MuPDF

gem install mupdf

This project requires mutool be installed on your system. To verify ensure the following works:

mutool

To install mutool on MacOS use:

brew install mupdf

To install mutool on Ubuntu use:

apt-get install mupdf

A MuPDF::Document wraps a PDF file:

document = MuPDF::Document.new('./file.pdf')

The info command displays information about the document such as the number of pages:

info = document.info
info.pages # e.g. 2

The pages command finds sizing information about the pages within a document:

pages = document.pages
pages.count # e.g. 2
pages.each do |page|
  page.number # e.g. 1, 2, ...
  page.width # 612
  page.height # 792
end

The draw command is useful for converting a document between formats:

document.pages.each do |page|
  document.draw(page: page.number, format: "png", path: "./file-#{page.number}.png")
end