Caesar Cipher
Encrypt and decrypt text using Caesar cipher with configurable shift (1-25)
Processed on your device — never uploaded
13
Input Text
Encrypted Output
Frequently Asked Questions
What is a Caesar cipher?
A Caesar cipher is one of the oldest encryption techniques, named after Julius Caesar. It works by shifting each letter in the text by a fixed number of positions in the alphabet.
How do I decrypt a Caesar cipher without knowing the shift?
Use the brute force table shown below the output. It displays all 25 possible shifts at once, so you can visually scan for the one that produces readable text.
Is Caesar cipher the same as ROT13?
ROT13 is a specific case of the Caesar cipher with a shift of 13. Since the alphabet has 26 letters, ROT13 is its own inverse, meaning encoding and decoding use the same operation.
Is the Caesar cipher secure?
No. The Caesar cipher is trivially easy to break since there are only 25 possible shifts to try. It is used for learning and puzzles, not for securing sensitive data.