You are viewing an archived version of cryptii

cryptii v2 was published in 2013 and is no longer being maintained. Beware that it may produce wrong results. Visit to use the latest version of the app or try out the new experience at

cryptii Caesar Cipher to Vigenère Cipher v2

Convert, encode, encrypt, decode and decrypt your content online

cryptii is an OpenSource web application under the MIT license where you can encode and decode between different format systems. This happens fully in your browser using JavaScript, no content will be sent to any kind of server. Please note that the encryption methods offered below are very basic and therefore not considered as secure.