Encode and decode text with the A1Z26 cipher, replacing each letter with its position in the alphabet (A=1, Z=26). Runs entirely in your browser.
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Encode and decode text with the A1Z26 cipher, replacing letters with their position in the alphabet. Runs entirely in your browser.
A1Z26 is a simple letter-to-number substitution where A is 1, B is 2, and so on up to Z is 26. It is a staple of puzzle hunts, escape rooms and beginner CTFs. This tool converts letters to numbers and numbers back to letters.
Input:
HELLO WORLD
Output:
8-5-12-12-15 23-15-18-12-4
How are words separated?
Numbers within a word are joined by hyphens, and a space separates words, so the original word breaks are preserved.
What if a number is out of range?
Decoding only accepts 1 to 26; anything outside that range is reported as an error.
Is it secure?
No. It is a direct mapping with no key, intended for puzzles and learning.
Does my text leave the browser?
No. It runs locally in your browser.