Title Capitalizer
Capitalize titles correctly for APA, Chicago, AP, MLA, and 5 more style guides. Click "Explain" to see why each word changed. Press ⌘↵ to copy.
Word-by-word explanation
Browse by style guide
What Is a Title Capitalizer
A title capitalizer converts any raw title or heading into the correctly capitalized form required by your style guide. Rather than memorizing every rule for every style, you paste your title, select a standard, and get a formatted result instantly. TitleCasePro's title capitalization tool supports all nine major styles used in academic, journalistic, and professional writing.
Beyond simple conversion, the tool explains each decision. Click "Explain" after converting a title to see a word-by-word table showing exactly which rule was applied — whether a word was capitalized because it is a principal word, or lowercased because it is a short preposition or article under that style's rules. This makes the tool useful both for getting quick results and for learning why title capitalization works the way it does.
Title Capitalization Rules Vary by Style Guide
Each style guide has a distinct set of rules about which words to capitalize. APA treats every word of four letters or more as a major word, so "Between", "Through", and "Without" are all capitalized in the middle of a title; only articles and prepositions or conjunctions of three letters or fewer stay lowercase. AP uses the same lowercase set as APA, so the two always agree. Chicago takes a different approach: it lowercases prepositions of four or fewer letters, so "with" and "from" go down while "About" and "Between" are capitalized. MLA is the outlier — it lowercases prepositions of any length, giving "Writing about the World" where APA, AP, and Chicago all give "Writing About the World". AMA capitalizes every single word — articles, prepositions, and conjunctions included.
These differences matter. A manuscript submitted to a psychology journal should follow APA title case rules. A news headline should follow AP. A legal citation should follow Bluebook. Using the wrong style guide creates inconsistency that signals unfamiliarity with the publication's standards. Use the per-style capitalizers below or see the full rules in the style guide reference.
Word-Level Explanations for Every Title
After converting a title, click "Explain" to see a word-by-word breakdown. Each word is shown alongside the specific rule that determined its capitalization. For example: "of — short preposition, lowercase per APA." This makes TitleCasePro useful not only as a conversion tool but as a learning resource for understanding why title capitalization works the way it does.
Who Should Use a Title Capitalizer
Students writing APA-style research papers need to ensure every section heading follows APA title case — principal words capitalized, plus every word of four letters or more, with only articles and three-letter-or-shorter prepositions and conjunctions left lowercase. Journalists writing AP headlines need the same four-letter threshold applied consistently. Book editors working with Chicago style need its opposite cutoff — prepositions of four letters or fewer go down — applied correctly. Legal writers citing secondary sources under Bluebook need conservative title case applied uniformly.
Content teams managing hundreds of blog titles, product pages, and category headings benefit from applying a consistent style at scale using the batch capitalizer. Email marketers need sentence-case subject lines that feel natural rather than promotional. Developers converting variable names and identifiers between naming conventions can use the case converter for camelCase, PascalCase, snake_case, and more.
Compare Styles, Batch Convert, and More
If you are unsure which style to use, the comparison tool shows all nine results side by side for any title you enter. For bulk work, the batch capitalizer handles entire lists with CSV and TXT import and export. For text formatting beyond titles, the case converter handles 13 text case formats including camelCase, snake_case, and UPPERCASE.
Read the full rules for each style in the style guide reference, or jump directly to a per-style capitalizer below.
Link to TitleCasePro
If you find TitleCasePro useful, link to it from your blog, resource page, or writing guide. It helps your readers and supports the project.
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<a href="https://titlecasepro.com/title-capitalizer/" rel="noopener">Free Title Case Converter — TitleCasePro</a> Title Capitalizer FAQ
Common questions about using TitleCasePro to capitalize titles correctly.
A title capitalizer is a tool that converts any title or heading into the correctly capitalized form required by your style guide. Instead of memorizing each style's rules, you paste your title, select a standard, and get an accurate result instantly. TitleCasePro supports APA, Chicago, AP, MLA, Bluebook, AMA, NY Times, Wikipedia, and Email.
Paste or type your title into the input box, then select a style guide from the tab row. The capitalized title appears immediately in the output. Click "Explain" to see a word-by-word breakdown of every decision. Use the Copy button or press ⌘↵ to copy the result.
TitleCasePro supports nine styles: APA (7th Edition), Chicago (CMOS 17), AP Stylebook, MLA (9th Edition), Bluebook (21st Edition), AMA (11th Edition), NY Times, Wikipedia, and Email. Each follows its official rules for which words to capitalize.
In most title case styles, capitalize the first and last word, all nouns, pronouns, verbs, adjectives, and adverbs. Do not capitalize articles (a, an, the), coordinating conjunctions (and, but, or, nor, for, so, yet), or short prepositions (in, on, at, of, to, by) in the middle of a title. Rules vary slightly across style guides.
Articles (a, an, the), coordinating conjunctions (and, but, or, nor, for, so, yet), and short prepositions (at, by, for, in, of, on, to, up, via) are lowercase in the middle of a title across most style guides. The first and last word of any title are always capitalized regardless of their part of speech.
Yes — in all major title case styles (APA, Chicago, AP, MLA, Bluebook, AMA, NY Times), the first and last word of a title are always capitalized, regardless of their part of speech. Even "a," "an," "the," or a short preposition is capitalized if it is the first or last word.
"The" is capitalized when it is the first word of a title — "The Great Gatsby." In the middle of a title, "the" is an article and stays lowercase — "Lord of the Rings." All major style guides follow this rule. Only AMA capitalizes "the" anywhere in a title, since AMA capitalizes every word.
"To" is lowercase in most title case styles. As a two-letter preposition, it falls below every style guide's capitalization threshold. In Chicago, "to" as an infinitive marker is also explicitly lowercase. Example: "How to Write a Great Title" — "to" stays lowercase in APA, Chicago, MLA, AP, and NY Times.
"And" is a coordinating conjunction and stays lowercase in the middle of a title under all major style guides — APA, Chicago, AP, MLA, Bluebook, and NY Times. It is only capitalized when it appears as the first or last word of a title. Example: "Truth, Justice, and the American Way" — "and" is lowercase.
Yes. "Your" is a possessive pronoun and is capitalized in title case under every major style guide — APA, Chicago, AP, MLA, AMA, NY Times, and Bluebook. Example: "Finding Your Voice as a Writer" — "Your" and "Voice" and "Writer" are all capitalized.
Yes. TitleCasePro is a full title case converter. It supports 9 style guides, explains every word-level decision, compares all styles side by side, and converts large lists via the batch capitalizer. It works entirely in the browser — no signup, no installation.
Yes. TitleCasePro is widely used for blog posts and online articles. Most content teams and SEO writers use AP or Chicago style. Select the style your publication follows, paste your titles, and copy the results. The batch tool handles large publishing queues at once.
Yes. For academic essays, use APA (social sciences) or MLA (humanities). For book titles in general publishing, Chicago is the standard. Paste your title, select the appropriate style, and copy the correctly capitalized result. The style guide pages explain each standard in detail.
Yes. TitleCasePro includes an Email mode that applies sentence case to your subject line — the modern standard for professional and marketing emails. Only the first word and proper nouns are capitalized, which feels more natural and personal than full title case.
Yes. Click "Explain" after a conversion to see a word-by-word table showing the rule applied to every word. You will see exactly why "the" stayed lowercase, why "Between" was capitalized, and why "NASA" was left unchanged — making the tool useful for learning, not just converting.
Yes. Use the Compare Styles tool to see your title formatted in all 9 style guides at once — APA, Chicago, AP, MLA, Bluebook, AMA, NY Times, Wikipedia, and Email — in a single side-by-side table.