Portable Document Format (PDF) is a file format used to present documents in a manner independent of application software, hardware, and operating systems.
PDF File Format
Text is defined in the PDF file format as a display value (normally what you see onscreen) and an extraction value. It is useful... TL;DR: A PDF Xref table is an internal “map” of byte offsets that tells a reader exactly where to find specific objects (like fonts... Introduction Form XObjects (not be confused with forms which are buttons, checkboxes, buttons, etc) are an advanced feature of the PDF file format. They... White is a special color in the PDF file format. This is because of the way different colours work in the PDF file format.... This is part of a series on How to make your own PDF files. In the previous article of this series, we learn to... This is part of a series on How to make your own PDF files. Before we can start hacking together our own simple PDF... 
