Flip the case of every character: capitals become lower case and lower case becomes capitals. Handy for undoing text typed with caps lock on by mistake.
Hello WORLD from Utiloot
hELLO world FROM uTILOOT
Digits, spaces and punctuation pass straight through unchanged.
No. This tool runs entirely in your browser — nothing you type or paste is uploaded, logged or stored anywhere.
There is no fixed limit. Very large documents depend on your device’s memory, but ordinary pages and files are handled instantly.