ROT13 Cipher
Encode and decode text using the ROT13 Caesar cipher
1. What is 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. Since there are 26 letters, applying ROT13 twice returns the original text, making it a self-inverse cipher.
2. How does it work?
Using This Tool
Enter any text in the input field and click Convert. The same operation both encodes and decodes text. Non-alphabetic characters (numbers, punctuation, spaces) remain unchanged.
Use Cases
ROT13 is commonly used to obscure spoilers, puzzle solutions, or potentially offensive content in online forums. It's not secure encryption - just simple obfuscation.
3. Examples
Simple text
Hello World → Uryyb JbeyqWith numbers and symbols
Test123! → Grfg123!Double conversion returns original
ABC → NOP → ABC