What is A1Z26 decoding?

A1Z26 decoding is the reverse of A1Z26 encoding. It transforms numerical positions back into their corresponding letters (1=A, 2=B, 3=C, up to 26=Z). This decoding method is commonly used to read encoded messages, solve puzzles, and understand classical cryptographic techniques.

How do I convert numbers to letters?

Using our number to letter converter is simple: 1) Enter your numbers in the input field, separated by spaces, commas, or other delimiters, 2) Choose your preferred delimiter option, 3) Click the Convert button. The tool will instantly transform each number to its corresponding letter.

What happens to invalid numbers?

Numbers outside the valid range (1-26) are preserved as-is in the output. For example, if you enter '99', it will remain '99' in the result since there's no letter corresponding to that number. This helps you identify and fix errors in your input.

Can I convert letters to numbers too?

This tool converts numbers to letters (A1Z26 decoding). For the reverse conversion (letters to numbers), we have a separate letter to number converter tool. This separation allows for more specialized functionality and better user experience for each specific conversion direction.

What delimiter should I use?

Use the same delimiter that was used to encode the original message. Space is most common and easiest to read, but comma, hyphen, colon, or semicolon can also be used depending on the encoding format of your message.

How are multi-digit numbers handled?

Each number is decoded independently based on its value. Single-digit numbers (1-9) convert to A-I, two-digit numbers (10-26) convert to J-Z. For example: '8 5 12 12 15' converts to 'HELLO' and '20 8 5' converts to 'THE'.

Is this tool free to use?

Yes, our number to letter converter is completely free to use with no registration required. You can convert as many numbers as you like, and all features including copy to clipboard and download are available at no cost. The tool works entirely in your browser for fast, private conversions.

Is my data processed securely?

Yes, all text processing happens locally in your browser using JavaScript. Your numbers and conversions never leave your device or get transmitted to any servers, ensuring complete privacy and security for your data.

Number to Letter Converter

Convert numbers to letters using A1Z26 decoding. Transform numbers like 8-5-12-12-15 back to HELLO. Perfect for decoding messages, puzzles, games, and educational activities with customizable delimiters.

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a1z26

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Quick Presets

Common number-sequence examples

Input Numbers

Convert number sequences (1-26) back to letters (A-Z).

Number Sequence

How it works: Converts each valid number 1-26 to its matching alphabet letter. Invalid entries are preserved in output.

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