You've downloaded your e-Aadhaar PDF from the UIDAI website, opened it in Adobe Acrobat or any PDF reader, and there it is — a frustrating yellow question mark or the message "Signature Validity Unknown." Don't panic. Your document is genuine. The problem lies with how PDF readers handle India's digital certificate authorities, and it can be fixed in under a minute.
The root cause is a mismatch between the certificate authority that signed your Aadhaar PDF and the certificates your PDF reader trusts by default. Here's the chain:
UIDAI signs e-Aadhaar PDFs using certificates issued under India's National Informatics Centre (NIC), which itself operates under the Controller of Certifying Authorities (CCA) of India. Adobe Acrobat's trusted root store — called Adobe Approved Trust List (AATL) — includes hundreds of global CAs but does not include India's CCA root certificate by default. So Acrobat sees an unfamiliar signing authority and displays the yellow "Validity Unknown" warning instead of a green tick.
This is a trust configuration issue, not a problem with your document. The signature is mathematically valid — your PDF reader just doesn't know that yet.
Option 1 — Install the NIC root certificate manually: You can download India's CCA root certificate from the official website and import it into Adobe Acrobat's Trust Manager. This is a multi-step process requiring admin privileges, is version-specific, and must be repeated on every new device or after software reinstalls. It's the most permanent solution but also the most technically demanding.
Option 2 — Use Adobe's online verification: Some versions of Acrobat can reach out to online certificate validation services. However, this requires a stable internet connection every single time you open the document and doesn't work for archived copies.
Option 3 — Use VerifySign.in (Easiest): VerifySign.in validates the signature server-side, embeds all necessary verification data (LTV — Long-Term Validation) into the PDF, and returns a copy that shows a permanent green tick in any viewer, on any device, without any certificate installation.
VerifySign.in requires zero technical knowledge. There's no software to install, no certificates to download, no admin access needed. It works on Windows, Mac, Linux, iOS, and Android — anywhere you have a browser. The verification happens in seconds using server-side cryptographic validation against the full NIC/UIDAI certificate chain.
Step 1: Visit verifysign.in in your browser.
Step 2: Click "Upload PDF" and select your e-Aadhaar file.
Step 3: Enter your Aadhaar password if prompted. The password format is: first 4 letters of your name in uppercase + year of birth (e.g., RAJE1990 for Rajesh born in 1990).
Step 4: VerifySign.in validates the signature and displays the signer name, certificate details, and verification status — all in a clear, readable panel.
Step 5: Optionally download the LTV-enabled PDF for ₹49 to permanently fix the validity unknown error on all future opens.
If your password doesn't work on the first try, check these: ensure you're using uppercase letters for the name portion, confirm the year of birth matches what's on your Aadhaar card, and try variations of your name if it's hyphenated or contains initials. Example: if your name is "A. Kumar", try AKUM1985. If your name has fewer than four characters, use all of them.
Instant digital signature verification for any government PDF — free, secure, no software needed.
Go to VerifySign.in →