A1Z26 Cipher
Encode letters as numbers from 1 to 26, and decode them back.
Quick answer: enter your details below and click Encode — your result appears instantly, right here in your browser. Nothing you enter is uploaded or stored.
A
Text & Writing
Enter your details below.
How to use
- Type text or A1Z26 numbers into the box.
- Choose Encode or Decode.
- Click Encode and copy the result.
About this tool
A1Z26 Cipher replaces each letter with its position in the alphabet, so A is 1, B is 2, and Z is 26. Encoding separates letters with spaces and words with a slash, and decoding reverses the process, flagging any number outside 1 to 26.
Frequently asked questions
How are words separated when encoding?
Letters in a word are separated by spaces and words are separated by a slash, so 'hi there' encodes as '8 9 / 20 8 5 18 5'.
What happens if I enter 27 when decoding?
The tool reports it as an invalid code, since A1Z26 only defines numbers from 1 to 26.