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How to Verify Form 16 Digital Signature Online (TDS Certificate)

Every year during tax filing season, employers across India issue Form 16 (Part A & Part B) to their employees as proof of Tax Deducted at Source (TDS). Form 16 is generated through TRACES (TDS Reconciliation Analysis and Correction Enabling System) and is digitally signed by the authorized signatory of the employer.

However, when you open the PDF on your smartphone or in standard browsers like Chrome or Edge, the signature frequently displays a yellow question mark (?) or a warning saying "Signature Validity Unknown".

Why Does Form 16 Show "Signature Validity Unknown"?

The digital signature on Form 16 is created using a Class 3 Digital Signature Certificate (DSC) issued by a licensed Certifying Authority (such as eMudhra, Capricorn, Vsign, or Pantasign) approved by the Controller of Certifying Authorities (CCA) of India.

Because standard PDF readers do not have the Indian National Root Certificate in their trusted root store, they cannot automatically verify the certificate chain. This leads bank loan officers and visa consulates to query whether the Form 16 is legitimate.

How to Fix Form 16 Digital Signature Using VerifySign.in

Instead of wrestling with manual Adobe Acrobat Trust settings on a desktop computer, you can verify your Form 16 online in three quick steps:

1. Upload Form 16 PDF: Drag and drop your Form 16 file onto the VerifySign.in homepage or ITR Verifier.
2. Instant Cryptographic Check: Our backend verifies the cryptographic hash against the CCA India root hierarchy.
3. Download Verified Copy: Get an LTV-enabled PDF featuring a permanent green checkmark stamp stating "Signature Valid" and the signer's identity.