There isn't an easy way to check if a PDF contains compressed elements or not. There is not a PDF wide compression option, instead various different objects and streams in PDF files can be compressed individually, using different ...

When you use the SignFile function to add a digital signature to a PDF it adds an invisible digital signature which is not shown on any of the pages in the document. Instead the digital signature can be viewed by opening the PDF i...

The SignFile function in Foxit Quick PDF Library lets you sign PDF files using the PKCS#12 format (containing a certificate and private key). But sometimes more advanced signing options are required. This is why we've added t...

After signing a PDF file and then opening it in Adobe Reader or Adobe Acrobat the following message may be shown just below the toolbar:   This message does not indicate that the digital signature is invalid or corrupt. Inst...

There are two main reasons Adobe Reader and Adobe Acrobat will prompt you to save changes to a file after opening it. The PDF was in some way corrupt and Adobe Reader / Adobe Acrobat automatically repaired it without showing you ...

As well as enabling you to generate form fields and fill form fields, Foxit Quick PDF Library makes it easy to extract form field data or information about form fields from PDF files. In the sample code below we demonstrate how to...

A form field must have an appearance stream associated with it in the PDF in order for the form field to be visible when the PDF is viewed or printed. Appearance streams control the appearance of widget annotations and allow them ...

Creating PDF forms programmatically is easy with Foxit Quick PDF Library. In the sample code below we show you how to create text, checkbox and radio button form fields. A list of all form field functions available in our PDF SDK ...

If you're experiencing issues with text not appearing correctly or in the right location on the page after using a function such as DrawText then calling the NormalizePage function may resolve this issue for you. When you create a...