Converting Hex to Base64 with notepad++

The trick was that by converting the HEX directly in notepad++, It's taken as a ASCII value not as A HEX Value as intended.

So we need to converted first the HEX --> ASCII then ASCII --> BASE64

1/ Select the string

2/ Using Notepad++ menu: Plugins -> Converter -> HEX -> ASCII

3/ Plugins -> MIME Tools -> Base64 Encode

and we get the needed value

The characters FB can be encoded as the 16-bit values 46004200 and encoding that in Base 64 gives RkI=.

Using Notepad++ menu => TextFx => TextFx Tools => Base 64 decode:

• Converting +w== gives the single byte xFB. It show as thouse three characters in white on a black background. The status bar at the bottom of the window shows the buffer has a length of 1 (i.e. one).
• Converting RkI= gives the two characters FB. Shown in black on a white background, i.e. as normal text. The buffer is shown to have a length of 2.

Conclusion, your initial conversion was of the two charactgers FB not the byte with value hex-FB.