Digitally signing a PDF with your Class 3 DSC gives the document the same legal standing as a handwritten signature under the Information Technology Act, 2000. Whether you are signing a contract, a government form, or a board resolution, the process is straightforward once your USB token is set up correctly.

Method 1: Sign Using Adobe Acrobat Reader DC

Adobe Acrobat Reader DC (free) supports DSC-based signing on Windows. Follow these steps:

  • Insert your USB token and open Adobe Acrobat Reader DC
  • Open the PDF you wish to sign, click Tools → Certificates
  • Click Digitally Sign and draw a signature field on the page
  • In the Sign with a Digital ID dialog, select your DSC from the list
  • Enter your USB token PIN when prompted
  • Click Sign and save the PDF — a blue signature banner confirms validity

Ensure your DSC appears in the list. If it does not, install the token driver (ePass2003, SafeNet, or Proxkey) and restart Acrobat.

Method 2: Sign via Government Portal PDF Workflows

Many government portals (MCA, CBDT, GST, DGFT) have built-in DSC signing workflows. These typically use a Java applet or browser signing module:

  • Download the PDF form from the portal and fill it out
  • Upload the filled PDF to the portal's signing module
  • The portal will prompt you to select a DSC and enter your PIN
  • After signing, the portal generates a signed, stamped PDF
  • Some portals use in-browser signing via emSigner — ensure the tool is installed and running

Common Issues When Signing PDFs

  • Certificate not visible: USB token driver not installed or token not inserted properly
  • Signature shows as unknown: Adobe's trust store may not include the Indian CA root — install the CCA India root certificate
  • Signature greyed out: The PDF may be locked — open an unlocked copy
  • Java errors: Update Java to the latest version; add the portal URL to Java's exception site list
  • Wrong certificate selected: If multiple certificates are on the token, select the one matching the portal's requirement

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After signing, always verify the signature in Adobe Acrobat (right-click the signature field → Validate Signature) to confirm it shows as valid. Keep your USB token driver and Adobe Acrobat updated to avoid compatibility issues.