Windows 10 Professional
WSL2 - (Ubuntu22.04 LTS)
pdftocairo version 22.02.0

wkhtmltopdf https://blog.k-bushi.com/post/tech/tips/use-qrencode/ qrencode.pdf

$ sudo apt-get install poppler-utils

$ pdftocairo
pdftocairo version 22.02.0
Copyright 2005-2022 The Poppler Developers - http://poppler.freedesktop.org
Copyright 1996-2011 Glyph & Cog, LLC
Usage: pdftocairo [options] <PDF-file> [<output-file>]
  -png                     : generate a PNG file
  -jpeg                    : generate a JPEG file
  -jpegopt <string>        : jpeg options, with format <opt1>=<val1>[,<optN>=<valN>]*
  -tiff                    : generate a TIFF file
  -tiffcompression <string>: set TIFF compression: none, packbits, jpeg, lzw, deflate
  -ps                      : generate PostScript file
  -eps                     : generate Encapsulated PostScript (EPS)
  -pdf                     : generate a PDF file
  -svg                     : generate a Scalable Vector Graphics (SVG) file
  -f <int>                 : first page to print
  -l <int>                 : last page to print
  -o                       : print only odd pages
  -e                       : print only even pages
  -singlefile              : write only the first page and do not add digits
  -r <fp>                  : resolution, in PPI (default is 150)
  -rx <fp>                 : X resolution, in PPI (default is 150)
  -ry <fp>                 : Y resolution, in PPI (default is 150)
  -scale-to <int>          : scales each page to fit within scale-to*scale-to pixel box
  -scale-to-x <int>        : scales each page horizontally to fit in scale-to-x pixels
  -scale-to-y <int>        : scales each page vertically to fit in scale-to-y pixels
  -x <int>                 : x-coordinate of the crop area top left corner
  -y <int>                 : y-coordinate of the crop area top left corner
  -W <int>                 : width of crop area in pixels (default is 0)
  -H <int>                 : height of crop area in pixels (default is 0)
  -sz <int>                : size of crop square in pixels (sets W and H)
  -cropbox                 : use the crop box rather than media box
  -mono                    : generate a monochrome image file (PNG, JPEG)
  -gray                    : generate a grayscale image file (PNG, JPEG)
  -transp                  : use a transparent background instead of white (PNG)
  -antialias <string>      : set cairo antialias option
  -icc <string>            : ICC color profile to use
  -level2                  : generate Level 2 PostScript (PS, EPS)
  -level3                  : generate Level 3 PostScript (PS, EPS)
  -origpagesizes           : conserve original page sizes (PS, PDF, SVG)
  -paper <string>          : paper size (letter, legal, A4, A3, match)
  -paperw <int>            : paper width, in points
  -paperh <int>            : paper height, in points
  -nocrop                  : don't crop pages to CropBox
  -expand                  : expand pages smaller than the paper size
  -noshrink                : don't shrink pages larger than the paper size
  -nocenter                : don't center pages smaller than the paper size
  -duplex                  : enable duplex printing
  -opw <string>            : owner password (for encrypted files)
  -upw <string>            : user password (for encrypted files)
  -q                       : don't print any messages or errors
  -v                       : print copyright and version info
  -h                       : print usage information
  -help                    : print usage information
  --help                   : print usage information
  -?                       : print usage information

Usage: pdftocairo [options] <PDF-file> [<output-file>]

pdftocairo -png qrencode.pdf qrencode.png