Cipher & Encoding Tools

Find your inner spy!

Whether you spell it Cipher or Cypher, you've come to the right place! Our collection of encoding and decoding tools will help you create secret messages, solve puzzles, or simply learn about classical cryptography.

Choose a cipher below to get started encoding and decoding your messages.

Caesar Cipher

The classic substitution cipher used by Julius Caesar. Each letter is shifted by a fixed number of positions in the alphabet.

  • Easy to use
  • Adjustable shift amount
  • Great for beginners
Use Caesar Cipher

Atbash Cipher

An ancient Hebrew cipher that simply reverses the alphabet. A becomes Z, B becomes Y, and so on.

  • No key required
  • Self-reciprocal
  • Historical significance
Use Atbash Cipher

Vigenere Cipher

A polyalphabetic cipher that uses a keyword to create multiple shifting patterns, making it harder to crack.

  • More secure
  • Keyword-based
  • Resists frequency analysis
Use Vigenere Cipher

ROT13 Cipher

ROT13 (“rotate by 13 places”) is a special case of the classic Caesar Cipher. Instead of selecting your own shift, ROT13 always rotates each letter exactly 13 positions through the alphabet.

  • Easy to use
  • Caesar Cipher with a fixed key
  • Great for beginners
Use Rot13 Cipher

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What is a Cipher?

A cipher (also spelled cypher) is a method of transforming text to conceal its meaning. Ciphers have been used throughout history to protect sensitive information, from military communications to personal secrets.

Types of Classical Ciphers

Classical ciphers fall into two main categories:

  • Substitution Ciphers: Each letter is replaced with another letter or symbol. Caesar, Atbash, and Vigenere are all substitution ciphers.
  • Transposition Ciphers: The letters remain the same but their positions are rearranged.

Why Learn About Ciphers?

Understanding classical ciphers provides a foundation for learning about modern cryptography. They're also commonly used in puzzle games, escape rooms, geocaching, and educational settings. Whether you're a puzzle enthusiast, a student, or just curious about secret codes, these tools will help you encode and decode messages quickly and easily.