logo
GeekFormat

Caesar Cipher

3

Only A-Z/ a-z moves, other characters remain unchanged

11 characters

Free online Caesar cipher encryption and decryption tool. Set custom shift values for cryptography learning, CTF challenges and puzzle solving.

Related

Unicode Escape

Base64 Batch Decoder

Base64 Batch Encoder

URL Encode

JSON Compress

SQL Formatter

Use Cases

  • Encrypt and decrypt text using Caesar cipher with custom shift values
  • Solve CTF challenges and cryptography puzzles using shift cipher analysis
  • Learn classical cryptography concepts and understand shift cipher principles
  • Try different shift values to decode encrypted messages

Features

  • Flexible shift settings: support custom shift values for encryption and decryption
  • Learning and CTF friendly: ideal for classical cryptography education and CTF challenges
  • Instant results: quickly try different shift values to find the correct decryption
  • Simple and intuitive: no complex configuration, just enter text and set the shift value

How to Use

  1. Enter the text to encrypt or decrypt
  2. Set the shift value (positive for encryption, negative for decryption)
  3. The tool automatically applies the Caesar cipher
  4. Copy the result or try different shift values

FAQ

What is a Caesar cipher?

A Caesar cipher is a simple substitution cipher that shifts each letter by a fixed number of positions in the alphabet. It is one of the earliest and simplest encryption techniques.

How do I decrypt a Caesar cipher?

Set the shift value to the negative of the encryption shift. If you don't know the shift value, try all 25 possible shifts to find readable text.

Is Caesar cipher secure for real-world use?

No. Caesar cipher is extremely weak and easily broken. It is mainly used for educational purposes, CTF challenges and simple puzzles.

Can I use custom shift values?

Yes. You can set any shift value from 1 to 25 for English text. This helps you explore different encryption and decryption scenarios.