🔐 ROT13 Encoder

What is ROT13 Encoder?

ROT13 Encoder is a simple substitution cipher tool that replaces a letter with the 13th letter after it in the alphabet. Because there are 26 letters in the alphabet, applying ROT13 twice restores the original text. It is famously used on forums to hide spoilers and puzzle solutions.

How to Use ROT13 Encoder

1. Type or paste the text you want to hide (or reveal)
2. The tool instantly applies the ROT13 cipher
3. Copy the result to share

Why Use Our ROT13 Encoder?

• Obscure text quickly with a classic substitution cipher
• Decode ROT13 text by running it through the tool again
• Leaves numbers and punctuation completely untouched
• Requires no keys or passwords to use

Common Use Cases

• Hiding movie spoilers on social media or Reddit
• Obscuring the solution to a riddle or coding challenge
• Learning the basics of historical cryptography

Frequently Asked Questions

• What is ROT13?▾
  ROT13 is a simple substitution cipher that replaces a letter with the 13th letter after it in the alphabet.