Open the Aadhaar PDF file in Adobe Acrobat Reader or another PDF viewer that supports digital signatures
Check whether the signature panel shows a valid digital signature
Click the signature field to view signature details
Verify that the certificate status shows valid or trusted
Confirm that the document has not been modified after signing
Check the signer information for UIDAI or the issuing authority
Ensure the signature validation message says the signature is valid
If prompted, install or trust the required certificate authority
Use the Aadhaar QR code verification feature if digital signature validation is not available
Download the Aadhaar only from the official UIDAI website to ensure authenticity