Aadhaar Verify Signature: Step-by-Step Guide to Validate Digital Signature & Get Green Tick

Did you just download your e-Aadhaar PDF from the official UIDAI portal, only to find a prominent yellow question mark (?) with the message "Validity Unknown" or "Signature Not Verified" at the bottom? You are not alone.

Every year, millions of Indian citizens face rejection at Passport Seva Kendras, VFS Global visa centres, banks (SBI, HDFC, ICICI), EPFO claim desks, and government KYC portals simply because their submitted e-Aadhaar contains an unvalidated digital signature. While UIDAI digitally signs every electronic Aadhaar to prevent forgery, PDF readers do not trust the signature by default until it is cryptographically verified.

In this comprehensive guide, you will learn the exact steps to verify your Aadhaar signature, why the error occurs, how to validate it on desktop and mobile, and how to get an instant, permanent Long-Term Validation (LTV) Green Tick (✓) that never disappears when shared or printed.

Understanding Aadhaar Digital Signature Statuses

When you inspect the signature panel on your downloaded e-Aadhaar, you will see one of three distinct status indicators:

Why Does the "Validity Unknown" Error Happen?

Under the Information Technology Act 2000, e-Aadhaar is a legally valid electronic document equivalent to the physical card. During PDF generation, UIDAI applies a digital cryptographic signature using certificates issued by approved Certifying Authorities (such as (DS Unique Identification Authority of India) or nCode Solutions CA).

However, when you open this PDF in Google Chrome, WhatsApp, Apple Preview, or a standard mobile PDF reader, the software cannot connect to the Indian PKI (Public Key Infrastructure) trust store. Consequently, it marks the signature as "Validity Unknown".

Method 1: Instant Online Verification with AadhaarVerify.com (Recommended)

The biggest problem with validating your Aadhaar signature manually on a PC is that the green tick does not stick to the file. Adobe Acrobat only marks the certificate as trusted on your personal computer. When you email that PDF to a bank officer, upload it to a visa portal, or print it from a photocopy shop, the yellow question mark reappears.

Furthermore, if you are on a smartphone (Android or iOS), standard mobile apps cannot inject trusted certificates at all.

Method 2: Manual Digital Signature Validation in Adobe Acrobat Reader (Desktop Only)

If you have access to a desktop computer (Windows PC or Apple Mac) and have Adobe Acrobat Reader DC installed, you can manually add UIDAI's certificate to your computer's local trust store. Follow these step-by-step instructions:

Step 1: Open e-Aadhaar in Adobe Acrobat Reader

Do not double-click to open in a web browser. Right-click your downloaded e-Aadhaar PDF file, select Open with, and choose Adobe Acrobat Reader DC.

Step 2: Enter the PDF Password

When prompted, enter your 8-character password (the first 4 letters of your name in CAPITAL letters followed by your 4-digit Year of Birth, e.g., RAME1988).

Step 3: Access Signature Properties

Scroll to the bottom of the document where the yellow question mark is located. Right-click on the signature box / question mark and select Validate Signature. In the dialog that opens, click on Signature Properties.

Step 4: View Signer's Certificate

In the Signature Properties window, click on the button labeled Show Signer's Certificate.

Step 5: Add to Trusted Certificates

1. In the Certificate Viewer window, click on the Trust tab at the top.
2. Click the button that says Add to Trusted Certificates (or Add to Trusted Identities).
3. A security warning will pop up. Click OK to confirm.

Step 6: Configure Trust Level

In the Trust Settings window, check the box for "Use this certificate as a trusted root". Also check "Certified documents". Click OK at the bottom of each open dialog box to close them.

Step 7: Re-Validate the Signature

Back in the Signature Properties dialog, click Validate Signature, then click Close. The yellow question mark will now turn into a Green Checkmark (✓) reading "Signature Valid".

How to Unlock Password-Protected e-Aadhaar (Password Format)

Before you can verify your signature, you must open the password-protected file. UIDAI follows a strict 8-character password combination:

Troubleshooting Common Aadhaar Signature Verification Errors

1. Error: "Signer's identity is unknown" or "Signature validity is UNKNOWN"

Cause: Adobe Reader does not have the UIDAI CCA Root Certificate in its Trusted Identities list.
Fix: Follow Method 2 above to add the certificate as a Trusted Root, or process the file through AadhaarVerify.com to permanently embed LTV.

2. Error: "Signature is INVALID / Document has been altered"

Cause: The PDF was compressed, edited in an online PDF editor, or corrupted during download.
Fix: Log in to myaadhaar.uidai.gov.in and download a fresh, uncompressed e-Aadhaar PDF copy.

3. Error: "Revocation check failed / Server unreachable"

Cause: Adobe Reader is attempting to reach the Certificate Revocation List (CRL) or OCSP server, but your firewall or internet connection timed out.
Fix: In Adobe Reader, go to Edit > Preferences > Signatures > Verification > More and temporarily adjust revocation checking settings.

4. Error: Green tick appears on laptop, but yellow question mark appears when printing or sending

Cause: Local client trust vs. Document-embedded Long-Term Validation (LTV). When printed directly from an unverified viewer or uploaded to a web portal, the signature is rendered without trust.
Fix: Use AadhaarVerify.com to embed the permanent LTV Green Tick into the document's visual and cryptographic layers.

Frequently Asked Questions (FAQs)