Verify PDF Digital Signatures
Instantly validate the integrity and authenticity of digitally signed PDF documents. Verify signer identities, cryptographic trust chains, and download verified files with automatic trust stamps.
How does our Zero-Knowledge Security Architecture keep files safe?
100% SecureYour PDF is processed strictly inside your browser session. We never upload, store, or share your files. All operations are transient with 100% client-side privacy.
Upload your PDF
Drag and drop your file here, or click to browse
What changes after digital signature verification?
Your PDF signature goes from "Not Verified" to "Signature valid" — automatically and cryptographically.
How does online PDF digital signature verification work?
Three steps from upload to verified document.
Upload your PDF
Drag and drop or click to select a digitally signed PDF from any government portal or signing service.
Cryptographic verification
We extract PKCS#7 signatures, compute document hashes, and validate the certificate chain against 82 trusted root CAs.
Download verified PDF
Preview and download your PDF with a "Signature valid" stamp — ready for submission or archival.
Why choose PDF SignCheck for signature verification?
Enterprise-grade verification, zero complexity.
Cryptographic integrity
Full PKCS#7 hash verification against byte ranges. Any tampering is instantly detected.
Auto-trust certificates
Certificates validated against Mozilla CA trust store — no manual configuration needed.
Verified stamp output
Output PDF includes a visual "Signature valid" stamp matching Adobe Acrobat's style.
Zero storage policy
Files processed entirely in-memory and immediately discarded. Nothing ever written to disk.
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Simple, Transparent Limits
Choose the plan that fits your verification frequency. Protect your document workflows with cryptographic integrity.
Guest
For quick one-off verifications without registering.
- 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
- Zero-storage security policy
- Supported by clean banner ads
Free Account
Double your limits just by creating a free account.
- 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
- Secure account profile
- Supported by clean banner ads
100 Credits Top-up
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)
- 100% Ad-free experience (No ads)
- Priority server processing queues
- Works on top of your daily free limit
- Buy as many times as you need
Frequently Asked Questions
Everything you need to know about verifying PDF signatures.
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.
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.
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.
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.
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.
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.
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.
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.