Convert letters to their position in the alphabet (A=1, B=2 … Z=26) and back. A common beginner and puzzle cipher.
It simply replaces each letter with its position in the alphabet: A is 1, B is 2, up to Z is 26. It is one of the first ciphers people learn and is common in escape rooms and puzzle hunts.
Letters within a word are joined by hyphens and words are separated by spaces, so HELLO WORLD becomes 8-5-12-12-15 23-15-18-12-4. That keeps word boundaries clear when decoding.
No. It is a direct, fixed substitution with no key, so anyone can decode it instantly. It is for fun, learning and puzzles, not security.