Here are some answers to frequently asked questions.

Do not hesitate to contact us via the contact form in case of difficulty.

macOS Sierra

Apple modified the "PdfKit" API with Mac OS 10.12, mac Sierra.

Last update, 10.12.2, fixed some difficulties, but many bugs remain and it is still impossible for the moment to operate correctly PdfStamper on this version of the system.

Let's hope that Apple corrects all this quickly!

How do I get a license?

Just click on the "Store" link on this site or Purchase from PdfStamper.

ES Window

Once your purchase is complete, you will receive an invoice that contains a serial number that will allow you to activate the software.

You can then use all the features of

What is product activation?

Software activation is the proof of your purchase.
You can activate the software on only one machine at a time.

The inserted picture into my stamp is black or invisible

Check your settings in the Stamps Library !

There is a safe bet that you have applied a transparency on an image that is already transparent.

Transparent stamp

Uncheck the "Transparent" box, your image should appear normally.

I want to install on another machine, what should I do?

Before anything else, you must disable your serial number on your old computer.

PdfStamper licence is required for each computer you want to use.


There is no need to uninstall PdfStamper from your computer.

Then, download the software on your new computer, and simply activate it on your new machine, with the name and serial number you received with your purchase invoice.

My document did not print or could not be saved properly.

Pdf documents are complex and can be generated in many different ways. It is always possible to find an evil formatted or misinterpreted document.

Send us the document for analysis via our contact form.