Rendex: Rendering API for Images, PDFs & Content Extraction

@copperline/rendex-mcp

MCP server for Rendex — render raw HTML, Markdown, or any URL to an image or PDF via AI agents using the Model Context Protocol.

Quick Start

Claude Desktop / Cursor / Windsurf (npx)

Add to your MCP client config:

{
  "mcpServers": {
    "rendex": {
      "command": "npx",
      "args": ["-y", "@copperline/rendex-mcp"],
      "env": {
        "RENDEX_API_KEY": "your-api-key"
      }
    }
  }
}

Where to add this:

Client	Config location
Claude Desktop	~/Library/Application Support/Claude/claude_desktop_config.json (macOS)
Cursor	.cursor/mcp.json in project root, or Settings > MCP
Windsurf	Settings > MCP Servers

Claude Code (CLI)

Add a .mcp.json to your project root with the same config above. Then restart Claude Code.

Important: Add .mcp.json to your .gitignore — it contains your API key.

Remote (zero-install, OAuth or API key)

Connect to the hosted server at https://mcp.rendex.dev/mcp — no install needed. It's fronted by OAuth 2.1 (authorization-code + PKCE S256), so OAuth-capable clients (ChatGPT, Claude, Cursor, the MCP Inspector) connect with no API key — you sign in with a one-time email code and each caller bills against their own Rendex plan and credit pool.

Clients that prefer a static key can still pass one directly:

{
  "mcpServers": {
    "rendex": {
      "url": "https://mcp.rendex.dev/mcp",
      "headers": {
        "Authorization": "Bearer your-api-key"
      }
    }
  }
}

Tools

rendex_screenshot

Render any webpage, raw HTML, or Markdown to an image or PDF.

"Take a screenshot of https://example.com"
"Capture the full page of https://news.ycombinator.com in dark mode"
"Generate a PDF of https://github.com with A4 page size"
"Capture https://amazon.de as seen from Germany"
"Render this HTML invoice as a PDF"
"Render this Markdown release note as a PDF"

Parameters:

Parameter	Type	Default	Description
url	string	required*	Webpage URL to capture. Mutually exclusive with html and markdown.
html	string	—	Raw HTML to render. Mutually exclusive with url and markdown.
markdown	string	—	Markdown to render (server converts to HTML). Mutually exclusive with url and html.
data	object	—	Key-value data for Mustache templating. When set, the html or markdown string is rendered as a logic-less Mustache template before capture. Invalid with url.
format	"png" | "jpeg" | "webp" | "pdf"	"png"	Output format
fullPage	boolean	false	Capture full scrollable page
darkMode	boolean	false	Emulate dark color scheme
width	number	1280	Viewport width (320-3840)
height	number	800	Viewport height (240-2160)
resizeWidth	number	—	Downscale output to this width in px (aspect ratio preserved if resizeHeight omitted). Ignored for PDF
resizeHeight	number	—	Downscale output to this height in px (aspect ratio preserved if resizeWidth omitted). Ignored for PDF
quality	number	80	Image quality 1-100 (JPEG/WebP only, default 80)
delay	number	0	Wait ms before capture
blockAds	boolean	true	Block ads and trackers
blockCookieBanners	boolean	—	Hide common cookie/consent banners (GDPR/CCPA) before capture
blockResourceTypes	string[]	—	Block resource types: font, image, media, stylesheet, other
device	string	—	Device preset: desktop, iphone_15, iphone_se, pixel_8, ipad, ipad_pro — sets viewport, scale, and user agent in one shot. Overrides width/height/deviceScaleFactor/userAgent
deviceScaleFactor	number	2	Device pixel ratio (1-3). 2× Retina by default
timeout	number	30	Max seconds to wait for page load (5-60)
waitUntil	string	"networkidle2"	Page readiness: load, domcontentloaded, networkidle0, networkidle2
waitForSelector	string	—	CSS selector to wait for before capture
bestAttempt	boolean	true	Return partial render on timeout instead of failing
selector	string	—	CSS selector of element to capture instead of full page
hideSelectors	string[]	—	CSS selectors to hide (display:none) before capture, e.g. ['.modal', '#newsletter-popup']. Max 50
css	string	—	Custom CSS to inject before capture (max 50KB)
js	string	—	Custom JavaScript to execute before capture (max 50KB)
cookies	array	—	Cookies to set for authenticated captures (max 50)
headers	object	—	Custom HTTP headers for the page request
userAgent	string	—	Override browser user agent string
pdfFormat	string	—	PDF page size: A4, Letter, Legal, Tabloid, A3
pdfLandscape	boolean	—	PDF landscape orientation
pdfPrintBackground	boolean	true	Print background in PDF
pdfScale	number	1	PDF scale factor (0.1-2)
pdfMargin	object	—	PDF margins: {top, right, bottom, left} as CSS values
geo	string	—	ISO country code for geo-targeted capture (Pro/Enterprise)
geoCity	string	—	City for geo-targeting (requires geo)
geoState	string	—	State for geo-targeting (requires geo)
async	boolean	—	Process asynchronously (returns job ID)
webhookUrl	string	—	URL to receive callback when async capture completes (Starter+; Free/Basic poll job status)
cacheTtl	number	—	Seconds to cache result (3600-2592000)

rendex_extract

Extract clean reader-mode content from any webpage as Markdown, JSON, or HTML. Runs the same Chromium render pass as a screenshot, so it captures content after JavaScript runs — handling SPAs that fetch-only readers miss. Strips nav, ads, and boilerplate, returning the article body plus title, byline, and excerpt. Great for feeding page content to an LLM, summarization, or RAG ingestion.

"Extract the article text from https://example.com/post as Markdown"
"Pull the readable content from this SPA as JSON so I can summarize it"

Parameters:

Parameter	Type	Default	Description
url	string	required	Webpage URL to extract readable content from
extractFormat	"markdown" | "json" | "html"	"markdown"	Output shape — markdown (LLM-friendly prose), json (structured: title/byline/excerpt/siteName/length), or html (cleaned reader-mode HTML)
device	string	—	Device preset (desktop, iphone_15, iphone_se, pixel_8, ipad, ipad_pro) — extract the mobile/tablet version of a page
blockAds	boolean	true	Block ads and trackers before extraction
blockCookieBanners	boolean	—	Hide common cookie/consent walls before extraction
hideSelectors	string[]	—	CSS selectors to hide before extraction, e.g. ['.modal', '#newsletter-popup']. Max 50
waitUntil	string	"networkidle2"	Page readiness: load, domcontentloaded, networkidle0, networkidle2
timeout	number	30	Max seconds to wait for page load (5-60)

rendex_render_link

Render a URL, raw HTML, or Markdown and get back a signed, hosted, edge-cached image URL instead of the bytes — ideal for dynamic OG images. Drop the URL into <meta property="og:image"> or an <img> tag and Rendex serves a cached copy on every share. Takes the same parameters as rendex_screenshot, plus an optional expiresIn. Returns { url, expiresAt, format, cacheTtl }.

"Make me a hosted OG-image URL for this Markdown release note"
"Give me a render link for this HTML card that I can drop into og:image"

Parameter	Type	Default	Description
(all rendex_screenshot params)	—	—	Same source (url/html/markdown), format, sizing, and templating options
expiresIn	number	server TTL	Seconds until the signed URL expires (60–2592000)

render_artifact

Turn Markdown or HTML into a branded, downloadable artifact — a PDF, a PNG, and a hosted share page — in one call. Ideal for agent outputs: reports, invoices, summaries, release notes, dashboards. Apply a logo, accent color, font, header, and footer; choose PDF page size/orientation/margins. Returns hosted URLs { pdfUrl, pngUrl, shareUrl, expiresAt } — no storage needed on your side. Each requested format costs 1 render credit.

"Turn this Markdown report into a branded PDF and PNG with our logo and an orange accent"
"Render this invoice HTML to a PDF and give me a share link that expires in a week"

Parameter	Type	Default	Description
content	string	required	The Markdown or HTML body to render (up to ~4MB)
inputFormat	"markdown" | "html"	"markdown"	How to interpret content — markdown is converted to styled HTML; html is used as a body fragment
formats	("pdf" | "png")[]	["pdf","png"]	Which formats to produce. Each costs 1 credit
accentColor	string	—	CSS accent color for the bar, links, and headings (e.g. #EA580C)
logo	string	—	http(s) URL of a logo image shown in the header
header	string	—	plain-text header line shown beside the logo
footer	string	—	plain-text footer line shown at the bottom
font	string	—	CSS font-family stack for the body
pageSetup	object	—	{ size, orientation, margin{top,right,bottom,left}, scale, width, height, fullPage }
data	object	—	Mustache data — when set, content is rendered as a logic-less Mustache template (plus {{logo}}/{{header}}/… from branding) before conversion
expiresIn	number	86400	Seconds until the hosted URLs expire (3600–2592000). Default 24h

Rendex Watch

Monitor a URL on a schedule and get notified when it changes — real-Chrome visual diff (with a highlighted overlay), an extracted-text diff, or both. Eight tools let an agent set up, inspect, edit, and tear down watches on the shared Rendex platform (one rdx_ key, one credit pool).

"Watch https://example.com/pricing for visual changes and alert my webhook"
"Before I save it, test whether you can capture #pricing on that page"
"Show me the last few runs of watch <id> — did anything change?"

Tool	Purpose	Key inputs
watch_create	Create a watch (active → captures its baseline now)	url, name?, intervalMinutes?, diffMode? (visual/text/both), threshold?, renderParams?, webhookUrl? (Starter+), notifyEmail?, paused?
watch_test	Dry-run a config first (creates nothing)	same as watch_create
watch_list	List your watches	status? (active/paused/all), cursor?, limit?
watch_get	Fetch one watch (+ baseline URL)	id
watch_run	Run a check now (1 credit)	id
watch_runs	Run history with signed before/after/overlay URLs	id, cursor?, limit?
watch_update	Edit a watch in place — interval, diff mode, channels, render params	id, plus any watch_create field; webhookUrl/notifyEmail accept null to clear a channel
watch_delete	Delete a watch + its runs	id

renderParams carries the per-check capture knobs (fullPage defaults to true, selector, device, geo (Pro+), plus noise controls ignoreRegions/ignoreText/minTextChars/suppressWhilePresent and uaMode). Interval floors are per-plan (Free 1440 / Basic 180 / Starter 60 / Pro 30 / Enterprise 5). Watch metadata + signed image URLs are returned as JSON text.

rendex_account

Check the account from inside the agent: which plan it's on, how many render credits have been used this month vs. the limit (and when it resets), the per-minute rate limit, and a one-tap upgrade link. Lets an agent answer "how much have I used?" or "how do I get more renders?" without sending the user to the dashboard. Read-only — costs no credits.

"How many Rendex renders do I have left this month?"
"What plan am I on, and how do I upgrade for more?"

Returns { plan, usage: { used, limit, remaining, unlimited, resetsAt }, rateLimitPerMinute, upgrade: { recommendedPlan, recommendedPlanCredits, upgradeUrl, manageBillingUrl } }.

Data templating

Turn one reusable template into many documents. Pass a data object alongside html or markdown, and Rendex renders the string as a logic-less Mustache template before capture — {{var}} interpolation, {{#items}}…{{/items}} loops, and nested {{a.b}} access. Great for invoices, reports, certificates, and OG cards.

"Render this HTML invoice template to a PDF, filling it with this data:
 <h1>Invoice {{number}}</h1><p>Total: {{total}}</p>
 data = { number: 'INV-014', total: '$2,400' }"

data is valid only with html or markdown — combining it with url returns a validation error.

Authentication

Get your API key at rendex.dev.

Set the RENDEX_API_KEY environment variable in your MCP client configuration.

Pricing

Plan	Calls/Month	Rate
Free	100	3/min
Starter	10,000	60/min
Pro	100,000	300/min
Enterprise	Custom	1,000/min

License

MIT — Copperline Labs LLC