How does PDF SignCheck verify a PDF digital signature?

PDF SignCheck cryptographically validates the digital signatures embedded in PDF documents. It checks that the document has not been tampered with after signing, verifies the signer's certificate chain against trusted root Certificate Authorities (CAs), and outputs a stamped PDF with a "Verified ✓" badge — similar to clicking "Trust this certificate" in Adobe Acrobat.

Is my PDF document stored or saved during digital signature verification?

No. Your file is processed entirely in memory on the server. It is never written to disk, never stored in any database, and is discarded immediately after the verified PDF is returned to your browser. We take privacy seriously — your documents remain yours.

What types of PDF digital signatures and certificates are supported?

PDF SignCheck supports PDFs that contain PKCS#7 / CMS digital signatures — the standard used by government portals, official certificate authorities, and digital signing platforms. This includes documents from DigiLocker, e-District, MCA, UIDAI, and similar government services worldwide.

Why does Adobe Acrobat Reader display a PDF signature as "Not Verified"?

Adobe Acrobat only trusts certificates from its own Adobe Approved Trust List (AATL). Many government and institutional signers are not on that list. Our tool auto-trusts the signer's certificate after cryptographic verification — exactly what Adobe asks you to do manually when you click "Trust this certificate." The downloaded verified PDF includes a visual stamp so it's clear the signature has been validated.

Is the online PDF signature verification process cryptographically secure?

Yes. We perform full PKCS#7 signature verification: we extract the signed hash from the signature, independently compute the hash of the document's byte ranges, and compare them. We also validate the certificate chain up to a trusted root CA from the Mozilla CA trust store. This is the same process that Adobe Acrobat and other professional PDF tools use.

Are there daily or rate limits for PDF cryptographic verification?

To prevent abuse, we rate-limit to 10 requests per minute per IP address. The maximum file size is 50 MB. These limits are sufficient for normal usage. If you need higher throughput for enterprise use, please contact us.

Which Indian government certificates and portals are supported?

PDF SignCheck fully supports digital signature verification for official Indian government certificates. This includes UIDAI Aadhaar Cards, state e-District certificates (such as Caste, Income, Domicile, and Birth/Death certificates), DigiLocker-issued PDF documents, NFSA Ration Cards, Income Tax / PAN documents, and any official PDF signed via CCA India (Controller of Certifying Authorities) root credentials.

How do I resolve the "Signature Not Verified" or "Signature Not Checked" warning on Aadhaar or Caste certificates?

Simply upload your signed PDF to PDF SignCheck. Our system extracts the digital signature, cryptographically validates the hash integrity against trusted root certificates, and generates a stamped PDF. When you download this verified document, the signature will show as valid, making it suitable for direct submission.

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2 PDF signature verifications / day
2 PDF dark mode conversions / day
2 PDF duplicate page removals / day
2 PDF font changes & size edits / day
2 PDF ink/toner cost estimations / day
2 PDF reading time insertions / day
2 PDF bookmarks & TOC generations / day
2 PDF copy-paste text fixes / day
2 PDF placeholder scans & replacements / day
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5 PDF signature verifications / day
5 PDF dark mode conversions / day
5 PDF duplicate page removals / day
5 PDF font changes & size edits / day
5 PDF ink/toner cost estimations / day
5 PDF reading time insertions / day
5 PDF bookmarks & TOC generations / day
5 PDF copy-paste text fixes / day
5 PDF placeholder scans & replacements / day
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Top-up Pack

100 Credits Top-up

$4.99one-time

Add 100 lifetime-valid credits for each tool to your account.

100 credits for EACH of the 9 PDF tools
Lifetime validity (credits never expire)
Unlock bulk PDF signature verifications (up to 10 files)
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Priority server processing queues
Works on top of your daily free limit
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How do the pricing plans compare?

Feature	Guest	Free	Top-up Pack ⭐
PDF signature verifications	2 / day	5 / day	+100 credits
Bulk PDF verifications	No	No	Yes (up to 10 files)
PDF dark mode conversions	2 / day	5 / day	+100 credits
PDF duplicate page removals	2 / day	5 / day	+100 credits
PDF font changes	2 / day	5 / day	+100 credits
PDF ink/toner cost estimations	2 / day	5 / day	+100 credits
PDF reading time insertions	2 / day	5 / day	+100 credits
PDF bookmark & TOC generations	2 / day	5 / day	+100 credits
PDF copy-paste text fixes	2 / day	5 / day	+100 credits
PDF placeholder scans & replacements	2 / day	5 / day	+100 credits
PDF text & area redactions	2 / day	5 / day	+100 credits
Account required	No	Yes	Yes
Ad-free experience	No	No	Yes
Priority processing	No	No	Yes
Future features included	No	No	Yes
Price	Free	Free	$4.99 per pack

Zero-Knowledge Privacy

Files are processed strictly in secure memory modules inside your local browser. No server storage.

Cryptographic Standards

Fully compliant with IETF RFC 5652 (CMS), Adobe PDF specs, eIDAS, and Controller of Certifying Authorities (CCA).

Verify Anonymously

No personal registration or document tracking is required. Verify up to 2 files daily as guest.

Detailed Audit Trails

Generates downloadable, verified PDFs with structural signature stamps and trust summaries.

Edge Sandbox Security

Verification executes inside sandboxed browser modules to ensure isolated document handling.

Zero Data Logging

Absolutely no logging of files, names, email contents, or signature details. Pure privacy.

Have questions? Reach out at hi@pdfsigncheck.com or visit our About page.

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