Classic Ciphers Caesar ROT13 Vigenère Online
Encrypt and decrypt with the Caesar, ROT13 and Vigenère ciphers (educational).
🔒 100% client-side — no data sent
Encrypt and decrypt text with the classic Caesar, ROT13 and Vigenère ciphers, with a customizable shift or key. Perfect for learning, puzzles and recreational cryptography. Everything runs in your browser, with no data transmitted.
What is it for?
- ▸ Encrypt a message with Caesar
- ▸ Apply ROT13 to hide a spoiler
- ▸ Decrypt a Vigenère text with its key
- ▸ Learn the basics of classic cryptography
FAQ
Difference between Caesar and ROT13?
ROT13 is a Caesar with a fixed shift of 13, where encrypting and decrypting are identical.
How does Vigenère work?
It uses a repeated keyword for a different shift on each letter.
Are these ciphers safe?
No, they are educational and easy to break; never for sensitive data.