PDFVerify

PDFVerify is a web app for verifying digitally signed PDF documents, especially Indian government and institutional eSigned files. It helps users quickly determine whether a PDF is authentic, intact, and trusted by checking the signature, certificate chain, and document integrity.

What it does

• Upload a PDF directly or import it from a public link
• Detect whether the document contains a digital signature
• Verify cryptographic signature validity
• Check certificate trust against known Indian Certifying Authorities
• Detect whether the document was modified after signing
• Generate a stamped output PDF and a structured verification report

Key features

• Simple, user-friendly verification flow
• Private-by-default processing for uploaded files
• Support for PDF-only documents up to 20 MB
• Clear verdicts such as Verified, Invalid, Untrusted, Expired, or No Signature
• Downloadable proof output for sharing and recordkeeping

Tech stack

• React + TypeScript
• TanStack Start + Vite
• Tailwind CSS
• PDF.js-style PDF handling via pdf-lib and PKIJS-based signature verification
• Shadcn UI components

Getting started

Prerequisites

• Node.js 20+
• Bun (recommended) or npm

Install dependencies

bun install

Run locally

git clone <your-repo-url>
cd PDFVerify
bun install
bun run dev

Then open the local development URL shown in the terminal.

Build for production

bun run build

Lint the project

bun run lint

Usage

1. Open the app in your browser.
2. Upload a signed PDF or paste a direct download link.
3. Wait for the verification pipeline to complete.
4. Review the result and download the stamped PDF or report.

Notes

This tool is intended as an assistive verification solution. It is not a legally binding certification service. For official verification, use the signature panel in Adobe Acrobat or the relevant Certifying Authority utility.

Project structure

• src/components: UI pages and reusable interface components
• src/lib: verification logic, PDF stamping, trust-store handling, and server helpers
• src/routes: TanStack route-based application structure

Contributing

Contributions are welcome. If you want to improve the validator, add new features, or improve trust handling, feel free to open an issue or submit a pull request.