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](https://arxiv.org) — `/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.