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A1Z26 Cipher

Encode text as A=1 to Z=26 or decode numbers back to letters, with your own separators.

Encode or decode A1Z26

A1Z26 maps A to 1 and Z to 26. Everything is converted locally in your browser.

How to use the A1Z26 Cipher

  1. Choose whether you want to encode letters or decode numbers.
  2. Pick a separator and decide whether to keep spaces and punctuation.
  3. Type your text and copy the converted result with one click.

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Frequently Asked Questions

Common questions about the free online a1z26 cipher.

A1Z26 replaces every letter with its position in the alphabet, so A becomes 1, B becomes 2 and Z becomes 26.
Switch to decode mode, paste the numbers, and pick the same separator that was used to encode the message.
A hyphen keeps numbers readable, a space looks tidier, and no separator gives the shortest but most ambiguous output.
Spaces, commas and other marks are copied through untouched, so the shape of the original sentence stays visible.
Some ciphers add a shift so numbers can exceed 26. Modulo 26 wraps those values back into the A to Z range.
Yes, but the tool then reads one or two digits at a time, so the result may be ambiguous for some sequences.
No. The whole conversion runs inside your browser, so your message never leaves your device.
Yes. The A1Z26 cipher is completely free with no account, no sign-up and no limit on how much text you convert.

Last updated: October 10, 2026