Beaufort Cipher — Free Online Tool

Encrypt and decrypt with the reciprocal Beaufort cipher using a keyword. Beaufort Cipher is a free online tool from the ToolsRift Text Encoding Tools collection. It runs entirely in your browser — nothing to install, no signup, and your data never leaves your device.

Loading Beaufort Cipher…

How to use Beaufort Cipher

  1. Open the Beaufort Cipher above — it loads instantly, no account needed.
  2. Enter or upload your input. Everything is processed locally on your device.
  3. Get your result immediately and copy or download it with one click.

Frequently asked questions

How does the Beaufort cipher differ from Vigenère?

Beaufort computes each ciphertext letter as C = (K − P) mod 26 instead of Vigenère's (P + K). This makes it reciprocal: applying the same keyword again decrypts the message.

What can I use as a key?

Any keyword made of letters. It is repeated across the message; only alphabetic characters are enciphered, and non-letters pass through unchanged.

Do I need a separate decrypt mode?

Not really — because Beaufort is reciprocal, encrypting the ciphertext with the same key restores the plaintext. The mode toggle is provided for clarity.

More Text Encoding Tools

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 Tools