Use a template renderer when your Open Graph (OG) image is a designed card built from fields such as a title, author, or avatar. Use Playwright or Puppeteer when the image must show a real page or element exactly as a browser renders it. In both cases, deploy a publicly fetchable image endpoint and reference its absolute URL in <meta property="og:image">. Vercel recommends 1200×630 pixels for OG images.
Choose the right automation pattern
The most reliable implementation starts by deciding what the image represents. A share card is not the same thing as a screenshot of a page.
| Decision | Template renderer (Vercel OG/Satori) | Browser screenshot (Playwright/Puppeteer) |
|---|---|---|
| Input | Structured values such as title, author, logo and image | A URL, viewport, page state or selected element |
| Best fit | Repeatable branded cards for articles, products or profiles | The actual visual state of a rendered page |
| Rendering | Supported JSX/HTML and CSS converted to SVG/PNG | A browser engine paints the page before capture |
| Main constraint | Limited CSS and asset/runtime limits | Browser startup, deterministic state and runtime resources |
Use a template for structured content
Template rendering is preferable when every record supplies known fields. You control the composition, output is predictable, and you avoid launching a browser for every request. Vercel’s OG workflow uses Satori and Resvg to convert supported HTML/CSS into a PNG. Satori does not implement the full browser CSS model: flexbox works, while display: grid does not, and its SVG is not guaranteed to match browser-rendered HTML exactly. Fonts must be TTF, OTF or WOFF, and Vercel documents a 500 KB maximum bundle including fonts, images, JSX and other assets.
Use a browser for literal page captures
Choose Playwright or Puppeteer when the OG image needs to show the page as users see it: a product detail view, a chart after JavaScript executes, or one specific component. Playwright’s Page API navigates to a URL and writes the result with page.screenshot(); Puppeteer provides equivalent Chrome and Firefox automation. Browser captures require explicit control over viewport, fonts, animations, consent UI, network timing and authentication.
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Build a dynamic OG image route with Next.js and Vercel
Vercel’s documented route pattern creates app/api/og/route.tsx and returns an ImageResponse at 1200×630. The guide lists Node.js 22 or newer and Next.js 12.2.3 or newer; verify the current requirements when you implement because framework versions change.
1. Create the route
import { ImageResponse } from 'next/og'
export const runtime = 'nodejs'
export async function GET(request: Request) {
const { searchParams } = new URL(request.url)
const title = searchParams.get('title') || 'Example article'
const author = searchParams.get('author') || 'Your site'
return new ImageResponse(
(
<div
style={{
width: '100%',
height: '100%',
display: 'flex',
flexDirection: 'column',
justifyContent: 'space-between',
background: '#111827',
color: 'white',
padding: '72px',
fontSize: 56,
}}
>
<div style={{ display: 'flex', fontSize: 28 }}>{author}</div>
<div style={{ display: 'flex', maxWidth: '1000px' }}>{title}</div>
</div>
),
{ width: 1200, height: 630 }
)
}Only use style properties supported by Satori. Load any custom font in a supported format and keep the complete route bundle within the documented limit. Validate and constrain query parameters; do not turn the endpoint into an unrestricted image-fetching proxy. If you accept an external image URL, allow-list hosts or proxy approved assets through your own storage.
2. Point metadata at an absolute URL
Your document should emit the deployed route, including its content key, as an absolute URL:
<meta property="og:image" content="https://example.com/api/og?title=Automated%20Screenshots&author=Itechguides" />The URL must be reachable by an unauthenticated social crawler. Vercel recommends allowing the image route in robots.txt so providers can fetch it:
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User-agent: *
Allow: /api/og3. Make caching vary with content
Use a stable URL or cache key that changes when the title, author, image or design changes. Otherwise a social network or CDN may retain an old card. When changing the template, invalidate the relevant cache keys or version the route. Test the deployed URL from outside your application network, not only from a logged-in browser.
Automate a real-page screenshot with Playwright
Playwright is a good default when the image must reflect browser layout. Install it in the service that will run the capture, then make the page state deterministic.
import { chromium } from 'playwright'
const browser = await chromium.launch()
const page = await browser.newPage({
viewport: { width: 1200, height: 630 },
deviceScaleFactor: 1,
})
await page.goto('https://example.com/article/42', {
waitUntil: 'networkidle',
timeout: 45_000,
})
await page.addStyleTag({
content: `*, *::before, *::after { animation: none !important; transition: none !important; }`,
})
await page.screenshot({ path: 'og-article-42.png', type: 'png' })
await browser.close()For one component instead of the whole page, locate it and call locator.screenshot(). For a full page, use fullPage: true, but remember that a full-page capture will not be 1200×630 unless you crop or design a dedicated 1200×630 view.
Stabilize the capture
- Wait for a selector that proves the meaningful content is ready, rather than relying only on a fixed delay.
- Load web fonts before capture and disable animations, carousels and blinking cursors.
- Set a fixed viewport, device scale factor, timezone and locale when those affect layout.
- Dismiss cookie banners or hide chat and newsletter widgets so they do not cover the card.
- Use test data or authenticated headers deliberately; never embed private content in a public OG URL.
- Confirm the resulting dimensions and file type, and reject an output that is blank or unexpectedly small.
Playwright’s documented navigation-and-screenshot API is described at playwright.dev/docs/api/class-page. Puppeteer is an alternative JavaScript library for automating Chrome and Firefox, with screenshot capture among its documented uses (Chrome for Developers).
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Make the image publicly fetchable
- Deploy the renderer or screenshot worker at a stable HTTPS URL.
- Ensure the response has an image content type such as
image/pngand does not require cookies, a login or an internal VPN. - Put that absolute URL in the page’s
og:imagemetadata. The Open Graph protocol reference is at ogp.me. - Allow the route in
robots.txtas recommended by Vercel. - Open the URL from a separate network and inspect the actual bytes, dimensions and cache headers.
- Use each target social platform’s preview/debugger to confirm it can retrieve the image.
When a route depends on query parameters, URL-encode titles and other values. A missing parameter should produce a safe fallback card, not a server error. Keep generation fast enough for crawler timeouts; pre-render popular records or cache successful responses when possible.
Dimensions, CSS and asset constraints
Vercel’s guide states: “Recommended OG image size: 1200×630 pixels.” That 1.91:1 canvas is the practical baseline for social previews. Keep important text away from the edges because platforms may crop previews. The Vercel renderer supports flexbox and a subset of CSS, not arbitrary browser HTML. Grid layouts, complex filters and browser-only APIs must be replaced with supported styles or rendered in a browser instead.
Use deterministic, local assets where possible. Remote fonts or images add failure points and can make a crawler receive a partially rendered card. If you must fetch an image, validate its scheme, host, size and content type, and set a timeout. Never pass an arbitrary user URL directly into a server-side fetch without protections against internal-network access.
Common failures and fixes
| Symptom | Likely cause | Fix |
|---|---|---|
| Social preview is blank | Route is private, blocked, or returns an HTML error | Fetch the absolute URL without credentials; check status, content type and robots.txt. |
| Old image keeps appearing | Social/CDN cache or unchanged image URL | Vary the URL by content or version and invalidate the stale cache. |
| Text is missing or falls back to a wrong font | Unsupported font format or font not loaded before capture | Use TTF, OTF or WOFF for Satori; preload fonts in browser captures and wait for document.fonts.ready. |
| Layout differs from the website | Satori CSS subset does not equal browser CSS | Use supported flexbox styles, or switch to Playwright/Puppeteer for browser fidelity. |
| Screenshot contains a cookie banner or chat bubble | Page state was captured before cleanup | Dismiss or hide those elements, then wait for the final selector before taking the shot. |
| Capture times out | Slow third-party resource, never-ending request, or blocked navigation | Set a bounded timeout, wait on a meaningful selector, block unnecessary resources and record the failed URL. |
| Image is clipped | Unexpected text length or fixed container dimensions | Constrain input, apply explicit wrapping/ellipsis, and test long titles and missing fields. |
| Browser worker runs out of memory | Launching a new browser for every request or capturing huge pages | Reuse a controlled browser process, limit concurrency, close pages, and capture a dedicated OG view. |
Reliability and operating costs
Template routes generally have lower per-request overhead than starting a browser, but they trade away browser-level CSS fidelity. Browser automation consumes CPU and memory and can fail because of navigation, third-party scripts or changing page state. Whichever method you use, log the input key, renderer version, response status, dimensions, duration and failure reason. Keep retries bounded; retrying a deterministic template error will not fix it, while a transient navigation failure may merit one retry.
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Separate generation from page requests when captures are slow. A queue or asynchronous worker can render, store the resulting file, and return a stable public URL. Set retention and cache policies appropriate to your content. Do not expose private records through a publicly crawlable OG endpoint.
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Use the API documentation at screenshotneo.com/docs/. Replace the example URL with the page you want represented:
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FAQ
Can an OG image endpoint require authentication?
It should not. Social crawlers need to retrieve the image without your session cookies or private network access, so publish a controlled, non-sensitive endpoint.
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Should I generate PNG, JPEG or WebP?
PNG is a safe default for text-heavy cards. Choose another format only after confirming that your target social platforms accept it and preserve the required quality.
How do I generate dynamic OG images?
Pass validated content values to a template route, make the resulting URL vary with those values, and place that absolute URL in og:image. Use browser automation instead when the source is an actual rendered page.
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Can an OG image endpoint require authentication?
It should not. Social crawlers need to retrieve the image without your session cookies or private network access, so publish a controlled, non-sensitive endpoint.
Should I generate PNG, JPEG or WebP?
PNG is a safe default for text-heavy cards. Choose another format only after confirming that your target social platforms accept it and preserve the required quality.
How do I generate dynamic OG images?
Pass validated content values to a template route, make the resulting URL vary with those values, and place that absolute URL in og:image. Use browser automation instead when the source is an actual rendered page.
Quick Recap
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