Encode or decode any text with ROT13 instantly
58 characters
Uryyb, Jbeyq! Gur dhvpx oebja sbk whzcf bire gur ynml qbt.
58 characters
ROT13 is a simple letter-substitution cipher that shifts every letter in the alphabet by 13 positions. Because the English alphabet has 26 letters, ROT13 is its own inverse — applying it twice returns the original text. It is widely used to obscure spoilers, puzzle answers, and mildly sensitive text in online communities. Use this free ROT13 encoder and decoder to transform any text instantly, right in your browser.
ROT13 (Rotate by 13) is a Caesar cipher variant that shifts each letter 13 places forward in the alphabet. A becomes N, B becomes O, and so on. Digits, punctuation, and spaces are left unchanged.
ROT13 is self-inverse, meaning you decode it exactly the same way you encode it — just paste the ROT13 text into the input field and the original text appears instantly in the output. No separate decode mode is needed.
No. ROT13 provides zero cryptographic security and should never be used to protect sensitive data. It is intended only for light obfuscation, such as hiding spoilers or puzzle answers from casual readers.
Only the 26 letters of the English alphabet (A–Z and a–z) are transformed. Numbers, spaces, punctuation, and all non-ASCII characters pass through completely unchanged.