Important: To distinguish between encoding and decoding it is important to have the keyboard focus on the data to be converted (for encoding focus must be in the upper text box and for decoding in the bottom one).
Encoding tutorial: choose desired output type (bottom combo box) and write input data in the upper text box (Encoding doesn't require choosing input data type). When the upper text box has keybord focus press ENTER.
Decoding tutorial: choose input data type (bottom combo box) and output data type (upper combo box). Put your input data in the bottom text box, make sure it has keyboard focus and then press ENTER.