until" (5 letters) gets capitalized.
- Coordinating conjunctions "so" and "yet" — Chicago capitalizes these when they function as adverbs, not conjunctions.
- First and last word are always capitalized, even if they are short prepositions like "of" or "in."
- The first word after a colon is always capitalized. The second part of a subtitle starts with a capital.
Chicago vs Bluebook
Chicago and Bluebook produce nearly identical title case because Bluebook's rules closely follow Chicago's preposition-length threshold. Both capitalize prepositions of five or more letters and lowercase shorter ones. The main practical differences appear in citation formatting rather than in title case itself. Bluebook adds legal-specific rules for case names, statutes, and abbreviations, while Chicago is the broader publishing standard. For general title capitalization of headings and article titles, the two styles are interchangeable.
Chicago capitalization FAQ
Common questions about using TitleCasePro for Chicago title case.
The Chicago title capitalizer converts any title into correct Chicago Manual of Style (CMOS 17) capitalization instantly. Select Chicago, paste your title, and see the result with an optional word-by-word explanation.
Chicago capitalizes the first and last word plus all major words — nouns, verbs, adjectives, adverbs, pronouns. Articles (a, an, the), coordinating conjunctions, and prepositions of four or fewer letters are lowercase. Longer prepositions like "About," "Between," and "Through" are capitalized.
Yes. TitleCasePro follows the Chicago Manual of Style, 17th Edition. Short prepositions (≤4 letters) like "at," "by," "for," "in," "of," "on," "to," "up" are lowercase. Prepositions of five or more letters are capitalized.
It capitalizes principal words — nouns, pronouns, verbs, adjectives, adverbs — and lowercases articles, coordinating conjunctions, and prepositions of four or fewer letters. The first and last words are always capitalized regardless of type.
Yes. Click "Explain" to see each word labeled with its rule — for example, "from — preposition ≤4 letters, lowercase per Chicago CMOS §8.157."
Yes. Click the Copy button or press ⌘↵ to copy the result to your clipboard.
Yes. The Compare Styles tool shows Chicago alongside APA, AP, MLA, and 5 other styles in one table.
Yes. Chicago is the standard for book chapters, journal articles, and headings in general publishing. Paste your title and copy the correctly formatted result.
Yes. History and humanities essays commonly follow Chicago. The capitalizer applies the correct CMOS rules to your essay title automatically.
Yes. Chicago is the standard for most book publishing. Paste your book or chapter title and the tool formats it to CMOS 17 rules.
Yes. Chicago title case applies to headings, chapter titles, and section titles in books and long-form documents. The tool handles all of these correctly.
Yes. Completely free with no account or usage limit required.
Yes. Runs entirely in your browser — no server, no storage, works on desktop and mobile.