Validate Document • SignFortress validator – SignFortress
SignFortress

Validate a Digital Signature

Upload any PDF to view and validate embedded digital signatures.

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Signature Validator

Validate digital signatures on any PDF with confidence.

The Signature Validator analyzes the internal structure of a PDF to detect embedded digital signatures, encryption, incremental updates, and cryptographic integrity. It works with documents from any platform, including Adobe Acrobat, DocuSign, and SignFortress.

Key Features

  • Detects standard PDF digital signatures (/ByteRange + /Contents)
  • Performs full cryptographic validation when possible using OpenSSL
  • Smart encryption detection with password prompt only when required
  • Supports encrypted SignFortress .enc files
  • Displays the full PDF in-browser for visual confirmation
  • Temporary files auto‑purged after ~10 seconds for privacy
  • Manual purge option for immediate cleanup
  • Handles complex PDFs with incremental updates and multiple revisions

How to Use

  1. Upload a PDF or .enc file
  2. Enter a password only if prompted
  3. Click “Validate Signature”
  4. Review the validation result and PDF preview
  5. Optionally purge temporary files immediately

Result meanings:
Valid digital signature means the signature was cryptographically verified
Signature detected means the signature structure exists but may not be fully extractable
Invalid or corrupted means the signature or PDF structure failed validation

Troubleshooting Tips

  • If validation fails, open the PDF in Adobe Reader to confirm integrity
  • For encrypted PDFs, ensure the correct password is used
  • Large or complex PDFs may take longer to process
  • Try re‑saving the PDF if it was exported from a non‑standard tool

Frequently Asked Questions

Is my document safe when using the Signature Validator?
Yes. Files are processed securely and automatically deleted within seconds. Nothing is stored or shared.

Can I validate documents from other platforms?
Yes. The Signature Validator works with PDFs from Adobe Acrobat, DocuSign, HelloSign, and any tool that embeds standard digital signatures.

What does “Signature detected” mean?
It means the PDF contains a valid signature structure, but full cryptographic extraction may not be possible depending on how the PDF was created.

Why am I being asked for a password?
The PDF is encrypted. The validator only prompts for a password when absolutely required to read the signature data.

What are .enc files?
These are encrypted SignFortress files. They always require a password to validate.

Privacy & Security Notice

Your document is private and secure.

  • No file is stored permanently. All files are automatically deleted within seconds after viewing.
  • All processing happens on this server only, and nothing is sent to third parties.
  • Use this tool to independently verify digital signatures on documents received via SignFortress.

Supports standard PDFs and encrypted SignFortress .enc files.

Or drag and drop a PDF or encrypted .enc file here


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