Portable Document Format (PDF) is a file format used to present documents in a manner independent of application software, hardware, and operating systems. The Specification refers to the specification that it needs to meet.

PDF file specification

Who decides what is in the PDF file specification?

This used to be a really easy question to answer – Adobe. The PDF file format was invented by the co-founder of Adobe (John...
Mark Stephens
1 min read

Where do your PDF objects start in a PDF…

In theory this is a really easy question to answer for non-Compressed PDF files. There is a reference table to all the PDF objects...
Mark Stephens
1 min read

What are subsetted fonts in PDF files?

What are subsetted fonts? Subsetted fonts are fonts which  only include certain values. If you look at the fonts on your Computer you will...
Mark Stephens
2 min read