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, you can switch tabs and click the button for either mode without needing to retype your text.
No practical limit is enforced; you can reverse text of any length you paste into the input box.