ROT13 / Caesar Cipher ROT13
| Shift | Output |
|---|
How It Works
ROT13 rotates each letter by 13 positions in the alphabet. Since the English alphabet has 26 letters, ROT13 is its own inverse — applying it twice returns the original text. It is commonly used to obscure spoilers or puzzle answers online.
Caesar cipher is the generalized form: rotate by any shift from 1 to 25. Julius Caesar reportedly used a shift of 3. The Decode direction reverses the shift automatically.
ROT5 applies the same rotation concept to digits (0–9) with a shift of 5. It is often combined with ROT13 as ROT18.
ROT47 operates on all 94 printable ASCII characters (! through ~), rotating by 47. It encodes punctuation and symbols as well as letters and digits.
Brute force mode runs all 25 possible Caesar shifts at once, which is useful when you have an unknown shift and want to scan for readable plaintext.
Alphabet Mapping Reference
| Plain | A | B | C | D | E | F | G | H | I | J | K | L | M |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ROT13 | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |
| Plain | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ROT13 | A | B | C | D | E | F | G | H | I | J | K | L | M |
Related: Hash data → Hash Generator