Most PDF tools stop at rendering.
That is useful, but it does not solve the harder problem:
Is this signed PDF actually trustworthy?
A visible signature field is not enough.
A product that works with signed PDFs usually needs to answer things like:
- Was the document changed after signing?
- Is the signature cryptographically valid?
- Does the certificate chain to a trusted root?
- Was the certificate valid at signing time?
- Is revocation status available and acceptable?
- Does the signature meet PAdES expectations?
What VerifyKit solves
VerifyKit helps applications move from "this PDF has a signature" to "this signature is verified, explainable, and usable in real workflows."
Main viewer with PDF rendering and signature-aware verification UI.
It is built for teams that need to:
- verify signed PDFs in the browser
- show clear signature status in the UI
- inspect why a signature is valid, invalid, warning, or unknown
- support React apps and no-build browser integrations
- run the same verification flow in headless Node.js processes
That is what VerifyKit is built for.
VerifyKit is a PDF digital signature verification SDK for JavaScript and TypeScript with three practical paths:
- client-side verification in the browser
- React viewer integration
- headless verification in Node.js and similar runtimes
Why this matters
A signed PDF is not automatically a valid PDF.
Real verification needs answers to questions like:
- Was the document changed after signing?
- Does the certificate chain to a trusted root?
- Was the certificate valid at signing time?
- Is revocation status known?
- Does the signature meet PAdES expectations?
Where VerifyKit fits
For browser apps, the goal is simple: open a PDF and immediately show whether signatures are valid, invalid, warning, or unknown, with the supporting verification details.
For React apps, VerifyKit separates verification from rendering:
-
useVerification()handles loading and verification -
<Viewer>handles the UI
For teams that do not want a framework integration, there is also a no-build browser path through the hosted viewer assets.
For backend workflows, the same verification model works in headless Node.js for upload validation, audit pipelines, compliance checks, and document processing.
What stands out
The docs highlight a few things that are especially useful in real applications:
- 8-point verification model
- AIA certificate chasing for missing intermediates
- PAdES B-B, B-T, B-LT, and B-LTA detection
- online revocation support through CRL and OCSP flows
- Adobe-style display parity for user-facing status
The most useful part is not just detecting that a document is signed. It is being able to explain why a signature is valid or not.
Explore it
Official docs: https://verifykit.trexolab.com/docs
Live demo: https://verifykit.trexolab.com/demo
The repository is private, so the public way to explore the product is through the hosted docs and demo.
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