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PDF files can include interactive forms – radio buttons, checkboxes, text boxes, lists, etc. There are interactive widgets – the user can click on...

Mark Stephens
Jan 7, 2011 40 sec read

Over the holiday I read an interesting question asking how to find numbers within a specific range on a PDF page. This set me...

Mark Stephens
Jan 3, 2011 54 sec read

I was recently sent a PDF file where some of the metadata appeared to be wrong. In particular, the PRODUCER field was appearing in...

Mark Stephens
Dec 10, 2010 1 min read

How to calculate PDF Image dpi Most elements of a PDF file are device independent Vector graphics. This means that they will always appear...

Mark Stephens
Dec 6, 2010 1 min read

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
Dec 2, 2010 1 min read

Update: You can see all these modes in action on Youtube. A PDF file is a multipage document which can contain many pages. Unlike...

Mark Stephens
Dec 1, 2010 1 min read