There's another possible complication beyond those enumerated in the excellent Re: Convert PDF file into HTML file.
Some .pdf are created by scanning text_on_paper 1
. The intermediate is an image, not unlike a .png, .jpg or .bmp. The resultant .pdf contains a picture
of the text, not the ASCII or UTF or Kanji characters, per se
And that, TTBOMK, leaves only the OCR option for retrieving the text as text.
Update: Addition below, for clarity:
1. This is typical, for example, of low-cost home "MFC" and "all-in-one" printer-scanner-copiers and of offices with limited, low-level IT knowledge and support and is effected by use of the multi-function copiers now commonly replacing single-purpose Xerograpic copiers.
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