Cryptography & Ciphers
A1Z26 Cipher Encoder
Convert English letters into numbers from 1 through 26. Choose a supported separator and review the letter-number result.
This tool runs open-source code from CyberChef by GCHQ (Apache License 2.0). See open-source credits.
Letters use their English alphabet positions. Uppercase and lowercase letters produce the same number.
The result joins letter numbers with the selected delimiter, without a leading or trailing delimiter.
- Write a number-code clue for a scavenger hunt, escape room, or classroom puzzle.
Turn letters into alphabet positions
Input: Hello, World!
Settings: Delimiter Space.
Result: 8 5 12 12 15 23 15 18 12 4
Only the letters produce numbers. Decoding cannot restore the original punctuation, spaces, or case.
Choose a delimiter and check discarded characters
- Enter the message in Input.
- Choose Delimiter.
- Encode words separately when you need to preserve their boundaries.
- Accented letters and other non-English letters produce no number.
- The code provides no secrecy.