Capitalize Each Word

In short Capitalising each word makes the first letter of every word a capital and leaves the rest of the word exactly as it was, with no style-guide exceptions applied. That last part is the whole difference from Title Case: "the lord of the rings" becomes "The Lord Of The Rings" here and "The Lord of the Rings" in Title Case, because AP and Chicago both keep short prepositions and articles lowercase. Neither is more correct; they are for different jobs. Use this when every word genuinely should be capitalised — names, form fields, place lists, product names — and Title Case for headings that follow a style guide. Because the rest of each word is untouched, this is the safe choice for text that already contains deliberate internal capitals: "iPhone" and "McDonald" survive, where a converter that lowercases the remainder would produce "Iphone" and "Mcdonald". It is also why running it on ALL CAPS text does nothing visible — there is no lowercase to leave alone.