What is PDF SignCheck?
PDF SignCheck helps you check whether a digitally signed PDF is authentic and untampered. Upload a signed PDF, and it validates the signature, signer identity, and certificate chain against trusted root CAs. It then gives you a verified PDF with a clear "Signature valid" stamp for submission or archiving. The tool is built for privacy: files are processed in-memory, handled in your browser session, and discarded right away. No sign-up is needed to start, and there are free daily limits plus a paid top-up option for heavier use. It also supports many government and official document sources, including Aadhaar, DigiLocker, PAN, and other PKCS#7/CMS signed PDFs.
Key features
- Validates PKCS#7 and CMS PDF signatures cryptographically.
- Checks certificate chains against trusted Mozilla root CAs.
- Adds a visible verified stamp to downloaded PDFs.
- Processes files in-memory with no storage or retention.
- Supports government documents from Aadhaar, DigiLocker, and PAN.
- Offers free use with optional paid top-up credits.
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