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

What does the ActualText dictionary tag do?

Text is defined in the PDF file format as a display value (normally what you see onscreen) and an extraction value. It is useful...
Mark Stephens
29 sec read

What are PDF Xref tables?

What are PDF Xref tables? Xref tables are part of the original PDF file specification and one of the features which gives the PDF...
Mark Stephens
1 min read

What are Form XObjects?

Form XObjects (not be confused with forms which are buttons, checkboxes, buttons, etc) are an advanced feature of the PDF file format. They can...
Mark Stephens
44 sec read

Why is white a special color in PDF files?

White is a special color in the PDF file format. This is because of the way different colours work in the PDF file format....
Mark Stephens
1 min read

Make Your Own PDF – Part 2b: Create your…

In the previous article of this series, we learn to use a text editor to structure and create a PDF file.  The only problem...
2 min read