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.
