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Signing, password protection and properties

A digital signature proves who signed a document and that it has not been altered afterwards. A password determines who may open it.

Digital signing

  1. Click Sign → Sign and draw a rectangle for the visible signature field. For no visible field: Sign invisibly.
  2. Select your digital ID: from the Windows certificate store (also smart card or USB token) or a .pfx file protected by a password.
  3. Choose the signature format: PAdES B-B, with timestamp (B-T) or for long-term validation (B-LT, B-LTA).
  4. Choose where the signed document will be saved.

Certifying defines with the first signature which changes are allowed afterwards. Create a separate ID for internal use with Create digital ID.

Verify signatures

On open, netPDF checks existing signatures and displays the result in the status bar. Verify signatures creates a detailed report with the certificate chain, revocation status, timestamp and subsequent modifications. Load EU trust list also recognises qualified signatures from other member states.

Set password

  1. Click Document → Set password.
  2. Enter the password to open twice.
  3. Optional: a different owner password required to change rights.
  4. Select the rights: All rights, Read and print or Read only.
  5. Save the document. netPDF encrypts using AES-256.

To remove protection, open the document with the password, click Remove password and save it.

Properties and attachments

In the Properties side panel you change title, author, subject and keywords and view PDF version, page count, PDF/A designation and encryption. Add attachment embeds any file into the PDF; in the Attachments side panel you can save it out again or remove it.