Why do signed documents increase in size?

When a document has a digital seal, the size increases, since we add a chain of digital certificates.

This is done mostly because when you open a PDF with Adobe Reader, the entire certificate is validated through the Internet. But in case you don't have a connection, the validation is done using a chain of digital certificates that are added to the PDF (and makes the document increase in size).

 

In sum:

If the document contains a chain of certificates:

  • You can validate the certificate even when there is no internet connection.
  • The document will increase in size.

 

If the document does not have a chain:

  • You can only validate the certificate when you are connected to the internet.
  • The document will increase only a little in size.
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