Combining PDFs in a Ruby on Rails application

When creating PDFs you might need to combine different PDFs into one larger file, for example if you want to add a cover page to a PDF report you are generating, or if you want to add your general terms to an invoice PDF you are sending via your application.CombinePDF is a pure Ruby solution to parse PDF files and combine (merge) them with other PDF files, watermark them or stamp them.Combining PDFs, for example an invoice and terms and conditions, is pretty straight-forward:.