GUI Hub
For Claude, Cursor, VS Code & other MCP clients

Can Claude make a PDF smaller?

Not on its own. a chat AI can't run programs or write files on your computer. With the GUI Hub Essentials MCP server installed, Claude (Desktop or Code), Cursor, VS Code and other MCP clients can compress a PDF locally: the assistant calls the pdfcpu_optimize tool, which runs pdfcpu on your machine. Files are not uploaded.

Set it up (2 minutes)

  1. Claude Code / Cursor / VS Code / Windsurf: add the MCP server
    npx -y https://guihub.cc/mcp.tgz --product=essentials
    Claude Code: claude mcp add gui-hub-essentials -- npx -y https://guihub.cc/mcp.tgz --product=essentials
  2. Claude Desktop: download the one-file extension and double-click it.
  3. No AI? GUI Hub Essentials is also a point-and-click desktop app.

Then ask

“Make scan.pdf small enough to email.”

What the AI gets

pdfcpu_optimize — Shrink a PDF by removing duplicate and unused data. Text and images stay the same quality.

InputType
input*string
out*string

Cost

Free to install; each tool has 3 free uses. Then $9 once for all of GUI Hub Essentials (no subscription). The tool tells the assistant when free uses run out and how to unlock.

Powered by pdfcpu (Apache-2.0), the official release, verified by SHA-256. GUI Hub is independent and not affiliated with pdfcpu, Anthropic, Cursor or Microsoft.

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