ROT13 Cipher
Encode or decode text using the ROT13 letter-substitution cipher.
How to use ROT13 Cipher
- 1Paste text into the box.
- 2The ROT13 result appears immediately.
- 3Running ROT13 again on the result returns the original text.
Why use this tool
- ROT13 is its own inverse — one tool handles both encoding and decoding.
- Classic, simple obfuscation for spoilers, puzzles or forum posts.
Frequently asked questions
Is ROT13 secure?
No — ROT13 is a simple letter-rotation cipher intended for casual obfuscation (like hiding spoilers), not for actual security or encryption.