About
About CaseConvert
CaseConvert is a free case converter built on one idea: if a tool claims a style guide's name, it should follow that guide's actual rules — and say where the rules run out.
The Title Case rules used here
AP Stylebook: capitalize all words except articles, conjunctions, and prepositions of three letters or fewer; prepositions of four or more letters are capitalized. Chicago Manual of Style: capitalize all words except articles, conjunctions and prepositions of any length. Both: capitalize the first word, the last word, and the first word after a colon; capitalize all verbs and pronouns. Words typed in ALL CAPS are treated as acronyms and preserved, except where a boundary rule applies.
Stated limits
- Chicago capitalizes prepositions used adverbially or adjectivally (phrasal-verb particles such as “Up” in “Looking Up”). Detecting that needs grammar analysis; this tool keeps such words lowercase and says so.
- Sentence case lowercases everything mid-sentence, so proper nouns lose their capitals. No letter-rule tool can recover them reliably.
- Case mapping follows Unicode defaults. Languages with special rules (the Turkish dotted İ is the famous case) may need a manual check after conversion.
How it runs
Every tool on this site runs in your browser. There is no server component: no text is uploaded, stored or logged, which the Privacy page spells out. CaseConvert is part of a small family of free tools — the sister sites in the footer below cover counting, units, timers and more, each built the same way.
Saved style presets, batch files and one-click headline styles for whole documents. The free converter above stays free; Pro is a heads-up, not a checkout — no payment is taken today.