Encode text into Baconian a/b groups of five and decode Bacon cipher back to text. Bacon 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.
The Baconian cipher, devised by Francis Bacon in 1605, is a steganographic cipher that encodes each letter as a group of five characters using only two symbols (here 'a' and 'b'), like a 5-bit binary code.
The modern 26-letter version, where every letter gets its own distinct code (A=aaaaa … Z=bbaab). The original 24-letter version merged I/J and U/V; this tool avoids that ambiguity for a perfect round-trip.
Paste the a/b groups (spaces optional) into decode mode. Any characters that are not 'a' or 'b' are ignored, and every group of five is converted back to a letter.