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ROT13 Encoder/Decoder
Encode and decode text using the ROT13 cipher algorithm - a simple letter substitution cipher
Options
Input Text
ROT13 Result
ROT13 encoded/decoded text will appear here...
ROT13 Reference
Alphabet Mapping
Original: ABCDEFGHIJKLMNOPQRSTUVWXYZ
ROT13: NOPQRSTUVWXYZABCDEFGHIJKLM
Example Transformations
Hello → Uryyb
World → Jbeyq
ROT13 → EBG13
Cipher → Pvcure
About ROT13
What is ROT13?
ROT13 is a simple letter substitution cipher that replaces each letter with the letter 13 positions after it in the alphabet. It's a special case of the Caesar cipher with a shift of 13.
Key Properties
- • Self-inverse: applying ROT13 twice returns original text
- • Only affects letters (A-Z, a-z)
- • Preserves case by default
- • Numbers and special characters unchanged
Use Cases
- • Hide spoilers in online discussions
- • Simple text obfuscation
- • Educational cryptography examples
- • Puzzle and game creation
- • Basic data encoding (not secure)
Note: ROT13 is not secure encryption. It's easily broken and should only be used for simple obfuscation.