ROT13 / ROT47 Generator
Encrypt and decrypt text using ROT13, ROT5, ROT18, and ROT47 algorithms instantly.
Multiple Modes
Supports ROT13, ROT47 (ASCII), ROT5 (Numbers), and ROT18 (Mixed).
Secure
All transformations happen in your browser. No data sent to servers.
File Support
Drag and drop files to process large text content instantly.
Try These Examples
Classic ROT13
Standard ROT13 cipher (A-Z, a-z).
ROT13 Decode
Decode a ROT13 message back to English.
ROT47 (ASCII)
ROT47 shifts ASCII characters by 47 positions.
ROT18 (Full)
Combines ROT13 (letters) and ROT5 (numbers).
About ROT13 and ROT47
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 is a special case of the Caesar cipher which was developed in ancient Rome.
Because there are 26 letters (2×13) in the basic Latin alphabet, ROT13 is its own inverse; that is, to undo ROT13, the same algorithm is applied, so the same action can be used for encoding and decoding.
Supported Modes
- ROT13: Rotates letters (A-Z, a-z) by 13 positions. Leaves numbers and symbols unchanged.
- ROT5: Rotates digits (0-9) by 5 positions. Leaves letters unchanged.
- ROT18: A combination of ROT13 and ROT5. Rotates both letters and numbers.
- ROT47: A derivative of ROT13 that introduces a mix of numbers and special characters. It rotates ASCII characters 33 (!) through 126 (~) by 47 positions.