What is the A1Z26 cipher?

A simple substitution cipher where each letter is replaced by its position in the alphabet: A=1, B=2, ... Z=26.

How are word boundaries handled?

Each line's words are encoded separately and shown space-separated; non-letter characters are dropped from the encoded output.

Is my text sent to your servers?

No. Encoding and decoding both run entirely in your browser.

A1Z26 Cipher Decoder

Encode text into A1Z26 cipher numbers, or decode numbers back to letters — pick a separator and swap direction instantly.

Processed locally in your browser — nothing is sent to a server.

Mode

Separator

Text input

1 lines11 charsValid

Output

8 5 12 12 15 / 23 15 18 12 4

1 lines28 charsValid

About this tool

Encode letters to their 1-26 alphabet position, or decode a sequence of numbers back to text. Choose how the numbers within each word are separated, and use the swap button to switch direction.

Frequently asked questions

What is the A1Z26 cipher?: A simple substitution cipher where each letter is replaced by its position in the alphabet: A=1, B=2, ... Z=26.
How are word boundaries handled?: Each line's words are encoded separately and shown space-separated; non-letter characters are dropped from the encoded output.
Is my text sent to your servers?: No. Encoding and decoding both run entirely in your browser.

Privacy

Every conversion runs in your browser. Nothing you paste here is sent to WebCodeIn’s servers, logged, or stored.

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