Opening your Aadhaar card, PAN letter, ITR acknowledgement, or a DigiLocker PDF in Adobe Reader and seeing a yellow badge that reads "Signature Not Verified" or "Signature Validity Unknown" is extremely common in India — and it's not your fault, and it doesn't mean the document is fake. It means Adobe Reader doesn't trust the Indian government's signing certificates out of the box.
Adobe maintains its own Approved Trust List (AATL) — a curated list of Certificate Authorities whose certificates are trusted by default in Adobe products. This list is dominated by global commercial CAs. Indian government CAs — including the Controller of Certifying Authorities (CCA), National Informatics Centre (NIC), eMudhra, and Sify Technologies — are either not on this list or require additional configuration. So when Adobe encounters a PDF signed by NIC (like your Aadhaar or DigiLocker document), it cannot trace the certificate chain to a trusted root — and it raises the "Unknown" warning.
Adobe's manual fix involves downloading the NIC root certificate from the India PKI portal, then going to Edit → Preferences → Signatures → Verification → More, navigating to Manage Trusted Identities, clicking Add Contacts, importing the certificate file, checking the box for "Use this certificate as a trusted root", and restarting Adobe. If there are intermediate certificates in the chain, you'll need to repeat the process for each one. This requires comfort with PKI concepts, correct file formats (.cer vs .p7b), and specific Adobe Acrobat versions that support the feature.
| Factor | Manual Adobe Fix | VerifySign.in |
|---|---|---|
| Steps required | ~15 steps | 3 steps |
| Technical knowledge | PKI knowledge needed | None needed |
| Works on mobile | No | Yes |
| Fix travels with PDF | No (per-machine) | Yes (embedded LTV) |
| Software installation | Required | Not required |
Step 1 — Visit verifysign.in on any browser (desktop or mobile).
Step 2 — Upload your government PDF — Aadhaar, PAN, ITR, DigiLocker document, or any other.
Step 3 — Download the verified PDF. Open it in Adobe Reader — it now displays a green "Signature Valid" checkmark, no configuration required.
VerifySign.in embeds LTV (Long-Term Validation) data directly into your PDF, so the signature verification result travels with the file — to every device and every reader that opens it.
Instant digital signature verification for any government PDF — free, secure, no software needed.
Go to VerifySign.in →