Is Base64 encoded PDF?

This way the PDF file gets send, not its base64 encoding . PDF files contain typically binary data. In XSLT only http://www.w3.org/TR/REC-xml/ s can be processed. This is the reason why you cannot have the PDF file itself in XLST, only its base64 encoding.

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Can you decode Base64?

Base64 is an encoding, the strings you’ve posted are encoded. You can DECODE the base64 values into bytes (so just a sequence of bits). And from there, you need to know what these bytes represent and what original encoding they were represented in, if you wish to convert them again to a legible format.

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