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Use a SvelteKit +server.ts route to return an image generated with the ImageResponse API from the Sveltekit OG library, then point each page’s Open Graph metadata at that route’s public, absolute URL. For a finite set of pages whose content is available during the build, prerender the image routes; use runtime generation when image content depends on request-time data or cannot be enumerated at build time.
How the image route and page metadata fit together
An Open Graph image is the visual asset a social or messaging service can use in a shared-link preview. Generating the image is only half the setup: the page’s HTML must also identify the image through its Open Graph metadata, and the image URL must be publicly accessible.
The implementation below uses the ImageResponse API documented by the Sveltekit OG library. It is not a native SvelteKit image-generation API. The library describes ImageResponse as extending the standard Web Response, and its documented example uses a Svelte component, dimensions, and font data. See the Sveltekit OG documentation for the current API and setup details.
- Create an image-specific server route such as
src/routes/og/[slug].png/+server.ts. - Load the page record for the requested slug and return a not-found response if it does not exist.
- Pass the record’s title and other card data to a Svelte component through
ImageResponse. - Set the image dimensions and provide any custom font as binary data.
- Put the absolute image URL in the corresponding page’s Open Graph metadata.
The library’s documentation includes a +server.ts example and shows export const prerender = true as an optional setting. Check its current installation instructions and API reference before using the illustrative code below; package setup and exact helper signatures are library-specific.
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Build the card as a Svelte component
Keep the visual design separate from the route’s data lookup. The component receives page-specific values as props, so one card design can serve many pages. For example, save this as src/lib/OgCard.svelte:
<script lang="ts">
export let title: string;
export let description: string;
</script>
<div style="display:flex; flex-direction:column; justify-content:space-between; width:100%; height:100%; padding:64px; background:#101827; color:white; font-family:Inter;">
<div style="font-size:24px; opacity:0.8;">Example site</div>
<div>
<div style="font-size:64px; font-weight:700; line-height:1.1;">{title}</div>
<div style="margin-top:20px; font-size:28px; opacity:0.85;">{description}</div>
</div>
</div>This is a design starting point, not a guarantee that every browser CSS feature or client-side asset behavior is supported by the image renderer. Test the component’s styles and output in the selected library and hosting runtime.
Return an image from a dynamic SvelteKit route
Place a route at src/routes/og/[slug].png/+server.ts. The route must look up real page data rather than silently creating a generic image for an invalid slug. The following illustrates the route shape; adapt the data lookup, font loader, and exact ImageResponse constructor options to the installed Sveltekit OG version and your project:
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import { ImageResponse } from '@ethercorps/sveltekit-og';
import OgCard from '$lib/OgCard.svelte';
import type { RequestHandler } from './$types';
import { getArticleBySlug } from '$lib/server/articles';
import { loadFont } from '$lib/server/og-font';
export const GET: RequestHandler = async ({ params }) => {
const article = await getArticleBySlug(params.slug);
if (!article) {
return new Response('Not found', { status: 404 });
}
const fontData = await loadFont();
return new ImageResponse(
OgCard,
{
props: {
title: article.title,
description: article.description
},
width: 1200,
height: 630,
fonts: [
{
name: 'Inter',
data: fontData,
weight: 400,
style: 'normal'
}
]
}
);
};getArticleBySlug and loadFont above are application helpers, not SvelteKit or Sveltekit OG built-ins. Implement the former against your content store and have the latter return the font file as raw binary data such as an ArrayBuffer. The library documentation provides font helpers for loading and resolving fonts; follow its current API for the precise font object shape and response options.
The library’s API documentation uses 1200 × 630 pixels in an example. Treat that as the library example’s dimensions, not as a universal platform requirement. Choose dimensions for your target presentation and confirm the renderer produces the expected format and layout.
Point each page’s Open Graph metadata at its image
For a page with slug getting-started, the image endpoint might resolve to https://example.com/og/getting-started.png. Use that full public URL in the page’s metadata. In a SvelteKit page server load, for example, return the URL alongside the page data and render the tags in the page head:
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<script lang="ts">
export let data: {
article: { title: string; description: string; slug: string };
ogImageUrl: string;
};
</script>
<svelte:head>
<meta property="og:title" content={data.article.title} />
<meta property="og:description" content={data.article.description} />
<meta property="og:type" content="article" />
<meta property="og:image" content={data.ogImageUrl} />
</svelte:head>Construct ogImageUrl from the canonical public origin and the encoded slug, or use the canonical URL strategy already established by your application. Check the rendered HTML for the exact page URL: metadata generated only in the browser may not be present when a preview crawler fetches the page. The endpoint and the metadata must agree, and the image route must be reachable without a session or private network access.
Choose runtime generation or build-time prerendering
| Approach | Best fit | What to account for |
|---|---|---|
| Runtime generation | Content or image data that depends on request-time state, or a route set that cannot be enumerated at build time. | The server generates the response when requested. Decide how caching, revalidation, and changes to mutable content should work. No universal performance or cost advantage is established by the library documentation. |
| Build-time prerendering | A finite, known collection of image paths whose source content is available during the build. | Enable prerendering for the route and define the dynamic route entries so the build can produce each image. New or changed content requires a build to update the generated output. |
The library documentation describes export const prerender = true and defining entries for dynamic paths as the build-time pattern. A route that cannot supply its path list and underlying data during the build is not a fit for that pattern without changing how content is provided. The decision is about freshness and whether the build can enumerate the required outputs, not a documented numeric threshold.
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- Fonts: Provide custom fonts as raw binary data, such as an
ArrayBuffer. A browser font declaration alone does not give a server-side image renderer the font file. - Local assets: Browser-relative paths and client assets are not automatically available to server-side rendering. Supply local image data directly, for example as a data URL, or use a public absolute URL accessible to the renderer.
- Renderer support: Verify the component’s CSS, font handling, asset loading, and output format with the chosen image library. Do not assume browser rendering behavior is reproduced.
- Adapter and runtime: SvelteKit adapters convert build output for deployment platforms. Confirm that the selected renderer and its dependencies work in the target adapter and runtime; no provider-by-provider compatibility result is established here.
- Mutable data: Choose cache headers and an invalidation or revalidation approach that matches how often the source page changes. The library material does not establish a single cache policy.
Troubleshoot common failures
The route returns 404 or the wrong card
Check the URL’s slug, the route parameter name, and the content lookup. Return a not-found status when the record is absent instead of generating a plausible but incorrect fallback image. For prerendered routes, confirm the slug is included in the build’s entries and its data is available at build time.
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The image URL works in a browser, but the preview has no image
Inspect the page’s served HTML and confirm og:image contains the exact absolute, publicly reachable image URL. Fetch the image URL without relying on a logged-in browser session, and make sure the endpoint returns an image response rather than an HTML error page. Also check that the page itself exposes its metadata in the HTML delivered to the preview crawler.
The font is missing or text wraps unexpectedly
Confirm the font is loaded as binary data and passed using the library’s current font option format. Check the font family name used by the card, then test long titles and descriptions; dynamic copy can wrap differently from the short sample used during design.
A logo or background image is absent
Replace browser-relative asset paths with data supplied directly to the renderer or an absolute URL it can access. If the asset is remote, verify it is publicly reachable from the rendering environment.
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The route works locally but fails after deployment
Check adapter output and target runtime support for the renderer and its dependencies, then review how the deployment environment resolves font and image assets. SvelteKit’s adapter documentation explains the role of adapters, but the cited materials do not provide a compatibility matrix for individual hosts.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Test the complete share-preview path
- Open a real content page and inspect its served HTML for
og:title,og:description, andog:image. - Copy the image URL from
og:imageand request it directly. Confirm it returns the intended image for that page’s slug. - Try a nonexistent slug and confirm the endpoint returns not found rather than a misleading card.
- Test representative short and long titles, any custom fonts and assets, and the deployed—not just local—route.
- If prerendering, build with the complete intended route set and verify that the generated paths are present in the deployment output.
- Set and test caching behavior according to how quickly page content needs to appear in a regenerated image.
Or skip the browser setup
ScreenshotNeo is a website screenshot API and MCP server, not an Open Graph image-generation library: use the SvelteKit route above when you need a designed, page-specific social card. If you also need a clean screenshot of a rendered web page, one GET request can return an image or PDF:
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpSee the ScreenshotNeo API documentation for parameters and setup. It accepts cookie banners and removes more than 60 known consent platforms, newsletter popups, and chat widgets before capture; each step can be disabled. Bot checks or CAPTCHAs, blank pages, timeouts, failed loads, and cache hits are not billed, and responses identify the page verdict and billing status in headers. Its MCP server includes take_screenshot, get_page_info, and capture_pdf for AI agents. The free plan includes 1,000 shots per month without a card; paid plans start at $5 for 3,000 shots. Sign up for free ScreenshotNeo access.
Frequently Asked Questions
Does SvelteKit generate Open Graph images natively?
The implementation here uses the third-party Sveltekit OG library’s ImageResponse API in a SvelteKit server route; it is not a native SvelteKit image-generation API.
Can I use the same Svelte component for every page’s image?
Yes. Define the card once and pass page-specific title, description, or other data as props when creating each image response.
Does ScreenshotNeo create these dynamic Open Graph cards?
No. ScreenshotNeo captures rendered web pages; use the SvelteKit image route and metadata for designed, page-specific Open Graph cards.
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