ROT13 Cipher
Encode and decode text with the ROT13 letter cipher.
Input
Output
ROT13 shifts every letter 13 places in the alphabet. Because 13 is half of 26, the same operation encodes and decodes.
How to use
- Type or paste your text on the left.
- The ROT13 result appears instantly on the right.
- Run ROT13 again to reverse it.
Frequently asked questions
- Is ROT13 secure?
- No. It offers no real security — it only hides text from casual reading.
- Does it change numbers or symbols?
- No, only A–Z and a–z are rotated; everything else stays untouched.