How does the A1Z26 cipher work?

Each letter is replaced by its position in the alphabet: A=1, B=2, through to Z=26. Letters within a word are joined by hyphens and words are separated by spaces.

How do I format text to decode?

Put hyphens between the numbers of a single word and spaces between words — for example, 7-5-18-1 decodes to "gera". Numbers outside 1–26 are passed through unchanged.

No — the conversion runs entirely in your browser and nothing is sent to a server.

A1Z26 Cipher Encoder & Decoder

Convert letters to their alphabet position — A=1, Z=26.

A1Z26 cipher encoder and decoder

The A1Z26 cipher replaces each letter with its position in the alphabet — A=1, B=2, all the way to Z=26. Letters inside a word are joined with hyphens and words are separated by spaces, so 7-5-18-1 decodes back to “gera”.

Choose encode or decode, type your text, and the result appears instantly — all in your browser.