ROT13 Cipher
A simple, reciprocal substitution cipher.
About the ROT13 Cipher
ROT13 ("rotate by 13 places") is a simple letter substitution cipher that replaces a letter with the 13th letter after it in the alphabet. It's a special case of the Caesar cipher. Applying ROT13 to a piece of text and then applying it again will restore the original text, making it a reciprocal cipher. It's often used in online forums to hide spoilers, punchlines, or puzzle solutions from a casual glance.
How to Use This Tool
- Enter Text: Type or paste the message you want to either encode or decode into the input text area.
- Automatic Conversion: The tool will instantly apply the ROT13 cipher and show the result in the output box.
- View Result: Since ROT13 is its own inverse, the same process works for both encryption and decryption.