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PDF & e-Aadhaar Digital Signature Verifier (Green Tick Online)

Note: This tool verifies the cryptographic digital signature and certificate validity inside the PDF; it does not legally certify or authenticate physical document contents, verify identity with UIDAI, or connect to government databases.

Validate your e-Aadhaar digital signature online free. Check signature validity, certificate signer details, and cryptographic integrity directly in your browser. Fast, private, and 100% client-side—your personal Aadhaar PDF is never uploaded, tracked, or stored on external servers.

1 Upload Aadhaar PDF

2 Verify Digital Signature

3 View Result

Free to use No software installation Fast & secure Works on desktop & mobile

Upload your e-Aadhaar PDF

Drag & drop your PDF here, or click to browse

Client & In-Memory verification - Nothing is saved

Private: All verification occurs in your browser. Your PDF is never uploaded or stored.

Verifying Digital Signature...

Inspecting cryptographic byte ranges and X.509 certificate

Signer

Unique Identification Authority of India

Certificate

Valid

Document Integrity

No changes detected

Signature

Valid

Example of a valid e-Aadhaar PDF with digital signature

Verify Signature

Check the embedded digital signature

Certificate Details

View signer and certificate information

Check Integrity

Ensure document is not modified

Fast & Easy

Get results instantly

Private

Your file never leaves your device

What is an e-Aadhaar Digital Signature?

What is e-Aadhaar digital signature validation? e-Aadhaar digital signature validation is the mathematical process of verifying the cryptographic authenticity, X.509 signing certificate, and byte-range integrity of an electronic Aadhaar PDF issued by UIDAI, confirming that the document is genuine and unmodified since creation.

An e-Aadhaar digital signature is an electronic cryptographic certificate applied by the Unique Identification Authority of India (UIDAI) when an official electronic Aadhaar document is generated. Unlike a static scanned photocopy, rubber stamp, or visual tick mark, a digital signature uses Public Key Infrastructure (PKI) conforming to the international ISO 32000 PDF standard. It embeds an X.509 digital certificate, cryptographic hash values, and timestamps directly into the PDF binary data.

When you download an official e-Aadhaar PDF from UIDAI, the document carries this embedded signature dictionary. When opened in PDF software, the signature status is evaluated:

Green Checkmark (✓): The digital signature is cryptographically intact and the signing certificate is recognized by the viewer's local trust store.
Yellow Question Mark (?): The cryptographic signature is present, but the viewer has not yet verified or established trust with the issuing Certificate Authority.
Red Cross (✕): The document has been modified, tampered with, or corrupted after signing.

What PixDok Checks in Your PDF

PixDok's free PDF signature verifier inspects the internal structural components of the document in your browser:

Cryptographic Byte Ranges: Evaluates the signed byte boundaries to verify that zero alterations occurred after the signature was stamped.
Signing Certificate Authority: Reads the X.509 digital certificate details, including signer organization (Unique Identification Authority of India) and issuing certificate authority.
Mathematical Hash Integrity: Confirms whether the SHA hash matches the document payload.
Document Modification Status: Detects whether pages, form fields, text layers, or annotations were modified or re-saved.

What PixDok Does NOT Check

It is essential to understand the technical boundary between cryptographic document validation and government identity authentication:

Does NOT connect to the UIDAI central database: PixDok processes the PDF file locally and does not communicate with government servers.
Does NOT authenticate biometric or demographic records: PixDok cannot check whether the individual named on the document exists, is living, or has active biometric credentials.
Does NOT replace legal government verification: Validating a digital signature confirms the mathematical integrity of the PDF file; it does not replace official identity authentication required by banks, passport offices, or government agencies.

How to Validate Aadhaar Card Signature in PDF Using Adobe Acrobat (PC)

How do I validate an Aadhaar signature in PDF on PC? Open your e-Aadhaar PDF in Adobe Acrobat Reader on your computer, click on the signature panel or yellow question mark, navigate to Signature Properties > Show Signer's Certificate > Trust, click Add to Trusted Certificates, check "Use this certificate as a trusted root", click OK, and click Validate Signature to display the green checkmark.

If you want to validate your Aadhaar card signature in PDF using desktop software, Adobe Acrobat Reader (Windows and macOS) is the industry-standard tool. Follow these 6 step-by-step instructions:

Open e-Aadhaar PDF in Adobe Acrobat Reader

Download and open your official e-Aadhaar PDF in Adobe Acrobat Reader DC (avoid third-party browsers or preview apps for desktop validation). Enter your 8-character password to unlock the document.

Click on the Yellow Question Mark (?)

Locate the digital signature area (usually near the bottom-left or bottom-right of the Aadhaar card) displaying a yellow question mark. Right-click or left-click on the signature box, or open the Signature Panel on the left sidebar.

Open Signature Properties

In the signature validation dialog box, click on Signature Properties..., then click on the button labeled Show Signer's Certificate....

Add Certificate to Trusted Certificates

Click on the Trust tab at the top of the Certificate Viewer window, then click Add to Trusted Certificates. When prompted with a security alert, click OK.

Check "Use this certificate as a trusted root"

Under the Import Contact Settings dialog, ensure the checkbox labeled Use this certificate as a trusted root is checked. Click OK twice to close the certificate dialogs.

Click Validate Signature

Click Validate Signature in the Signature Properties dialog. The yellow question mark will instantly transform into the official Green Checkmark (✓) indicating "Signature is Valid".

Note: Adding trust to Adobe Acrobat Reader configures trust locally on your specific computer. If you transfer the raw PDF file to a phone or another computer that has not installed the root certificate, it may revert to showing a yellow question mark.

How to Validate Aadhaar Card Signature on Mobile Devices

Can you validate an Aadhaar signature on a mobile phone? Yes. While standard mobile PDF apps (such as Google Drive PDF Viewer or Adobe Acrobat mobile) do not support root certificate installation and show a yellow question mark, you can validate your e-Aadhaar digital signature directly in your mobile browser using PixDok's free online verifier without installing apps.

Millions of users search for an e Aadhaar digital signature validation app or wonder how to validate Aadhaar card signature in mobile. However, mobile operating systems present unique technical constraints:

Why Mobile PDF Apps Fail to Show the Green Tick

Native mobile PDF viewers—including Adobe Acrobat Reader for Android & iOS, Apple Books, and Google Drive—lack the desktop Public Key Infrastructure (PKI) settings menu. They cannot import custom Root Certificate Authorities (CAs) issued by the Controller of Certifying Authorities (CCA India). As a result, genuine e-Aadhaar PDFs almost always display a yellow question mark on smartphones.

How to Validate Your Aadhaar Signature on Mobile Without Any App

PixDok eliminates this limitation by running cryptographic byte-range inspection and X.509 certificate validation directly in your mobile browser:

1. Open PixDok on Your Phone

Launch Chrome, Safari, Samsung Internet, or Firefox on your smartphone and visit pixdok.com/pdf-signature-verifier.

2. Select e-Aadhaar PDF

Tap Choose e-Aadhaar PDF. Select your file from the Downloads folder (Android) or the Files app (iPhone/iPad).

3. Unlock in Memory

Enter your standard 8-character password (e.g. SAMI1990). The cryptographic verification executes in memory within 1–2 seconds.

4. View Verification Report

Inspect certificate details, signer identity, and document integrity to verify that your Aadhaar PDF is genuine and unmodified.

e-Aadhaar Digital Signature Validation Not Working? Troubleshooting Guide

Why is e-Aadhaar signature validation not working? e-Aadhaar signature validation fails primarily due to: (1) missing root certificates in the PDF reader, (2) post-signing modifications or saving via unofficial editors, (3) scanning a paper printout, or (4) lack of an active internet connection required to verify certificate revocation lists (CRL/OCSP).

If your e-Aadhaar digital signature validation is not working as expected, examine these common technical issues and their solutions:

1. Yellow Question Mark (?) — "Signature Validity is Unknown"

Reason: The cryptographic signature exists and is valid, but the software reading the file does not have the certificate authority in its trusted root store.
Fix: This does not mean your Aadhaar is invalid. On PC, follow the Adobe Acrobat trust root steps outlined above. On mobile or web, use PixDok to verify the signature parameters.

2. Red Cross (✕) — "Signature is Invalid"

Reason: The mathematical hash does not match the file contents. This happens when the PDF has been edited, cropped, re-compressed, re-saved via basic software, or corrupted during download.
Fix: Never edit a digitally signed PDF with standard PDF editors. Download a fresh, untouched copy of your e-Aadhaar directly from the official UIDAI myAadhaar portal.

3. Untrusted Root Certificate

Reason: India's electronic signatures are governed under the Information Technology Act by the Controller of Certifying Authorities (CCA India). If your reader does not include the CCA India Root Certificate, the certificate chain remains incomplete.
Fix: Install the CCA India Root Certificate into Adobe Acrobat Reader or check file validity using PixDok's web verifier.

4. Network Connectivity & Timestamping Servers

Reason: Digital signature validation often requires contacting online Online Certificate Status Protocol (OCSP) or Certificate Revocation List (CRL) servers to check whether the signing key was active at the time of signing.
Fix: Ensure your device has an active internet connection when validating signatures in Adobe Acrobat or web tools.

5. Scanned Photocopies & Screenshots

Reason: Scanning a paper Aadhaar card or taking a screenshot creates an image raster (JPG/PNG). Visual pixels cannot carry cryptographic byte-range hashes or X.509 certificates.
Fix: Use the original electronic PDF file downloaded from UIDAI (`eaadhaar.pdf`).

Aadhaar Validity Date Check Online vs Digital Signature Validation

Does Aadhaar have an expiry or validity date? No. An Aadhaar number does not have an expiration or validity date; it remains valid for life unless deactivated. An "Aadhaar validity check online" refers to verifying your 12-digit Aadhaar number status on the official UIDAI portal (myaadhaar.uidai.gov.in), which is completely distinct from verifying the digital signature of a PDF file.

A common point of confusion among citizens searching for Aadhaar validity date check online is conflating document cryptographic validation with government identity status:

Verification Type	What It Checks	Where to Perform	Official Authority
e-Aadhaar Digital Signature Validation	Cryptographic integrity of the downloaded PDF, signer certificate, and absence of post-signing file modifications.	PixDok PDF Signature Verifier or Adobe Acrobat Reader.	Independent Document Verification / PKI Standards
Aadhaar Number Validity Check	Confirms whether the 12-digit Aadhaar number is active in the central database, along with state, gender, age band, and registered mobile digits.	myAadhaar Check Aadhaar Validity Portal	Unique Identification Authority of India (UIDAI)

If an organization asks you to verify whether your Aadhaar card is active, visit the official UIDAI portal. If you need to confirm that your downloaded e-Aadhaar PDF is genuine, tamper-free, and digitally signed, use PixDok's PDF Signature Verifier.

How to Download Original e-Aadhaar for Digital Signature Validation

How do I download an e-Aadhaar with a valid digital signature? Visit the official UIDAI myAadhaar portal at myaadhaar.uidai.gov.in, select "Download Aadhaar", enter your 12-digit Aadhaar Number, 16-digit Virtual ID (VID), or 28-digit Enrolment ID (EID), enter the captcha, complete OTP verification sent to your registered mobile number, and download the digitally signed PDF.

To ensure your document can be successfully validated, you must always download the original electronic file directly from the government portal. Follow these official steps:

Visit the official UIDAI myAadhaar portal: Go to myaadhaar.uidai.gov.in/genricDownloadAadhaar.
Select your identification credential: Choose between Aadhaar Number (12 digits), Enrolment ID (28 digits), or Virtual ID (16 digits).
Enter security captcha: Type the displayed captcha characters and click Send OTP.
Enter Mobile OTP: Enter the 6-digit One-Time Password received on your UIDAI-registered mobile number.
Download e-Aadhaar: Click Verify & Download. Your digitally signed e-Aadhaar PDF will download instantly.
Open with Password: The file is protected with your 8-character password (e.g., if your name is ANEESH and birth year is 1995, enter ANEE1995).

Once downloaded, upload the PDF directly to PixDok's e-Aadhaar Digital Signature Verifier to inspect its cryptographic certificate.

Original e-Aadhaar PDF vs Scanned Copy

A fundamental rule of digital signature validation in PDF online is distinguishing between an original digitally signed electronic document and an image-based reproduction.

When UIDAI generates an e-Aadhaar PDF, it embeds a digital signature object containing an encrypted digest of the document contents. A scanned photocopy or screenshot merely captures the visual appearance of the checkmark or question mark. Because pixels have no cryptographic properties, no software can validate a digital signature from a scanned file.

Document Format	Digital Signature Verification	Underlying Data Type
Original digitally signed e-Aadhaar PDF	Fully Supported	Vector PDF with embedded X.509 PKI signature dictionary
PDF downloaded from official UIDAI portal	Supported	Original cryptographic byte ranges intact
Screenshot of e-Aadhaar (JPG / PNG)	Not Applicable	Flat pixels only; no cryptographic signature dictionary
Scanned copy of paper Aadhaar	Not Applicable	Image raster wrapped in PDF container; original signature lost
Re-saved / re-exported PDF from image editors	Usually Invalid	Byte ranges altered; digital checksum fails

Is e-Aadhaar Digital Signature Validation Free?

Yes. PixDok provides e-Aadhaar PDF digital signature validation completely free of charge. There are no registration fees, no subscription tiers, no paywalls, and no hidden trial periods.

Whether you are an individual verifying your downloaded e-Aadhaar, a student submitting official documents, or a Cyber Cafe / CSC center operator assisting citizens with government document preparation, you can validate signatures as many times as necessary without restrictions.

Privacy and Security Standards

Aadhaar documents contain sensitive personally identifiable information (PII). PixDok's verification pipeline is engineered with a strict privacy-first architecture:

Volatile In-Memory Processing: When an e-Aadhaar PDF is submitted for signature validation, it is processed strictly within volatile system memory (RAM). The file is never permanently written to server storage disks or persistent databases.
Zero Data Retention: As soon as the cryptographic signature parameters and certificate properties are extracted and returned to your browser, all memory allocations for the file are released.
No Demographic or Biometric Harvesting: PixDok does not extract, catalog, log, or sell Aadhaar numbers, personal names, phone numbers, addresses, or biometric details.
Secure HTTPS Transmission: All communications between your device and the verification service are encrypted using 256-bit SSL/TLS protocol to prevent third-party interception.

Frequently Asked Questions

Find accurate answers to common questions about e-Aadhaar digital signature validation and certificate verification.

Upload your original digitally signed e-Aadhaar PDF to PixDok's PDF Signature Verifier. The tool inspects embedded cryptographic digital signature dictionaries, validates certificate byte ranges and signer authority, and displays signature validity status and document integrity details instantly in your browser.

Yes, PixDok provides 100% free digital signature validation for e-Aadhaar PDFs. There are no fees, subscriptions, account registrations, or file limits.

Open the e-Aadhaar PDF in Adobe Acrobat Reader on your computer, click the signature box or open the Signature Panel, click Signature Properties > Show Signer's Certificate, go to the Trust tab, select Add to Trusted Certificates, check Use this certificate as a trusted root, click OK, and click Validate Signature to display the green checkmark.

Standard mobile PDF apps often cannot validate signatures because they lack desktop PKI certificate stores. You can validate your Aadhaar PDF signature on mobile by opening pixdok.com/pdf-signature-verifier in your mobile browser (Chrome or Safari), choosing the PDF from your device storage, and unlocking it for instant verification.

Signature validation usually fails or shows a yellow question mark because: (1) the PDF reader does not have the signer's root certificate in its trust store, (2) the document was modified or re-saved post-signing, (3) the file was converted to an image/raster format, or (4) internet connectivity was unavailable for certificate revocation checks.

No. A yellow question mark indicates that the PDF viewer has not established trust with the signing certificate. It does not by itself mean the document is fake or altered. Once the certificate is trusted, the signature confirms valid document integrity.

An Aadhaar number itself does not have an expiration or validity date; it is issued for life. An Aadhaar validity check is an official service on the UIDAI portal (myaadhaar.uidai.gov.in) to verify whether an Aadhaar number is active in the central repository, whereas PDF digital signature validation verifies cryptographic file integrity.

You can download an official digitally signed e-Aadhaar directly from the UIDAI myAadhaar portal (myaadhaar.uidai.gov.in) by entering your 12-digit Aadhaar number, Virtual ID (VID), or Enrolment ID (EID) with mobile OTP authentication.

No. A scanned Aadhaar document is an image raster without embedded cryptographic byte ranges or X.509 digital certificate objects. Digital signature validation requires the original digitally downloaded electronic PDF.

No. PixDok verifies the cryptographic digital signature contained within the PDF file. It does not connect to government identity databases and does not authenticate personal demographic or biometric records.