A1Z26 Cipher & Number Substitution Tool

Convert text to numbers and numbers back to text instantly with the A1Z26 letter-number substitution converter, custom separators, and error handling.

Deep-Dive Educational Guide

A1Z26 Cipher & Numerical Encoding: The Mathematics of Coordinate Indexing & Prefix-Free Codes

An exhaustive academy guide to A1Z26: the vital distinction between encoding and encryption, the mathematical proof of delimiter necessity, prefix-free Kraft inequality analysis, algebraic layering in Affine/Hill ciphers, and dynamic programming ambiguity solvers in Python.

Read Companion Guide →

How to Use A1Z26 Cipher & Number Substitution Tool

  1. Select Conversion Direction: Choose Text-to-Numbers (encryption) or Numbers-to-Text (decryption).
  2. Choose Number Separator: Select whether numbers are separated by hyphens (e.g. 3-9-16-8-5-18), spaces, or commas.
  3. Inspect Letter-Number Values: View the instant conversion where A=1, B=2, C=3, up to Z=26.

Frequently Asked Questions

What is the A1Z26 cipher?

A1Z26 is a direct number substitution cipher where each alphabet letter is replaced by its 1-indexed position in the alphabet (A=1, Z=26).

Is A1Z26 considered secure?

No. A1Z26 provides no cryptographic security and is purely a numerical encoding scheme used in puzzles, geocaching, and ARG games.