© 2025 Babal Tools
Encode/decode text using ROT13 cipher.
Replaces each letter with the 13th letter after it in the alphabet.
Applying ROT13 twice returns the original text.
Type in either box to see the immediate conversion in the other.
ROT13 ("rotate by 13 places") is a simple letter substitution cipher that replaces a letter with the 13th letter after it in the alphabet. It's a Caesar cipher with a fixed shift of 13. This tool provides a fun and easy way to encode and decode messages, often used in online forums to hide spoilers or jokes.
Type or paste your message into the "Plain Text" box on the left to encode it.
Alternatively, type a ROT13-encoded message into the "ROT13 Text" box on the right to decode it.
The conversion happens instantly in the opposite text box as you type.
Use the copy button below either box to save the result to your clipboard.
ROT13 is its own inverse; the same function is used for encoding and decoding.