A1Z26 Cipher: Translate Between Letters and Numbers A1Z26 cipher is a simple direct substitution cipher. It goes with other names like (Letters to Numbers, Numbers to Letters). It is also known as Letter-Number code. Basically, it encrypts by replacing each letter by its position in the alphabet. For example letter "A" with the digit "1", letter "B" with the digit "2" and the pattern continues. To put it simply A1Z26 replaces each letter of the alphabet by its number in the alphabet. Most of the time all letters are set to lowercase and English alphabet is used. Also all non-alphabet symbols are not changed, for example, dashes and spaces. Use the above a1z26 cipher decoder and encoder to translate between letters and numbers. If this tool was helpful, tweet it or share it.