ROT13 Decoder
Encode or decode text with ROT13. Same action both ways.
About ROT13
ROT13 is a simple letter substitution. Each letter is replaced by the letter 13 places after it (wrapping A–Z and a–z). Applying it again reverses the result. It is not encryption — use only for spoilers or light obfuscation.
Frequently Asked Questions
What is ROT13?
ROT13 shifts each letter by 13 positions in the alphabet. Because the alphabet has 26 letters, applying ROT13 twice returns the original text. It is not secure — use only for spoilers or fun.
Does it work on numbers and symbols?
Only A–Z and a–z are rotated. Numbers, spaces, and punctuation are left unchanged.
Is my text sent to a server?
No. Encoding and decoding happen entirely in your browser.