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Signing a PDF with Your DSC

A digitally signed PDF is legally a signed document. It also breaks the moment anyone edits it, which is the point and also the thing people trip over.

What signing actually does

When you sign a PDF with your certificate, two things are recorded: that it was you, and exactly what the document said at that moment. Any change afterwards — even something as innocent as re-saving it in another program — breaks the signature, and the reader will show it as invalid.

So the practical rule is simple and people learn it the hard way: sign the final version. Not the draft you intend to tidy up, not the one you will add a page to. Once signed, the file should not be touched.

The same applies to combining documents. Merging a signed PDF into a larger file usually breaks the signature inside it.

What the recipient sees

What they seeWhat it means
Green tickSignature valid and the issuer is trusted. Nothing to do
Yellow question markSignature is fine but their reader has not been told to trust the issuer. Their setting, not your problem — see our page on the PDF question mark
Red crossThe document changed after signing. Sign the final version again

A yellow question mark causes a great deal of unnecessary worry. It does not mean your certificate is bad and it does not mean the document was tampered with. It means the reader has not been updated to trust Indian certifying authorities.

Written 5 September 2026. Government requirements and portal behaviour change — message us to confirm before you rely on any date or figure here.

Practical points

  • The token must be plugged in and its driver working. If the signing option does nothing, that is usually why.
  • Some recipients require a visible signature appearance with your name and date. Departments in particular. Ask before sending.
  • Some require a timestamp. That is a signing setting, not something the recipient can fix at their end.
  • Keep the signed original. Send copies; do not re-save the file you signed.

Common questions

A signature made with a valid certificate from a licensed certifying authority carries legal recognition. That is the whole basis on which government portals accept them.

The certificate lives on a USB crypto token, so signing generally needs a computer with the token connected and its driver installed.

First check whether they are seeing a yellow question mark, which is a trust setting on their side, or a red cross, which means the file changed. Those need completely different fixes.

No. Your digital signature is legally yours and should stay with you. We will help you set up signing and fix it when it breaks.

Send us your case

Tell us what you are signing and who is receiving it. Some recipients have specific requirements worth knowing before you send.

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