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Rendex Extension

This tutorial covers how to add the Rendex MCP Server as a goose extension to capture screenshots, generate PDFs, and render HTML to images from any webpage or raw HTML — useful for archiving UIs, generating invoices and reports, producing OG images, and giving goose a reliable "see the web" capability without spinning up a full browser automation stack.

Configuration​

Quick Install

Launch the installer

Custom Request Header

Authorization: Bearer <YOUR_RENDEX_API_KEY>
  1. Launch the installer
  2. Click Yes to confirm the installation
  3. Get your Rendex API key and paste it in
  4. Click Add Extension
  5. Click the button in the top-left to open the sidebar
  6. Navigate to the chat

Example Usage​

Let's use the Rendex extension to generate an invoice PDF from raw HTML and archive a product page.

goose Prompt​

1. Render this HTML as an A4 PDF with 1cm margins:

   <!doctype html>
   <html>
     <body style="font-family: system-ui; padding: 40px;">
       <h1>Invoice #0042</h1>
       <p>Bill to: Acme Corp</p>
       <table>
         <tr><td>MCP server listing</td><td>$500.00</td></tr>
         <tr><td>Total</td><td><b>$500.00</b></td></tr>
       </table>
     </body>
   </html>

2. Then take a full-page screenshot of https://news.ycombinator.com in dark mode

3. Return both results so I can save them

goose Output​

I'll generate the invoice PDF first, then capture the HN page.

[rendex_screenshot: format=pdf, pdfFormat=A4, pdfMargin={top: 1cm, ...}, html=<invoice markup>]
✓ PDF captured successfully (12,344 bytes)
  width: 1280  height: 800  capturedAt: 2026-04-15T12:34:56Z

[rendex_screenshot: url=https://news.ycombinator.com, fullPage=true, darkMode=true]
✓ Screenshot captured (PNG, 847KB)
  width: 1280  height: 4,321  waitStrategy: networkidle2

Both renders completed. You have:
  1. Invoice PDF (A4, 12.3KB) — base64 in result 1
  2. Dark-mode full-page screenshot of Hacker News (PNG, 847KB) — base64 in result 2

Pricing​

Rendex is free to try — no credit card required for the free tier.

PlanCalls/MonthRate limit
Free50010/min
Starter10,00060/min
Pro100,000300/min
EnterpriseCustom1,000/min

Get an API key at rendex.dev.