Loading…

How to use A1Z26 Cipher

Type your text, and the tool converts each letter to its position number (A=1, Z=26) — paste numbers in decode mode to convert them back to letters.

Frequently asked questions

What is the A1Z26 cipher?

A1Z26 is a simple substitution cipher that replaces each letter with its position in the alphabet: A=1, B=2, up to Z=26. Numbers are joined by a separator such as a dash or space.

How are words separated when decoding?

Spaces between number groups act as word breaks. The tool preserves word boundaries so decoded output keeps the original spacing between words.

Is A1Z26 case-sensitive?

No — encoding is case-insensitive since both 'A' and 'a' map to 1. Decoded output is returned in lowercase letters.

More Text Encoding Tools

Rail Fence Cipher
Encrypt and decrypt text with the zigzag rail fence transposition cipher (2-10 rails)
Bacon Cipher
Encode text into Baconian a/b groups of five and decode Bacon cipher back to text
Affine Cipher
Encrypt and decrypt with the affine cipher using multiplier and shift keys (a coprime to 26)
Polybius Square Cipher
Convert letters to row-column number pairs with the 5×5 Polybius square (I/J shared)
Tap Code Translator
Encode text as prisoner tap-code row,column taps and decode taps back to letters (K→C)
Beaufort Cipher
Encrypt and decrypt with the reciprocal Beaufort cipher using a keyword
Gronsfeld Cipher
Encrypt and decrypt with the Gronsfeld cipher using a numeric digit key
Vigenère Cipher
Encrypt and decrypt text with the classic Vigenère polyalphabetic cipher using a keyword
Autokey Vigenère Cipher
Encrypt and decrypt with the autokey cipher where the plaintext extends the keyword stream
Playfair Cipher
Encrypt and decrypt with the Playfair digraph cipher using a 5×5 keyword square (I/J merged)
Columnar Transposition Cipher
Encrypt and decrypt with keyword columnar transposition. Columns are read in alphabetical key order
Scytale Cipher
Encrypt and decrypt with the ancient Spartan scytale rod transposition cipher. Round-trip guaranteed

← View all Text Encoding ToolsBrowse all 1,100+ tools →