CodeBeautifyROT13 / Caesar Cipher
Shift letters by a chosen amount (13 by default, for classic ROT13) to obscure text — reversible by applying the same shift again.
Input
Output
ROT13 is a Caesar cipher with a fixed shift of 13, which makes it self-reversible — applying it twice returns the original text. This tool supports any shift amount from -25 to 25.
Frequently asked questions
How do I decode ROT13 text online?
Paste the ROT13 text and click Apply Shift with the shift set to 13 (the default) — since ROT13 is symmetric, encoding and decoding are the same operation.
Is ROT13 or a Caesar cipher secure?
No — both are trivially breakable and are only meant to obscure text casually (e.g. hiding spoilers), not to protect sensitive data.