Case converter
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Thirteen cases in one place: the writing ones — upper, lower, title, sentence — and the programming ones, camelCase through CONSTANT_CASE.
How to use the case converter
Title case is the one with real disagreement behind it. This capitalises every word except articles, coordinating conjunctions and short prepositions, and always capitalises the first and last word regardless — that is the overlap between the Chicago and AP rules. Past that they diverge: AP capitalises prepositions of four letters or more, Chicago does not, so "Fall Into" versus "Fall into" is a genuine style choice rather than a mistake. If you are writing to a house style, check which one it follows. The programming cases are unambiguous by comparison, and the conversion works from any of them to any other — camelCase in, snake_case out, in either direction.
Questions
Title case leaves small words like "of" and "the" lowercase unless they are first or last. Capital case capitalises everything.