Case Converter

What this tool does

The Case Converter changes the capitalization of any text in one click, so you don't have to retype it. It also counts words and characters.

How to use it

Paste your text, click a button, then press Copy Text.

The options

• UPPERCASE: every letter capital. Good for short headings; long passages in capitals are harder to read.
• lowercase: every letter small.
• Sentence case: a capital only at the start of each sentence. Names and the word "I" become lowercase too, so check them afterwards.
• Capitalize Each Word: a capital at the start of every word.
• Title Case: capitals on the main words, while short words like a, an, the, and, or, of, in and to stay lowercase unless they come first or last.
• aLtErNaTiNg and iNVERSE cASE: for fun, and for fixing text typed with Caps Lock on.

Title case: which rules?

Style guides agree on the basics: capitalize the first and last word and all nouns, verbs, adjectives and adverbs, and lowercase articles (a, an, the) and short conjunctions (and, but, or). They differ on prepositions:

• AP style capitalizes any word of four or more letters: "The Fox Jumps Over the Dog".
• The Chicago Manual of Style (18th edition, 2024) lowercases prepositions of up to four letters and capitalizes longer ones: "The Fox Jumps over the Dog", but "All About Eve".
• APA style (academic writing) also capitalizes words of four or more letters.

This tool's Title Case follows the AP-style rule: it lowercases a, an, the, short conjunctions and prepositions of three letters or fewer (of, in, on, to, at, by, for, via and others) and capitalizes everything else, including With, From and Over. For Chicago style, lowercase four-letter prepositions such as with, from, over and into yourself. For example, the tool turns "how to train your dragon with a little help from the stars" into "How to Train Your Dragon With a Little Help From the Stars"; in Chicago style it would be "How to Train Your Dragon with a Little Help from the Stars". Check your publication's style guide for anything formal.

Frequently asked questions

Does it work with accents and other languages?

Yes. Letters like é, ñ and ü change case correctly.

Is my text saved?

No. Everything happens in your browser.

Should headlines use title case or sentence case?

Both are correct; it's a house style. AP's title-case rules are for titles of works, such as books and songs, while AP news headlines use sentence case. Many websites and apps also use sentence case for headings because it's quicker to read.

What about camelCase and snake_case?

Those are naming styles for code: camelCase (firstName), PascalCase (FirstName), snake_case (first_name) and kebab-case (first-name). They remove spaces, so they aren't offered here.

Related tools: Social Caption Formatter and Word Count & Read Time Calculator.

Sources: Capitalization rules summarized from The Chicago Manual of Style (18th edition, 2024), the AP Stylebook and the APA Publication Manual (7th edition). Last reviewed on SuiteWebTools: October 2026.