Converts all letters in the text to uppercase (e.g., "HELLO WORLD").

Converts all letters in the text to lowercase (e.g., "hello world").

Converts the first letter of every word to uppercase and the rest to lowercase (e.g., "Hello World").

Converts the first letter of each sentence to uppercase. It identifies sentences ending with a period, question mark, or exclamation mark.

Capitalizes the first letter of each word, but keeps small, common words (like "a", "an", "the", "for") in lowercase, unless they are the first or last word of the text. This is commonly used for headlines and titles.