Case Converter

Everything happens in your browser with a local converter: what you paste is never uploaded or stored. Sentence case capitalises the first letter of each sentence and of each line, so a list keeps its capitals while a paragraph gets none scattered through it. Title case capitalises words while leaving short joining words such as of, and and the in lower case, except at the start, at the end and after a colon. In mixed text, a word in capitals such as NASA or PDF is an acronym and a word with an inner capital such as iPhone is a name, and both are kept; sentence case also keeps the English pronoun I. The code styles split on spaces, hyphens, underscores and existing capital letters, acronyms included (XMLHttpRequest becomes xml_http_request), one line at a time, so a list of names converts in one go. CONSTANT_CASE, inverted and alternating case are there too, and Turkish text is cased with the Turkish rules for i and ı.

Where it stops: Capitalisation rules are language-specific and these follow English conventions, so title case on another language will not always match its house style. A proper noun written in lower case cannot be recognised, so sentence case will not capitalise paris, and when the whole text is in capitals there is no way to tell an acronym from an ordinary word. Check anything where the original capitalisation carried meaning.