Playfair cipher encoder
Playfair cipher with 5×5 key square (I and J merged). Encryption inserts X between duplicate-letter digrams and pads odd-length text with X; decryption does not auto-strip those Xs — review the output manually.
About this tool
Playfair cipher encoder is a single-purpose utility on instant.tw, a free toolbox of calculators, converters, generators, and quick lookups. Everything works in your browser — nothing is uploaded, nothing is stored on a server unless explicitly noted.
Category: Encoding & Conversion. Browse more Encoding & Conversion tools.