The calculator for URL decoding, also known as unescaping, takes a URL-encoded string and converts it back to its original form.

This online calculator can decode message written with standard galactic alphabet symbols

This online calculator tries to decode Vigenère cipher without knowing the key. It uses the index of coincidence technique.

This online calculator tries to decode substitution cipher without knowing the key. It uses genetic algorithm over text fitness function to break the encoded text. Note that you may need to run it several times to find completely accurate solution. The calculator logic is explained below the calculator.

This online calculator performs Kasiski examination of an entered text using trigrams in attempt to discover a key length

This online calculator provides aid in finding Vigenère cipher key if you can guess part of the encrypted text. It just automates some routine calculations, which you would perform manually otherwise.