PDF Viewer Plugin

View, annotate, and sign PDFs in a live interactive viewer. Mark up contracts, fill forms with visual feedback, stamp approvals, and place signatures — then download the annotated copy.

What It Does

Open PDFs from local files or academic sources (arXiv, bioRxiv, etc.)
Annotate collaboratively — Claude proposes highlights, notes, and stamps section by section; you review each batch in the viewer
Fill forms — guided field-by-field completion with live preview
Sign documents — place signature/initials images on the page
Stamp approvals — APPROVED, DRAFT, CONFIDENTIAL, or any custom label
Download — export the annotated PDF from the viewer toolbar

Commands

Command	What it does
`/pdf-viewer:open`	Open a PDF in the interactive viewer
`/pdf-viewer:annotate`	Walk through the document, propose + apply markup, review together
`/pdf-viewer:fill-form`	Fill PDF form fields interactively
`/pdf-viewer:sign`	Place a signature or initials image on the page

When to use this vs. just reading a PDF

This plugin is for interactive, visual workflows — when you want to see the document, mark it up, and download an annotated copy.

If you just want Claude to summarize or extract text from a PDF, don't use this plugin. Claude can read PDF files natively and that's faster for pure ingestion.

How It Works

This plugin uses a local MCP server (@modelcontextprotocol/server-pdf) that runs on your machine via npx. No API keys or remote services — the PDF server starts automatically when the plugin loads.

Requirements

Node.js >= 18
Internet for remote PDFs (arXiv, etc.)

Supported PDF Sources

Local files (file paths in your working directory)
arXiv — /abs/ URLs auto-convert to PDF
Any direct HTTPS PDF URL (bioRxiv, Zenodo, OSF, etc. — use the PDF link, not the landing page)

Signature Disclaimer

/pdf-viewer:sign places a visual signature image on the page. It is not a certified or cryptographic digital signature. For legally binding e-signatures, use a dedicated signing service.