How to Verify a Digitally Signed PDF on Mobile (2026 Guide)

Verifying a digitally signed PDF used to require Adobe Acrobat on a desktop computer. The process was clunky — you had to manually install Indian government root certificates, deal with trust store errors, and hope the software recognized the certificate authority.

In 2026, that's no longer necessary. With Falcon Sign, you can verify any digitally signed document instantly from your Android or iOS device — completely offline.

Why Verification Matters

When you receive a government document — an MCA certificate of incorporation, an Income Tax assessment order, or a GST registration certificate — it arrives digitally signed using a certificate issued by a government-licensed Certifying Authority.

But digital documents can be forwarded, copied, and potentially altered. Verification confirms three critical things:

• The document was genuinely signed by the stated entity (authenticity)
• Not a single byte has been modified since the signature was applied (integrity)
• The signing certificate was valid at the time and traces back to a trusted root CA (trust chain)

Step-by-Step: Verify a Signed PDF with Falcon Sign

The entire process takes under 10 seconds:

1. 1Open Falcon Sign on your phone (or share a PDF file to the app)
2. 2The verification banner appears automatically at the top of the document
3. 3Green checkmark = Document is valid. Red X = Something is wrong.
4. 4Tap the banner to see full details: signer name, organization, signing date, certificate authority, and chain validity

What Gets Verified?

Falcon Sign performs a comprehensive multi-layer verification:

• Signer Identity — The Distinguished Name (DN) from the X.509 certificate, showing who signed
• Document Integrity — Cryptographic hash comparison to detect any post-signing modifications
• Certificate Validity — Whether the certificate was within its validity period at signing time
• Certificate Chain — Full trust path validation up to the CCA India root certificate
• Revocation Status — Checks if the certificate has been revoked (when online)

Offline Verification — No Internet Required

Unlike other tools that require an internet connection to check certificate status, Falcon Sign works completely offline. All Indian government root certificates — CCA India, NIC CA, CDAC CA, and others — are pre-loaded in the app.

This means you can verify documents in a courtroom, at a client meeting, or in an area with no connectivity. The app validates the cryptographic signature and certificate chain locally on your device.

Documents You Can Verify

Falcon Sign supports verification of any PDF with a PKCS#7/CMS digital signature, including:

• MCA certificates (incorporation, name change, registered office)
• Income Tax assessment orders and intimation notices
• GST registration certificates and orders
• Court orders from e-filing portals (eCourts, High Courts)
• EPFO statements and certificates
• Digital police complaints from CCTNS
• Passport and visa documents issued digitally

What If Verification Fails?

If you see a red indicator, here's what each status means:

• "Document modified after signing" — The PDF has been tampered with. Do not trust it. Request a fresh copy from the issuing authority.
• "Certificate expired" — Check the signing date. If the certificate was valid when signed, the signature is still legally valid.
• "Unknown certificate authority" — The signer used a CA not in Falcon Sign's trust store. This is unusual for government documents.
• "Signature could not be verified" — The PDF may be corrupted. Try re-downloading.