ROT13 Encoder / Decoder
Encode or decode text with ROT13 — the classic Caesar cipher shift of 13.
How to use this tool
- Enter text in the fields above.
- Results update instantly as you type — or click Calculate.
- Read your rot13 result and the full breakdown beneath it.
Encode or decode text with ROT13 — the classic Caesar cipher shift of 13.
Frequently asked questions
- What is ROT13?
- ROT13 is a simple letter substitution cipher that replaces each letter with the one 13 positions after it in the alphabet. Applying it twice returns the original text.