BYTETOOLS

Letter to Number Converter (A1Z26)

Convert letters to numbers and back with the A1Z26 cipher: A=1 through Z=26. Custom separators, instant decoding — great for puzzles and escape rooms.

What is the Letter to Number Converter (A1Z26)?

The Letter to Number Converter implements the A1Z26 cipher, where each letter is replaced by its position in the alphabet: A=1, B=2 … Z=26.

  • Standard A1Z26 mapping: A=1 … Z=26
  • Encode and decode in one tool
  • Custom separator between numbers
  • Non-letter characters pass through unchanged
  • Instant, offline and free

How to use the Letter to Number Converter (A1Z26)

  1. 1

    Pick the direction: letters to numbers, or numbers to letters.

  2. 2

    Choose the separator placed between numbers (dash, space, comma or custom).

  3. 3

    Type or paste your message.

  4. 4

    Copy the encoded or decoded result.

About the Letter to Number Converter (A1Z26)

The Letter to Number Converter implements the A1Z26 cipher, where each letter is replaced by its position in the alphabet: A=1, B=2 … Z=26. It works in both directions — type text to get numbers, or paste numbers to decode them back into letters — with a separator you choose between numbers.

A1Z26 is one of the most common codes in puzzle hunts, escape rooms, geocaching mysteries and classroom cipher exercises, and this tool is built exactly for those uses. Words stay separated, non-letter characters pass through untouched, and decoding tolerates dashes, spaces or commas between the numbers.

Everything is converted instantly and 100% locally in your browser — no uploads, no network, and it keeps working offline.

Frequently asked questions

What is the A1Z26 cipher?

It is a simple substitution code where each letter becomes its alphabet position: A=1, B=2, up to Z=26. The name literally spells the rule — A is 1, Z is 26. It appears constantly in puzzles, escape rooms and geocaching.

How do I decode numbers like 8-5-12-12-15?

Switch to decode mode and paste them in. Each number from 1 to 26 maps back to a letter, so 8-5-12-12-15 becomes HELLO. The decoder accepts dashes, spaces or commas between numbers.

Is A1Z26 case-sensitive?

No — A and a both encode to 1. When decoding you can choose whether the output letters come back as uppercase or lowercase.

Is A1Z26 secure for real secrets?

Not at all. It is a learning and puzzle cipher that anyone can reverse in seconds. Use proper encryption for anything that actually needs to stay private.

What happens to punctuation and digits in my message?

They pass through unchanged, so “hi!” encodes to 8-9! — only the letters A–Z are converted. That keeps decoded puzzle answers readable.

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