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Adding Digital Signatures to Existing PDF's

Existing PDF documents are managed by PentaPDF Editor.

To digitally sign or countersign an existing PDF document do the following:

  1. Open the PDF file you wish to sign in PentaPDF Editor.
  1. Right-click on the preview area and select Sign from the context menu OR choose Sign from the Sign menu.

    This will open the PentaPDF Options Screen with the Signature Tab already opened. It is here where you'll select the Digital Signature you wish to use and set all other options related to digital signing. See also the PentaPDF Editor Tutorial for Digitally Signing PDFs using PentaPDF Editor to learn more about this screen.
  1. Fill in the Signature Tab according to your needs and click the OK button.

The next step(s) will depend on whether you chose to sign your document using a) an invisible or b) a visible signature:

a) Using an invisible Signature:

  1. If you have decided to sign your PDF document with a signature that won't be visible in the document, all that's left to do is  to save and close the document. The PDF document will be saved with its invisible signature and the document will be verifiable based on this Digital Signature. There will be no gaphical reference on the PDF page or pages but the Digital Signature will be present and inidicated by the Security flag "Show Signature" when viewing the PDF, e. g. using Adobe Reader.

b) Using a visible Signature:

If you have chosen to add a visible signature to your PDF document, you'll be prompted by a message to indicate in the Editor program where you want the image of your digital signature to appear in the document:

  1. In the preview area select the page and the position where you want the digital signature to be applied:
  • You can use the page navigation buttons or the page thumbnails on the Pages tab to go to the desired page.
  • The Hand tool as well as the scroll buttons can be used to move the currently viewed page around in order to choose the location for the digital signature place holder.
  • If needed, you can make the document larger using the zoom features.
  1. Once you have selected the page and position you want the Digital Signature to be placed, draw the Digital Signature Place Holder:
  • position the cursor where you want the signature image to start
  • press the left mouse button
  • drag your mouse and a dotted line place holder will appear in that area:

As soon as the signature rectangle is drawn, the Preview Screen showing what the digital signature will look like becomes available.

  1. Press the Sign button to save the signed PDF document. The following image shows how a visible digital signature will appear when viewing the digitally signed document using Adobe Acrobat Reader:

Check out the Animated Tutorials for PDF Editing.

Additional Information

Digital Signatures

Creating New Digitally Signed PDF's

What is a Digital Certificate?

Definition of Root Certificate

X.509 Certificates

Where to get a Digital Certificate

Requesting Digital Certificates through Internet Explorer

How to Export a PFX File from Internet Explorer

Requesting Digital Certificates through Firefox

How to Import an Internet Explorer PFX File to Firefox

How to Export a PFX File from Firefox

Adobe Acrobat and Digitally Signed PDF Files

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