ROT13 Cipher

Apply ROT13 transformation to text. Run twice to decode ROT13-encoded text.

💡 About ROT13 Cipher

ROT13 is a simple letter substitution cipher that shifts each letter 13 positions in the alphabet.

Key features:

  • Symmetric: Applying ROT13 twice returns original text
  • Case-preserving: Uppercase stays uppercase, lowercase stays lowercase
  • Letters only: Numbers, spaces, and symbols remain unchanged
  • Historical use: Common in online forums for spoiler protection

Example: "Hello World" → "Uryyb Jbeyq"

⚠️ Security Note: ROT13 is NOT secure encryption—it's easily broken and should only be used for obfuscation.

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