You download an important government PDF — your Aadhaar, a DigiLocker certificate, an ITR acknowledgement — and open it in Adobe Reader. Instead of a reassuring green tick, you see a yellow warning: "Signature Validity Unknown." The frustration is real, and the fix Adobe suggests — manually installing root certificates — feels like it requires a computer science degree.
PDF readers like Adobe Acrobat and Foxit ship with a built-in list of trusted Certificate Authorities (CAs) — mostly global commercial ones. The Indian government's signing infrastructure is rooted in the Controller of Certifying Authorities (CCA) and the National Informatics Centre (NIC). These are not included in Adobe's default trust store, so Adobe simply cannot confirm the signature chain — and flags it as "unknown" rather than "valid."
Adobe's official guidance asks you to: download the CCA root certificate from the India PKI website, open Adobe's Manage Trusted Identities panel, import the certificate file, set the appropriate trust flags, restart Adobe, and then re-open your PDF. That's at least 8–10 steps, and it only works on desktop. Foxit Reader has a similar but slightly different workflow through its Trust Settings panel. Neither fix is available on mobile, and neither survives when you share the PDF with someone else who hasn't done the same setup.
VerifySign.in takes a fundamentally different approach. Instead of asking you to configure your PDF reader, it verifies the signature server-side and then embeds the verification result directly into the PDF as Long-Term Validation (LTV) data. The resulting PDF shows as valid in any PDF reader — no certificate installation required, anywhere, ever.
VerifySign.in uses PyHanko, a Python library for PDF digital signature handling, backed by a curated trusted certificate store that includes all major Indian government CAs — CCA India, NIC, eMudhra, Sify, CDAC, and more. When you upload your PDF, VerifySign.in cryptographically verifies the signature chain, confirms the document has not been modified, then adds an LTV extension containing the OCSP/CRL responses that prove validity at signing time. This is the same technique used by enterprise PDF workflow systems, now available for free in your browser.
Step 1 — Go to verifysign.in on any device, any browser.
Step 2 — Drag and drop your government PDF onto the upload area, or tap to browse your files.
Step 3 — VerifySign.in processes the file (usually in under 10 seconds) and shows you the verification result: signer name, signing date, certificate authority, and whether the document integrity is intact.
Step 4 — Download the LTV-enabled PDF. Open it in Adobe Reader — it now shows a green "Signature Valid" tick without any additional setup.
Your privacy is protected. Uploaded files are processed in an isolated environment and automatically deleted within 2 hours. VerifySign.in does not store, index, or share your documents. The verification itself is entirely read-only — the only change made to your PDF is the addition of standard LTV metadata that makes the existing signature display correctly.
Whether you're verifying an Aadhaar card, a PAN letter, a DigiLocker degree certificate, or a GST registration document, VerifySign.in works without any software installation — on desktop or mobile, in seconds.
Instant digital signature verification for any government PDF — free, secure, no software needed.
Go to VerifySign.in →