ROT13 Encoder
Encode and decode text using the ROT13 cipher.
About ROT13
ROT13 (rotate by 13 places) is a simple letter substitution cipher that replaces each letter with the letter 13 positions after it in the alphabet. Key features:
- A ↔ N, B ↔ O, C ↔ P, etc.
- Case-preserving (uppercase stays uppercase)
- Numbers and symbols remain unchanged
- Symmetric: encoding and decoding use the same operation
- Not secure - used for obfuscation, not encryption
Example: "Hello World" → "Uryyb Jbeyq"