Case Converter — Change Text to Upper, Lower, Title or Sentence Case

1. 1Paste your textPut the text into the first box. Line breaks and paragraphs are preserved, and there is no length limit.
2. 2Choose a casePick an everyday option — uppercase, lowercase, title case, sentence case, capitalise every word, alternating or inverted — or a developer format such as camelCase.
3. 3Copy or download the resultThe converted text appears immediately. Copy it, download it as .txt, or select “Use as input” to run a second conversion.

UPPERCASE and lowercase convert every letter. Title Case capitalises the significant words and leaves short function words lowercase. Sentence case lowercases everything, then capitalises the first letter of each sentence. Capitalise Every Word raises every word's first letter with no exceptions, matching most spreadsheet PROPER functions.

Alternating case lowercases and uppercases letters in turn, ignoring spaces and punctuation. Invert case flips each letter, the fastest fix for text typed with caps lock on. Casing is locale-aware, so Turkish dotted and dotless i, German ß and Greek final sigma go through the browser's Unicode implementation rather than an ASCII shift.

Title case capitalises the first and last words plus the significant words between them, leaving articles, short prepositions and coordinating conjunctions lowercase. Mid-line, this tool keeps lowercase: a, an, and, as, at, but, by, for, if, in, nor, of, on, or, per, so, the, to, up, via, vs and yet. “the end of the road” becomes “The End of the Road”.

Style guides disagree. AP capitalises prepositions of four letters or more, writing “Over” and “With” where Chicago may not. No automated conversion satisfies every guide, and the convention is English-specific: French and Spanish titles use sentence case, and German capitalises all nouns regardless of position.

Sentence case lowercases the whole text, then capitalises the first letter after each full stop, question mark, exclamation mark or line break. Because it lowercases first, proper nouns go with it: “I flew to Paris in March” becomes “I flew to paris in march”. That is unavoidable without a dictionary of names, so use it on text written in all caps and fix names by hand.

camelCase, PascalCase, snake_case and kebab-case strip spaces and punctuation and rejoin the words. Input is split on whitespace, punctuation and existing camel-case humps, so “userFirstName”, “user first name” and “user-first-name” yield the same tokens and convert freely between formats. camelCase lowercases the first word and capitalises the rest, PascalCase capitalises all, snake_case joins with underscores and kebab-case with hyphens — also the convention for URL slugs.

Conversion is string manipulation done by your browser as you type. The text stays in the page's memory, is never sent to a server, and is discarded when you close the tab. Downloads are generated locally. No account, no autosave, no analytics.