Caesar Cipher
Encrypt and decrypt text using Caesar cipher.
Input Text
Output Text
Quick Shift:
Shift [[n]]: [[shiftText(n)]]
About the Caesar Cipher
The Caesar cipher shifts each letter of the alphabet by a fixed number. With a shift of 3, A becomes D and B becomes E. It is named after Julius Caesar, who used it in his letters.
How to use it
- 1 Type your message.
- 2 Choose a shift from 1 to 25.
- 3 Encrypt or decrypt and copy the result.
Frequently asked questions
What is ROT13?
ROT13 is a Caesar cipher with a shift of 13. Because the alphabet has 26 letters, applying ROT13 twice gives back the original text.
Is the Caesar cipher secure?
No. There are only 25 possible shifts, so anyone can try them all in seconds. Use it for puzzles and learning, not for real secrets.
Are numbers and punctuation changed?
No. Only letters are shifted; numbers, spaces, and punctuation stay the same.