ROT13 & Caesar Cipher
Encode and decode text with ROT13 or any Caesar cipher shift (1–25). A fun, classic letter-substitution cipher that runs entirely in your browser.
This is encoding, not encryption. Caesar shifts are easy to reverse and should never protect sensitive data.
Click a row to try that shift. English-like results are highlighted.
| Shift | Decoded text | Score |
|---|
More ciphers? Morse code translator · binary: Binary translator.
About the Caesar cipher
Named after Julius Caesar, this classic cipher shifts every letter by a fixed amount. Use the brute-force table when you do not know the shift — look for readable English.
FAQ
What is ROT13?
ROT13 is a Caesar cipher with a shift of 13. Because the alphabet has 26 letters, applying ROT13 twice returns the original text.
How do I decode a Caesar cipher?
Set the same shift used to encode and switch to Decode — it shifts the letters back. If you do not know the shift, try each value 1–25 or use the brute-force table below.
Are numbers and symbols changed?
No. Only ASCII letters A–Z and a–z are shifted. Digits, punctuation, emoji, and non-Latin scripts such as Chinese stay unchanged.
Last updated: