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Letter to Number Converter
Convert text to alphabet positions (A=1, B=2, … Z=26) and convert number sequences back to letters. Used for puzzles, ciphers, classroom activities and simple codes.
The A1Z26 system
Each letter is replaced by its position in the alphabet: A=1, B=2, C=3 … Z=26. So "CAT" becomes 3-1-20. It is one of the oldest simple substitution ciphers and a staple of puzzle hunts and escape rooms. Choose your separator (space, dash or none) and direction above; spaces between words are kept as word breaks in number mode.
Frequently Asked Questions
What number is the letter M?
13 — M is the 13th letter of the alphabet.
Can I decode numbers back to letters?
Yes — switch the direction to "Numbers to Letters" and paste a sequence like 8 5 12 12 15 to get HELLO.
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