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Bacon Cipher

Encode or decode the Bacon cipher with five symbol groups in two alphabet variants.

Bacon cipher encode and decode

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Each letter becomes a block of five symbols, and only letters can be encoded.

How to use the Bacon Cipher

  1. Paste the text you want to encode or the groups to decode.
  2. Choose the direction, the alphabet variant and the symbols.
  3. Copy the result with the Copy button.

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Frequently Asked Questions

Common questions about the free online bacon cipher.

It hides a message by replacing each letter with a group of five symbols, either A or B, following the table that Francis Bacon published in 1605.
The 24 letter variant merges I with J and U with V, as in the original table, while the 26 letter variant gives every letter its own group.
Switch to decode, paste the groups of five symbols and the text appears. Pipes, blank lines and spaces are all treated as word breaks.
You can show the groups as A and B, as lower case a and b, or as 0 and 1. The decoder understands all three forms at the same time.
Yes. With word breaks enabled a pipe marks the gap between words, and the decoder turns that pipe back into a space for you.
They have no place in the Bacon alphabet, so they are skipped while encoding and counted in the stat line for you to check.
No. It is a historical steganography trick rather than modern encryption, so do not use it to protect passwords or private data.
Yes. Switch the direction to decode and paste the groups again, or clear the box and paste the output of the encode step.
No. Both encoding and decoding happen locally in your browser and nothing you type is ever sent to a server.

Last updated: October 10, 2026