PDF versions
Does the PDF version actually matter?
A key finding of recent research: at least 20% of PDF files on the web have an “invalid” PDF version!
However, as our experience with everyday PDF files appears to be unhampered by these inaccurate version numbers the answer to the question, generally speaking, is “no”.
One important explanation for why the file’s stated version number lacks relevance is that most PDF features are designed to be backward-compatible. There is no need for general PDF software to fail on a document or warn users when it encounters a minor mis-versioned feature – either the software is coded to understand the feature or it ignores the effectively unknown feature(s) that it doesn’t understand. This is today’s experience with most PDF software.
Tagged PDF Q & A
Authoritative answers to common questions about Tagged PDF, WTPDF and PDF/UA.
March 2024 by Peter Wyatt (PDF Association)
Peter Wyatt shares his custom metadata panels – very useful for discovering ISO standards and PDF Declarations metadata! (until vendors … Read more
March 2024 by PDF Association staff (PDF Association)
The PDF Association has established a new Liaison Working Group (LWG) to serve as a place for forensics experts and … Read more
February 2024 by PDF Association staff (PDF Association)
All PDF Association Full and Liaison Members who have joined Technical and/or Liaison Working Groups are welcome for two weeks … Read more