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PDF Digital Signature PAdES and Trust Chain Validator

· Last updated：2026-08-04

Audit PDF signatures, PAdES baseline evidence, certificate chains, DSS, revocation material and timestamps offline.

Details

What this tool helps you do

Rebuilds PDF ByteRange bytes, verifies CMS signed attributes and messageDigest, inspects embedded X.509 chains, DSS Certs/OCSPs/CRLs/VRI and timestamp evidence. It never performs online OCSP/CRL/AIA requests or claims legal/eIDAS conformity.

Execution

Run this tool

Fill in the form, run the tool, and review the result in one place.

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Written by the Elysia Tools team

Tool usage guide

Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Category
PDF Tools
Input types
file
Output type
json
Sample coverage
4
API ready
Yes

Overview

PDF Digital Signature PAdES and Trust Chain Validator audits one PDF offline and returns a JSON report covering signatures, ByteRange data, CMS signed attributes, X.509 certificate chains, DSS evidence, revocation material, and timestamps.

When to use

  • Check whether a PDF contains a digital signature and inspect its signed data.
  • Review embedded PAdES, DSS, OCSP, CRL, VRI, certificate-chain, or timestamp evidence.
  • Audit PDF signature evidence without making online OCSP, CRL, or AIA requests.

How it works

  1. 1Upload one PDF file up to the tool's supported file limit.
  2. 2The validator rebuilds the PDF ByteRange bytes and checks CMS signed attributes and the messageDigest.
  3. 3It inspects embedded X.509 certificates, certificate chains, DSS Certs, OCSPs, CRLs, VRI entries, and timestamp evidence.
  4. 4The tool returns the audit findings as JSON, including explicit results for unsigned PDFs and detected validation evidence.

Use cases

  • Review signed contracts and records for embedded signature and certificate evidence.
  • Inspect whether a PDF includes DSS and long-term validation material.
  • Create a repeatable offline audit report for unsigned or signed PDF files.

Compare alternatives

  • Audit a tagged PDF's logical structure tree against PDF/UA-1 (ISO 14289-1) semantics: RoleMap termination, H1-H6 heading hierarchy, Alt text on Figure/Formul…

  • Audit PDF documents for accessibility features like tagging, language and PDF/UA metadata

  • Pre-validate PDF documents for PDF/A archival compliance

Who it's for

Best for

  • Validate PDF files in the browser.
  • The “Audit a PDF with no digital signature” workflow, done in one pass.
  • Repeatable jobs with PDF files and the same settings every time.

Not ideal for

  • Fully automated batch jobs — this page is built for interactive use; use the API endpoint for scripts.
  • Files in formats this tool does not accept — it works with .pdf input.

Edge cases & common failures

  • Very large files

    Large files take longer and can hit browser memory limits — try a smaller sample first.

  • Skipping the output check

    Compare the first rows or pages of the output with the input before using it in production.

  • Files from unusual exporters

    Some files use format variants that do not convert cleanly — if the output looks wrong, re-save the file from the app that created it and try again.

Examples

1. Audit a PDF with no digital signature

Document auditor

Background

An auditor needs to confirm whether a standard multipage PDF contains a digital signature dictionary.

Problem

The document may be valid as a PDF but provide no embedded signature evidence.

How to use

Upload `sample-multipage.pdf` and run the offline audit.

Outcome

The tool returns a JSON audit report that explicitly identifies the PDF as unsigned.

2. Inspect a PDF for DSS evidence

Compliance reviewer

Background

A reviewer is checking a PDF for embedded long-term validation evidence and related signature data.

Problem

The reviewer needs to determine whether DSS and PAdES-related evidence is present in the file.

How to use

Upload `pdf-password-protector-example1.pdf` and run the validator.

Outcome

The tool returns a JSON report covering detected DSS and PAdES evidence, along with relevant certificate, revocation, and timestamp findings.

FAQ

What file can I upload?

Upload one PDF file.

Does the validator check PDF signatures offline?

Yes. The audit is performed offline.

Does it make OCSP, CRL, or AIA requests?

No. It does not perform online OCSP, CRL, or AIA requests.

What evidence does the audit inspect?

It inspects ByteRange data, CMS attributes, messageDigest values, X.509 chains, DSS evidence, revocation material, VRI entries, and timestamps.

Does the result prove legal or eIDAS compliance?

No. The tool does not claim legal or eIDAS conformity.

Hub

PDF Signing, Stamping, and Distribution Tracing

Send PDFs you can prove are yours — redact sensitive content permanently before sealing, add a visible signature block and a PAdES certificate signature, stamp the document status, embed invisible per-recipient tracking IDs, and audit incoming signatures down the certificate chain.

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