Generate OG Images & Social Media Previews with a Screenshot API

When you share a link on Twitter, LinkedIn, or Slack, the platform fetches an Open Graph image to display as a preview card. Static OG images are fine for homepages — but what about blog posts, user profiles, or product pages that need unique, dynamic preview images?

SnapAPI lets you render any HTML page as a PNG image via a simple API call. Build an HTML template with your title, author, and branding, host it on a URL, and let SnapAPI screenshot it into a pixel-perfect OG image.

How It Works

The workflow is straightforward:

Create an HTML template — Design your OG card layout (1200×630px) with CSS. Use query parameters for dynamic content.
Call SnapAPI — Pass the template URL to the screenshot endpoint. SnapAPI renders it in a real Chromium browser.
Serve the image — Use the returned PNG as your og:image meta tag, or cache it on your CDN.

Code Example

Screenshot an OG Template

Node.js

const response = await fetch('https://snapapi.eu/v1/screenshot', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
    'X-API-Key': process.env.SNAPAPI_KEY
  },
  body: JSON.stringify({
    url: 'https://yoursite.com/og-template?title=My+Post&author=Jane',
    width: 1200,
    height: 630,
    format: 'png'
  })
});

const imageBuffer = await response.arrayBuffer();
// Upload to S3, serve from CDN, or return directly

Dynamic Meta Tags

Point your og:image to a serverless function that calls SnapAPI on-the-fly:

HTML

<!-- In your page's <head> -->
<meta property="og:image"
      content="https://yoursite.com/api/og?title=My+Blog+Post" />
<meta property="og:image:width" content="1200" />
<meta property="og:image:height" content="630" />

Why Use SnapAPI for OG Images?

Real browser rendering — Full CSS support, custom fonts, gradients, SVGs. No template language limitations.
EU-hosted, GDPR compliant — All rendering happens on servers in Germany. No data leaves the EU.
Fast — Typical render times under 2 seconds. Cache the result and serve instantly.
Simple API — One POST request, one image back. No SDKs required.

Start Generating OG Images

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