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.
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.
Supported Tools:
