Lower case is when no word is capitalized
Title case is when the first letter of each word, in a title, is capitalized.
Upper case is when every letter in a word or phrase is capitalized and proper case is when the first letter of all words are capitalized.
Sentence case refers to when the first letter of a sentence is capitalized.
Start by typing/pasting in your text into the box on top and then click on one of the conversion options. Your text will be altered and shown in the bottom box.