Paste your text, pick a letter case and copy the result. Your text never leaves this computer.
Yes. With the Turkish rules option on, i becomes İ and ı becomes I. Turn it off for English text.
It is meant for titles and names. It does not capitalize after an apostrophe, so "o'clock" stays "O'clock" instead of "O'Clock".
It lowercases the text, then capitalizes the first letter of every sentence and line.