Baconian Cipher Encoder & Decoder
Francis Bacon's five-bit steganographic alphabet.
About this tool
Bacon's cipher encodes each letter as five A/B symbols — binary, three centuries before computing. Its real purpose was steganography: the A/B distinction can hide in two typefaces, letter cases, or any binary property of an innocent covering text.
Like everything on encrypt.tools, this runs entirely in your browser — nothing you enter is transmitted or stored.
Frequently asked questions about Baconian Cipher
What is the Baconian cipher?+
Francis Bacon's 1605 scheme encodes each letter as five A/B symbols — effectively binary, centuries before computers.
How is it used for steganography?+
The A/B distinction can be hidden in any binary property of an innocent-looking text — two typefaces, uppercase vs lowercase, or bold vs regular — concealing that a message exists at all.
How do I decode it?+
Enter the A/B groups (five per letter), with a slash between words. The tool maps each group back to a letter.
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