Validating Digital Signatures

PDF Studio Viewer validates any digital signatures upon opening a document. PDF Studio Viewer will first check that the digital signatures in the document use valid certificates and that the document has not been changed. It will then check that the certificate used to issue the digital ID in the signature was issued by a trusted certificate authority.

Validating Digital Signatures

Depending on the results of the validation, PDF Studio Viewer will display one of three icons on the signature:

The signature validated correctly, that there were no changes made to the document, and that the issuing certificate authority is trusted.


The signature validated correctly, but there might be some problems, such as the digital ID being issued by a certificate authority that is not trusted.


There were problems validating the signature. The problems can include any changes to the document after the signature was applied.

Checking Additional Validation Details

  1. Using the Hand Tool select the signature that you wish to validate.
  2. This will display a dialog showing the Signature Validation Status
  3. To view further information click on the Details button
  4. Once complete, to close the dialog, click on Close or press Esc on the keyboard



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