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Letter to Number Converter

CryptographyDecryptEducationEncryptionText

Convert letters to numbers and vice versa with our Letter to Number Converter. Simple A1Z26 cipher tool for creating codes, puzzles, and educational activities.

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INPUT

Auto Process

OUTPUT

Client Side

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Guide

What is a Letter to Number Converter?

IO Tools’ Letter to Number Converter is a tool that transforms alphabetic characters into their corresponding numeric values based on the A1Z26 cipher system. This conversion assigns numbers to letters according to their position in the alphabet (A=1, B=2, C=3, through Z=26).

Key Features

Feature	Description
Bidirectional Conversion	Convert text to numbers or numbers back to text
Multiple Output Formats	Choose between space-separated, comma-separated, or custom delimiters
Batch Processing	Process multiple lines of text simultaneously
Case Insensitivity	Handles both uppercase and lowercase letters identically

Use Cases

Cryptography: Create simple substitution ciphers for educational purposes
Puzzle Creation: Design number-based word puzzles and riddles
Data Encoding: Transform text data into numeric format for specific applications
Educational Tools: Help students learn about basic encryption methods and alphabetic order

How to Use

Enter your text in the input field
Select a conversion type from the dropdown (A=1, B=2, C=3, ASCII, etc.)
Choose conversion direction (Text to Numbers or Numbers to Text)
Select your preferred output format (Space separated, Comma separated, etc.)
Copy the output with the copy button

Available Conversion Types

A=1, B=2, C=3, … – Standard A1Z26 cipher (default)
A=0, B=1, C=2, … – Zero-indexed alphabet conversion
ASCII – Converts to ASCII decimal values
Hex ASCII – Converts to ASCII hexadecimal values
Binary ASCII – Converts to ASCII binary representation
Tap Code / Knock Code – Uses the tap/knock code grid system

 FAQ

What is the A1Z26 cipher?

The A1Z26 cipher is a simple substitution cipher that replaces each letter with its numerical position in the alphabet. For example, A=1, B=2, C=3, and so on through Z=26. It's one of the most basic forms of encryption and is often used in puzzles and educational contexts.
Can I convert numbers back to letters?

Yes, the Letter to Number Converter works both ways. Simply select the "Numbers to Text" option in the direction dropdown menu, enter your numbers (separated by spaces or commas), and the tool will convert them back to letters.
Why are some characters not converting?

Only alphabetic characters (A-Z, a-z) are converted to numbers. Special characters, punctuation, and spaces remain unchanged or are ignored in the output, depending on your settings. Numbers in the input text will also remain unchanged when converting from text to numbers.
How can I separate the numbers in a different way?

You can choose different output formats from the dropdown menu, including space-separated, comma-separated, or other custom separators. This gives you flexibility in how you want your converted output to be formatted.
Can I use this tool for creating coded messages?

While the Letter to Number Converter can be used to create simple coded messages, the A1Z26 cipher is very basic and easy to decode. For more secure communications, you should consider using more complex encryption methods. This tool is best used for educational purposes, puzzles, or recreational activities.