Convert letters to their alphabetical position numbers (A=1, B=2, etc.) and vice versa. Perfect for simple ciphers, puzzles, and teaching the alphabet.
Last updated: March 2026 | By Patchworkr Team
Letter-to-number conversion is a simple substitution cipher where each letter of the alphabet is replaced by its position number. A=1, B=2, C=3, and so on through Z=26. This creates a basic form of encoding that's reversible and easy to understand.
This type of conversion is commonly used in puzzle books, escape rooms, educational settings, simple cryptography exercises, and children's games. It's one of the most fundamental encoding schemes and serves as an introduction to more complex ciphers like Caesar ciphers or substitution ciphers.
While not secure for actual encryption (it's easily decoded), letter-number conversion is perfect for teaching basic coding concepts, creating fun puzzles, understanding alphabetical order, and demonstrating the relationship between letters and numerical values. It's also used in various numbering systems and reference codes.
No, this is NOT secure encryption. It's a simple substitution that anyone can decode. For actual security, use proper encryption like AES, RSA, or other cryptographic algorithms. This is only for puzzles and learning.
Both uppercase and lowercase letters are converted to the same number. 'A' and 'a' both equal 1. The tool automatically converts input to uppercase for consistency.
When converting letters to numbers, spaces in your text are preserved in the output. When converting numbers to letters, use spaces to separate each number (e.g., '8 5 12 12 15').
Special characters (punctuation, symbols) are preserved as-is when converting letters to numbers. When converting numbers to letters, only numbers 1-26 are converted; everything else stays unchanged.
Absolutely! This tool is perfect for Scrabble calculations, crossword puzzle clues, creating codes for escape rooms, educational alphabet games, or any activity involving letter positions.
Simple letter-to-number substitution is one of the oldest encoding methods, dating back thousands of years. It's often a first step in learning about cryptography and ciphers before moving to more complex systems like Caesar or Vigenère ciphers.
Just type your message normally. For letters to numbers: 'HELLO WORLD' becomes '8 5 12 12 15 23 15 18 12 4'. For numbers to letters, separate each number with a space.
ASCII assigns numbers to all characters (A=65, etc.). This tool uses simple alphabetical position (A=1, B=2...Z=26), which is easier for humans to work with and commonly used in puzzles and games.
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