Case Converter

With “Keep URLs, emails and acronyms” checked, URLs and email addresses stay as they are in the text-case conversions (not in the programming cases). Acronyms like NASA and mixed-case words like iPhone stay as they are in Sentence case, Title Case and Capitalized Case. If most of the text is in capitals (for example, typed with Caps Lock on), everything is converted, acronyms included.

Yes. Letters with accents keep their marks, German ß becomes SS in uppercase, and each language version uses its own rules (for example, Turkish i becomes İ).

In Sentence case, a new line only starts a new sentence if the line before ends with . ! ? or :, or after an empty line. So a sentence that was simply wrapped onto the next line is not capitalized in the middle.

camelCase joins words and capitalizes each one after the first (userName). PascalCase capitalizes every word (UserName). snake_case joins lowercase words with _, kebab-case with - and dot.case with a dot. CONSTANT_CASE joins uppercase words with _.

Words are split on spaces and symbols, and also where a lowercase letter meets an uppercase one, so userID parseHTMLString becomes user_id_parse_html_string. If you paste several lines, each line becomes its own name.

a, an, the, and, but, or, for, nor, so, yet, as, at, by, in, of, off, on, per, to, up and via. The first and last word, and the first word after : ? ! or a dash, are always capitalized. Each line is treated as a separate title.

iNVERSE swaps upper and lower case, which fixes text like hELLO typed with Caps Lock on. aLtErNaTiNg capitalizes every other letter, like hElLo, for playful or mocking text.

The last 50 versions are kept. Each click on Undo goes back one step. Text removed with Clear, or replaced by opening a file, can be brought back too.

Yes. Open a text file (.txt, .md, .csv and similar) up to 5 MB; it is read as UTF-8. Save the result as a .txt file with “Save (.txt)”.

Yes. On a narrow screen the buttons wrap onto several rows and the counts move below. The result replaces the text in the same box, so you can tap Copy right away.

It can't fix proper nouns typed all in lowercase: in Title Case, iphone becomes Iphone. Title Case follows one fixed list of short words rather than a choice of style guides. In snake_case and the other programming cases, accented letters like é are kept, not stripped.

Characters are counted as you see them, so an emoji built from several parts counts as one. A word is a run of letters or numbers. Lines are counted by line breaks, not counting a final line break.