Encrypt and decrypt with keyword columnar transposition. Columns are read in alphabetical key order. Columnar Transposition 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 message is written in rows beneath a keyword. Columns are then read off in the alphabetical order of the keyword letters to form the ciphertext. It rearranges letters rather than substituting them.
Each keyword letter is ranked alphabetically (ties broken left to right). For example 'ZEBRAS' ranks its columns 6-3-2-4-1-5, so column A is read first, then B, then E, and so on.
Yes. The tool recomputes each column's length from the message length and keyword, so decoding with the same keyword returns your exact original letters. Encrypting 'WEAREDISCOVEREDFLEEATONCE' with 'ZEBRAS' gives 'EVLNACDTESEAROFODEECWIREE'.