How to Use the Alphabet Number Cipher Converter
The A1Z26 cipher is the most basic substitution cipher there is: it maps the letters A through Z to the numbers 1 through 26 in order. With a rule as simple as A=1, B=2, C=3, it offers almost no real cryptographic security, but it remains a classic device in escape rooms, treasure hunts, and puzzle content. This converter supports both encoding text into numbers and decoding numbers back into text.
Using it is simple. Choose Encode or Decode from the mode dropdown, pick a separator (hyphen, space, or period) to place between numbers, and type your text — the result updates instantly. When encoding, spaces are shown as a '/' to mark word breaks, while numbers or symbols that aren't letters are passed through unchanged. For example, encoding "HELLO" with a hyphen separator produces "8-5-12-12-15".
When decoding, enter a number sequence and it's converted back into letters. Any number outside the 1-26 range is shown as a question mark (?) so you can immediately spot invalid input. Use it to solve puzzle clues or to write your own coded message for a friend to crack.
Frequently Asked Questions
It's the simplest substitution cipher, mapping A=1, B=2, C=3, and so on through Z=26. It's formally called the A1Z26 cipher and is a common feature in escape rooms and puzzle games.
Spaces are represented with a '/' to mark word breaks, while non-letter characters like numbers or symbols are left unchanged. Decoding applies the same rules in reverse to restore the original text.