The case inverter converts the spelling of each letter in the reverse order: lowercase letters are converted to uppercase and vice versa. The tool switches the case of each character, which means that a usually capitalized beginning of sentences is as a result written in lowercase, whereas the rest of the word is capitalized. If most letters of an entered text are written in lowercase, the text after using the tool will be displayed mainly in uppercase. The effect of the tool is roughly equivalent to an activated caps lock key ("caps lock") on the keyboard: keeping it activated, every letter will be written in uppercase without pressing Shift constantly. Once the Shift key is pressed additionally, lowercase letters are generated.