Case Converter

Naively capitalising the first letter of every word in a headline produces something that reads as visibly wrong to anyone used to seeing professionally edited titles — "The Cat Sat On The Mat" looks off in a way most readers could not immediately name, but would notice. Real Title Case, as used by AP and Chicago style guides, keeps short function words — articles like "a" and "the", coordinating conjunctions like "and" and "but", and short prepositions like "of", "in" and "to" — lowercase unless they are the first or last word of the title. "The Cat Sat on the Mat" is the version that reads as deliberately styled rather than mechanically capitalised.

The distinction exists because those short words carry grammatical function rather than semantic weight, and capitalising every one of them visually flattens a title into a wall of equally-emphasised words, obscuring which words actually matter. Editorial style guides converged on this convention decades ago specifically to keep headlines scannable.

Programming naming conventions are not interchangeable with each other despite looking superficially similar, because different languages and contexts have settled on different ones as their idiomatic default. Mixing them within one codebase is usually treated as a style violation rather than a preference.

Case conversion looks trivial for plain English text — shift each letter's code point by a fixed offset — but that shortcut breaks immediately on accented characters, and breaks in a different, more serious way on certain non-Latin scripts. A naive ASCII-only uppercase routine leaves é entirely untouched rather than producing É, silently failing on any text containing accents. Turkish presents a sharper case: the letter "i" uppercases to a dotted İ in Turkish, not the dotless I an English-based routine would produce, and applying the wrong rule to Turkish text produces a result a Turkish reader would immediately recognise as incorrect. Proper Unicode-aware casing handles these per-language rules correctly rather than silently mangling non-English text.

Rather than converting to one style and making you start over to see another, this tool computes every case style from the same input simultaneously, so switching between UPPERCASE, Title Case and snake_case is a matter of glancing at a different result rather than re-running the conversion. This is particularly useful when the right style is not yet decided — naming a new variable, for instance, where seeing camelCase and snake_case side by side makes the choice concrete rather than abstract.