Text
ROT13 / Caesar Cipher
Rotate letters by a configurable shift (1-25). This is a reversible cipher — encoding and decoding use the same operation.
Result (ROT13)
Gur dhvpx oebja sbk whzcf bire gur ynml qbt.
Frequently asked questions
What is ROT13?
ROT13 is a Caesar cipher that shifts each letter by 13 positions. Since the alphabet has 26 letters, applying ROT13 twice returns the original text — making it its own inverse.
Is ROT13 secure?
No! ROT13 is not a secure encryption method. It provides no real security and is considered obfuscation at best. It's commonly used to hide spoilers or puzzle solutions.
How do I decode ROT13 text?
Just paste the encoded text and set the same rotation value. Since ROT13 is symmetric (applying it twice gives the original), encoding and decoding use the same operation.
What's the difference between ROT13 and a Caesar cipher?
ROT13 is a specific Caesar cipher with a shift of 13. Our tool lets you use any shift from 1 to 25, making it a general Caesar cipher tool.
Apply a ROT / Caesar cipher with any shift from 1 to 25. Only letters are rotated; numbers, punctuation, and whitespace are preserved. The same operation encodes and decodes.