Render PDF pages as PNG images
Use XPDF's pdftopng to rasterize the first page of the selected PDF at 144 DPI. Returns a generated PNG you can preview inline or download.
# PDFtoPNG - Help
Source: https://www.xpdfreader.com/download.html
```
pdftopng version 4.03 [www.xpdfreader.com]
Copyright 1996-2021 Glyph & Cog, LLC
Usage: pdftopng [options] <PDF-file> <PNG-root>
-f <int> : first page to print
-l <int> : last page to print
-r <number> : resolution, in DPI (default is 150)
-mono : generate a monochrome PNG file
-gray : generate a grayscale PNG file
-alpha : include an alpha channel in the PNG file
-rot <int> : set page rotation: 0, 90, 180, or 270
-freetype <string>: enable FreeType font rasterizer: yes, no
-aa <string> : enable font anti-aliasing: yes, no
-aaVector <string>: enable vector anti-aliasing: yes, no
-opw <string> : owner password (for encrypted files)
-upw <string> : user password (for encrypted files)
-q : don't print any messages or errors
-cfg <string> : configuration file to use in place of .xpdfrc
-v : print copyright and version info
-h : print usage information
-help : print usage information
--help : print usage information
-? : print usage information
```