Letter to Number Converter
Convert letters to numbers and numbers to letters using A1Z26 encoding. Transform text like HELLO to 8-5-12-12-15 or numbers back to letters. Perfect for encoding messages, puzzles, games, and educational activities with customizable delimiters.
Complete Guide: Letter to Number Converter
Everything you need to know about using this tool effectively
The Letter to Number Converter transforms each letter in your text to its position in the alphabet using the A1Z26 system. A becomes 1, B becomes 2, and Z becomes 26. Non-letter characters like spaces and punctuation are preserved in the output. You choose the delimiter between numbers (space, comma, hyphen, colon, or semicolon). All processing happens in the browser.
This tool maps every alphabetic character to its numeric position in the English alphabet. It is case-insensitive, so both 'a' and 'A' convert to 1. Non-alphabetic characters pass through unchanged. The delimiter option controls how numbers are separated in the output. The tool reports statistics including input length, output length, and item count.
Creating coded messages for puzzles
Encode a message like 'HELLO' into '8 5 12 12 15' for escape rooms, scavenger hunts, or brain teasers.
Teaching alphabet positions to children
Show students how each letter maps to a number to reinforce alphabet sequencing.
Generating unique identifiers
Convert a word or name into a numeric code for use as a simple identifier or label.
Learning basic encoding
Use as an introduction to substitution ciphers and classical cryptography concepts.
Enter your text
Type or paste letters into the input area. Case does not matter.
Choose a delimiter
Select how numbers should be separated in the output: space, comma, hyphen, colon, or semicolon.
Convert
Click Convert. The tool maps each letter to its number and displays the result.
Copy the result
Copy the encoded text or download it as a file.
Use the same delimiter for encoding and decoding to avoid confusion.
Non-letter characters (spaces, punctuation, numbers) are preserved as-is in the output.
Hyphen delimiter is popular for puzzle creation: 8-5-12-12-15.
Pair this with a number-to-letter converter for bidirectional encoding.
What is A1Z26 encoding?
A1Z26 is a simple substitution cipher where each letter is replaced by its position in the alphabet. A=1, B=2, and so on through Z=26. It is commonly used in puzzles and educational activities.
Are uppercase and lowercase treated differently?
No. Both 'a' and 'A' convert to 1. The tool is case-insensitive and outputs only numbers.
What happens to spaces and punctuation?
Non-letter characters are preserved in the output exactly as entered. For example, 'HELLO!' with a space delimiter becomes '8 5 12 12 15 !'.
Can I convert numbers back to letters?
This tool only converts letters to numbers. Use a number-to-letter converter for the reverse operation.
Is my text uploaded anywhere?
No. All conversion happens in your browser using JavaScript. The text never leaves your device.