Hello, welcome back to the Ruby Advent Calendar 2017. Let’s continue the series on Day 9 with hexapdf - Read and write PDF documents; start from zero or merge, extract, optimize and much more. Incl. many examples to get you started. If you work with PDFs give hexapdf - a versatile portable document format (PDF) creation and manipulation library and command line tool - a try. Cheers. PS: You’re more than welcome to send in your articles (about your library / gem of choice) too!