Change case

What this tool does

Paste some text, pick a case: conversion is instant. Eight cases are available: UPPERCASE, lowercase, Title Case, Sentence case, iNVERTED, plus three developer cases (kebab-case, snake_case, camelCase). Everything runs in your browser — the text is never sent anywhere.

Accents are preserved (“é” becomes “É”, never “E”) and Title Case follows the French rule: short function words — le, la, de, du, et, à… — stay lowercase unless they open the title. Acronyms such as TGV or TVA are kept, and French elisions are handled: “l’apostrophe” becomes “l’Apostrophe”.

Limits

Title Case and Sentence case rely on typographic rules, not on understanding the text: proper nouns are not detected, and a text already written in full capitals loses its acronyms (nothing tells them apart). Developer cases transliterate to ASCII: “é” becomes “e”, “œ” becomes “oe”, and non-Latin characters are dropped.