A1Z26
Convert letters and numbers with A1Z26, A0Z25, and two reversed variants.
Automatically turn letters into numbers and numbers back into letters with A1Z26, A0Z25, A26Z1, and A25Z0 mappings. Both areas stay synchronized and out-of-range numbers wrap around the alphabet.
Settings
Conversion direction
Letter-number mapping
Number separator
Word separator
Numbers
ResultLetters
SourceQuick explanation
Enter text or a number sequence: the other area updates automatically. Choose the letter-number mapping, customize the separator, then copy or download the area you need. Values beyond the alphabet range wrap around: in A1Z26, 27 becomes A.
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Need a coordinate-based code?
Use the Polybius square to represent each letter with a pair of coordinates in a 5 × 5 grid.
Additional information
Understanding A1Z26 and its variants
A1Z26 is a very simple alphabetic substitution: each letter is replaced by its position in the Latin alphabet. A is 1, B is 2, and Z is 26. It is not secure encryption, but it is common in riddles, treasure hunts, escape rooms, and introductory code exercises.
The tool also provides three useful variants. A0Z25 starts at zero, A26Z1 reverses the alphabet while keeping values from 1 to 26, and A25Z0 reverses the alphabet with values from 0 to 25.
| Mode | A | B | Z | SECRET example |
|---|---|---|---|---|
| A1Z26 | 1 | 2 | 26 | 19 5 3 18 5 20 |
| A0Z25 | 0 | 1 | 25 | 18 4 2 17 4 19 |
| A26Z1 | 26 | 25 | 1 | 8 22 24 9 22 7 |
| A25Z0 | 25 | 24 | 0 | 7 21 23 8 21 6 |
How are out-of-range numbers read?
Numbers beyond the alphabet range wrap around. In A1Z26, 1 gives A, 26 gives Z, 27 gives A again, and 52 gives Z again. This behavior is useful when testing puzzle sequences that intentionally go beyond 26.
Separators mainly make the values easier to read. You can use a space, comma, dash, or another short separator. A slash marks a word break in the number area.
Usage tips
When creating a riddle, start with a short word and make sure the selected mapping is understandable for the person decoding it. When solving a message, first look at the value range: many numbers from 1 to 26 suggest A1Z26, while zeros can point to A0Z25 or A25Z0.
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