ROT / Caesar is a free encode & crypto tool that runs entirely in your browser — rotate letters, ROT13 & shifts. No upload, no account, no limits.
Apply a ROT/Caesar shift cipher to text. Slide the shift from 0–25 (ROT13 is the classic self-inverse), use quick presets, or invert the current shift. Only A–Z letters rotate — digits, spaces and punctuation pass through unchanged.
Yes — ROT13 is its own inverse, so applying it twice returns the original text.
No. A Caesar cipher is trivially broken and is for fun or obfuscation only, never real protection.
Every calculation happens on this page, in your own browser. Your input is never sent to a server, never logged and never used for training — which also means the tool keeps working when you are offline.