Free Online ROT13 Encoder & Decoder
Apply the ROT13 substitution cipher to your text. Each letter is shifted 13 places in the alphabet. Applying ROT13 twice returns the original text.
How to Use the ROT13 Encoder/Decoder
1
Enter text to encode or decode.
2
The ROT13 result appears instantly.
3
Copy the output.
Frequently Asked Questions
What is ROT13?
ROT13 replaces each letter with the letter 13 positions after it in the alphabet. Since there are 26 letters, applying it twice gives back the original.
Does it affect numbers or symbols?
No. ROT13 only shifts letters (A-Z, a-z). Numbers, spaces, and symbols remain unchanged.
Is ROT13 secure?
No. ROT13 is a trivial cipher meant for obscuring text (like spoilers), not for security.