Atbash swaps each letter for the one at the opposite end of the alphabet: A becomes Z, B becomes Y, and so on. This tool uses the 26 English letters A–Z. You do not need a key, and the same swap works in both directions.
Read the alphabet backward
| Plain alphabet | Mapped alphabet |
|---|---|
| ABCDEFGHIJKLMNOPQRSTUVWXYZ | ZYXWVUTSRQPONMLKJIHGFEDCBA |
If A is 0, subtract the input letter’s position from 25 to find its partner. Applying that rule twice brings you back to the starting letter. The tool shows letters in uppercase and keeps spaces and punctuation by default.
Encode READ THE MAP
READ THE MAPA–Z reversed; preserve spacesIVZW GSV NZK| Input | Index | 25 − index | Output |
|---|---|---|---|
| R | 17 | 8 | I |
| E | 4 | 21 | V |
| A | 0 | 25 | Z |
| D | 3 | 22 | W |
Check repeated letters
Repeated letters stay repeated: the same input always has the same partner. That is why a word’s letter pattern can still help you solve an Atbash clue. Try putting IVZW GSV NZK back through the tool to recover READ THE MAP.
Try one yourself
Encode ZOO. Before using the tool, predict whether the two O letters will match in the output.