Free Online Tool

Playfair Cipher

Use digraph substitution with the Playfair cipher and its 5x5 letter grid.

Playfair Cipher

Standard 5x5 digraph substitution with I and J combined

Mode

Keyword

5x5 key square

PLAYFIREXMBCDGHKNOQSTUVWZ

Plaintext

Output

Standard Playfair Vector

How to Use Playfair Cipher

Enter or edit a keyword to build the 5x5 key square.
Letters are uppercased, J is merged with I, repeated letters in a pair are separated with X, and an odd final letter is padded with X.
Encode uses right shifts for a shared row, down shifts for a shared column, and opposite rectangle columns otherwise.
Use Decode with the same keyword to reverse the row and column shifts.

Keyword:

PLAYFAIR EXAMPLE

Plaintext:

HIDETHEGOLDINTHETREESTUMP

Output:

BMODZBXDNABEKUDMUIXMMOUVIF

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