Title Capitalization Tool
Properly capitalize your titles following different style guides. Choose from AP, APA, Chicago, or other standard styles.
AP Style (Most Common): Capitalize first and last words, and all words with 4+ letters. Prepositions, articles, and conjunctions of three or fewer letters are lowercase unless they are the first or last word.
How to use Title Capitalization Tool
- 1
Enter your title
Type or paste a title into the input box, or add several titles with one per line.
- 2
Pick a style guide
Choose AP, APA, Chicago, or Capitalize All Words to match the convention you need.
- 3
Convert to title case
Click Convert to Title Case to apply the chosen rules to every title at once.
- 4
Copy the result
Review the capitalized output and copy it to your clipboard for use in headings or articles.
Title Case Demystified: AP, APA, and Chicago Rules
What real title case is
Title case is not simply capitalizing every word. Every major style guide agrees on one foundation: capitalize the first word, capitalize the last word, and capitalize all the major words in between, while keeping certain minor words lowercase. The major words are nouns, pronouns, verbs, adjectives, and adverbs. The minor words are articles, short coordinating conjunctions, and short prepositions.
That is why "the lord of the rings" becomes "The Lord of the Rings" rather than "The Lord Of The Rings." The first "The" is capitalized because it leads the title, but the interior "the" and the preposition "of" stay lowercase. If you want every word capitalized regardless, that is the separate Capitalize-Each-Word job, not title case.
AP style: the four-letter rule
Associated Press style, used by most newsrooms and blogs, leans on a simple length test. Capitalize the first and last words, and capitalize every word of four or more letters. Articles, conjunctions, and prepositions of three letters or fewer stay lowercase unless they fall first or last. This tool selects AP by default because it is the most common choice online.
The four-letter rule is easy to apply but produces a notable quirk: it capitalizes longer prepositions. "Between," "about," "through," and "with" all reach four letters, so AP capitalizes them. A headline like "a walk through the woods" becomes "A Walk Through the Woods," with "Through" up but the three-letter "the" down.
APA and Chicago: parts of speech, not length
APA and Chicago ignore length and look at grammar instead. Both capitalize the first and last words and all major words, and both keep articles, coordinating conjunctions, and prepositions lowercase. The classic Chicago refinement is that prepositions stay lowercase no matter how long they are, so "between" and "through" remain lowercase in the middle of a title.
Run "a walk through the woods" in Chicago or APA mode and you get "A Walk through the Woods," with "through" lowercase, which is exactly where AP and Chicago diverge. This is the single most useful difference to remember when you are deciding which style a title was written in.
The length-threshold debate
Why do guides disagree about prepositions at all? Short prepositions like "in," "on," and "of" read as connective glue, so every guide lowercases them. Longer prepositions like "between" and "underneath" look heavier on the page, and editors have argued for decades about whether weight should override grammar. AP answered with a blunt length cutoff; Chicago answered with a grammatical rule.
There is no universally correct answer, which is precisely why this tool offers multiple styles. The right choice is whichever guide your publication, instructor, or employer follows. If no one specifies, AP is the safe default for web and news writing, while academic and book publishing usually expect Chicago or APA.
A worked headline across styles
Take the raw headline "the rise and fall of a startup founder." In AP style it becomes "The Rise and Fall of a Startup Founder": "and" and "of" are short and lowercase, "a" is short and lowercase, while "Rise," "Fall," "Startup," and "Founder" are capitalized as major words, and "The" leads so it is up.
APA and Chicago produce the same result here because no long prepositions are involved. The divergence appears only when a four-plus-letter preposition or conjunction shows up, such as "versus," "about," or "between." Whenever you see one of those in a title, the chosen style actually changes the output.
Capitalize All Words: when title case is wrong
The fourth option, Capitalize All Words, deliberately breaks the style-guide rules and capitalizes every single word, including "and," "the," and "of." This is not real title case, but it is genuinely useful for contexts that expect uniform capitals: certain UI labels, legal headings, signage, slide titles, and houses styles that simply prefer everything capitalized.
Reach for this mode when consistency matters more than editorial convention. If you are publishing an article, a paper, or a book, avoid it and pick AP, APA, or Chicago instead, because over-capitalized headlines read as amateurish to anyone trained on a standard guide.
Batch processing and quick tips
You can paste one title per line and the tool applies your chosen style to each line independently, formatting a whole list of headlines, chapter names, or video titles in a single pass. That makes it practical for editorial calendars, tables of contents, and content audits where dozens of titles need the same treatment.
Two habits save you grief. First, decide the style before you paste, because switching guides can change capitalization on prepositions and conjunctions. Second, eyeball proper nouns and acronyms in the output; style rules govern grammar, not brand names, so a term like "iOS" or "NASA" may still need a manual touch.
Frequently asked questions
What is the difference between AP, APA, and Chicago title case?
Can I capitalize several titles at once?
Does it keep short words like 'and', 'the', and 'of' lowercase?
Which style should I use for blog post headlines?
Is my text uploaded anywhere when I capitalize a title?
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