Paste any text and switch it to UPPERCASE, lowercase, Title Case, Sentence case, aLtErNaTiNg, inverse, snake_case or kebab-case in one click — no retyping. Live character and word counts update as you type, and the Copy button grabs the result instantly.
Title Case is the US standard for headlines, book titles, and email subject lines. This tool follows the AP-style pattern most American publications use: the first and last word are always capitalized, and short words like a, an, the, of, in, on, at, to and for stay lowercase in the middle of the title. Chicago style differs mainly in how it treats longer prepositions, so check your style guide for edge cases. Sentence case — capital letter only at the start of each sentence — is what Google tends to show in search results and what most modern web headlines use.
UPPERCASE is for acronyms, legal disclaimers and emphasis (sparingly — it reads as shouting). snake_case and kebab-case are developer conventions for variable names, file names and URL slugs. aLtErNaTiNg cAsE is the sarcasm-meme format, and inverse case rescues text typed with Caps Lock accidentally on.
Keyboard tip: in Microsoft Word you can cycle a selection between lowercase, UPPERCASE and Capitalized with Shift + F3 — but it does not know AP title-case rules, which is exactly what this converter handles for you.
Frequently asked questions
Title case capitalizes the main words in a headline while keeping short function words lowercase. In AP style, articles (a, an, the), short conjunctions and short prepositions stay lowercase unless they are the first or last word. Chicago style is similar but lowercases all prepositions regardless of length, so "Through" is capitalized in AP but lowercase in Chicago. This converter follows the common AP-style pattern.
Capitalize the first and last word, plus every noun, verb, adjective, adverb and pronoun. Keep short words like a, an, the, of, in, on, at, to and for lowercase unless they start or end the title. The fastest way is to paste your headline above and click Title Case — then double-check any style-guide-specific words your publication cares about.
Yes for the text itself — the tool converts the plain text of whatever you paste, including line breaks. Visual formatting like bold, italics, fonts and colors is not carried into a plain-text box by the browser, so the result is clean unformatted text you can paste anywhere.
They are developer naming conventions. snake_case joins words with underscores (user_first_name) and is common in Python and database columns. kebab-case joins words with hyphens (user-first-name) and is the standard for URLs, file names and CSS classes. Both conversions here also strip punctuation and collapse spaces automatically.
Lowercase makes every letter small. Sentence case also lowercases everything but then capitalizes the first letter of each sentence — after every period, exclamation point, question mark and new line — which is how normal paragraphs are written.
Cite this calculator
APACalcBrew. (2026). Case Converter. https://calcbrew.com/case-converter