Case Converter

Case Converter changes the capital letters in any text without retyping it. Paste a heading typed with Caps Lock on, a list of names in random capitals or a sentence you want as a variable name, choose one of thirteen styles, and the result appears straight away underneath, ready to copy.

Writers and students get the everyday styles: UPPER CASE, lower case, Sentence case and a proper Title Case that follows the AP and Chicago habit of keeping short words such as “of”, “the” and “and” in lower case unless they start or end the title. Developers get camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE and dot.case, which split words at spaces, punctuation and existing capitals, so “XMLHttpRequest” becomes xml_http_request.

It is careful with languages other than English. Accented letters keep their accents, the German ß becomes SS in capitals, Greek gets its final ς, and a Turkish or Azerbaijani setting gives the dotted İ and dotless ı those languages need. Everything happens in your browser: the text is never uploaded and nothing is stored.

1. Type or paste into “Your text”, or press “Paste” to bring in what you last copied.
2. Under “Change to”, tap a style. Each button is written in its own style, so you can see what you will get.
3. Tick “Remove extra spaces” or “Remove line breaks (keeps paragraphs)” to tidy text copied from a PDF or email.
4. Read the result in the bottom box. It updates on every keystroke and shows its character count.
5. Press “Copy”, or “Use as my text” to keep editing the result. “Undo” brings your original back.

• Thirteen styles: UPPER CASE, lower case, Sentence case, Title Case, Capitalised Each Word, aLtErNaTiNg, iNVERSE cASE, camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE and dot.case.
• Title Case with small-word rules: articles, short conjunctions and short prepositions stay lower case, except as the first or last word or after a colon.
• Sentence case that capitalises the start of every sentence and line and fixes a lone “i” to “I”, including I’m, I’ll, I’ve and I’d.
• An option to keep words like iPhone, NASA and McDonald exactly as typed in Sentence and Title Case.
• Code styles that understand existing camelCase and acronyms, and can remove accents (é → e) for safe file names and variable names.
• Letter rules for Turkish and Azerbaijani (i ↔ İ, ı ↔ I) and Dutch (ijsland → IJsland), on top of the standard Unicode rules for every alphabet with capitals.
• Line breaks are kept: every line is converted on its own, so a list stays a list.
• Clean-up options for extra spaces and broken lines, applied before the conversion.

• Title Case can’t know every proper noun. “The Return of the King” is right, but a name like “van Gogh” may need a manual touch afterwards.
• If your whole text is in capitals, “Keep words like iPhone and NASA” has nothing to go on, so every word is converted. Turn it off when you want acronyms changed too.
• Convert a column of names or headings in one go: paste them on separate lines and each line is handled separately.
• For a web address slug, use kebab-case with “Remove accents” ticked: “Crème Brûlée Recipe” becomes creme-brulee-recipe.
• aLtErNaTiNg and iNVERSE cASE are for fun posts and memes. Screen readers read them normally, but they are hard on the eye in long text.