Pick a mode. "Reverse all characters" turns Hello World into dlroW olleH. "Reverse word order" gives World Hello. "Reverse letters in each word" gives olleH dlroW. "Reverse line order" flips a multi-line list so the last line comes first.
Yes. Text is split into whole characters rather than raw code units, so emoji stay intact instead of turning into broken symbols.
Not directly, but a word is a palindrome when reversing all its characters gives the same word back.
See also: case converter · sort lines · word counter
Also: Morse code translator and text repeater.
Also: palindrome checker and anagram checker.