PDF knowledge

Find articles that provide you with practical insight into the world of PDFs. Learn all the ins and outs of PDFs, from the fundamentals to the best practices.

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Digital signatures in PDF/A

Digital signatures are still not very widely used and the the knowledge about them is often fuzzy. This article tries to give an overview about this huge and complex topic.

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Font subsetting - how it works and when to use

In order to reduce the file size PDF producers use a technique called font subsetting. What does exactly happen with the fonts and what are the consequences?

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Image detection in scanned images

Detecting pictures in scanned document pages has many advantages such as better compression rates and the possibility to extract them individually.

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How to convert signed documents to PDF/A?

I often get the question whether it is possible to convert digitally signed documents to PDF/A. Because there's no short answer to this I thought it would be helpful to explore the topic a bit into more detail. What tec ...

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Digging for information by extracting data from a PDF document

Extracting text from a PDF document is one of the most popular information retrieval function. But how about other information such as images, metadata and more? It can be simple - but also tricky.

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The caveats of assembling PDF/A documents

Assembling PDF documents from various sources is a crucial part of an output management system. And, as the document needs to be archived in most cases, it should conform to the PDF/A standard. But, is there a way to ass ...

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The versatility of a PDF viewer

Almost every user knows: a PDF viewer is not just a display tool for a well known document format. It provides many more functions, runs on many platforms, offers interfaces in many technologies and serves as an importan ...

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How to deal with poor PDF quality

"Quality is remembered long after the price is forgotten", says a Gucci family slogan. Nevertheless, creators of PDF documents, private users up to large companies, regularly produce files with insufficient quality causi ...

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Importing images into a PDF file - a seemingly trivial task

A picture is worth a thousand words. That's why they are fondly embedded in PDF files. One would expect that embedding images in a PDF file is a simple task. Because it seems so easy, there are also many, including free, ...

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Does OCR make sense for digitally generated PDFs?

Scanned PDF files usually consist of one raster image for each page. The OCR engine can recognize the text in this image and make the document searchable. But what about digitally generated documents?

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The Advantages of PDF/A-3 in Practice

PDF is a widely used digital document format for secure and easy access to documents. The latest version of the format, PDF/A-3, offers the added benefit of being able to store and archive files of any format, including ...

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Electronic Signatures – A Crash Course

What is a reliable way to digitally sign documents? In this article, we'll explain the differences between electronic signatures and digital signatures, explore the types of signatures used in practice, and discuss the b ...

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