It offers two tabs: "Character Reverse," which reverses every character in the text, and "Word Reverse," which reverses the order of the words while keeping each word intact.
It reverses every character, so "Hello World" becomes "dlroW olleH".
It reverses the order of the words while keeping each word spelled normally, so "Hello World" becomes "World Hello".
Yes — toggle between modes without needing to re-paste your text; the tool reprocesses the same input instantly.
No practical limit — even very long passages reverse instantly, since the operation is simple text processing done entirely in your browser.