✅ Verify PDF Signature
Verify a PDF's digital signature and tamper status
🔒 Your image never leaves your device. All processing happens locally in your browser using pdf-lib (client-side signature parsing). No upload, no server, no tracking.
Features
- Signature Check — Validates each digital signature in the PDF.
- Tamper Detection — Flags changes made to the PDF after signing.
- Certificate Details — Shows who signed, when, and by whom the certificate was issued.
- 100% Private — Runs in your browser — no upload.
How It Works
- Upload signed PDF — Drop your file.
- Verify — Click Verify — the tool parses the signature and certificate.
- Review results — See signature validity, signer info, and tamper status.
Use Cases
- Verify authenticity of legal contracts
- Check vendor invoices with signatures
- Validate signed internal policies
Frequently Asked Questions
What signature types are supported?
Standard PKCS#7 signatures embedded in the PDF (AcroForm signatures).
Does it trust any signer?
It verifies the cryptographic validity; trust chain validation depends on your browser's root CAs.
Upload to server?
No. Runs in your browser.
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- 📐 Flatten PDF — Make filled-in PDF form data uneditable