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Use @ethercorps/sveltekit-og in a SvelteKit +server.ts route when you are generating an image from a template or HTML string. Use a browser-side capture library such as SnapDOM when you must reproduce an already-rendered element, including its computed styles and current state. Use Playwright or a screenshot API when the page depends on browser JavaScript or full-page behavior. SvelteKit server rendering has no browser layout to capture, so the correct approach depends on where the source HTML exists and how faithfully it must be rendered.
Choose the rendering path first
There are three distinct jobs that are often described as “converting HTML to PNG.” Pick the one that matches your input:
| Need | Recommended path | What it does | Main limitation |
|---|---|---|---|
| A deterministic card from a template or raw HTML | @ethercorps/sveltekit-og and ImageResponse |
Runs in a server or edge-style runtime; Satori converts supported HTML/CSS to SVG and Resvg rasterizes it to PNG or JPEG. | It is not a complete browser engine. Unsupported CSS and JavaScript-dependent layout will not behave like Chrome. |
| An element already mounted in the browser | SnapDOM from an event handler or onMount |
Captures the browser’s computed styles, loaded assets and interactive state. | It cannot run during SSR, and you must wait for data, images, fonts and transitions. |
| A page whose output depends on JavaScript, navigation or browser APIs | Playwright or a screenshot service | Launches a real browser and can wait for selectors, network activity and application state. | Browser runtimes add deployment, memory and startup cost. |
For Open Graph cards, deterministic server rendering is usually the shortest route. For a “save exactly what the user sees” button, capture the mounted DOM. For an entire third-party page, use a browser runtime or an API.
Generate a PNG on the server with SvelteKit OG
Install the package
From your SvelteKit project, install the renderer:
npm install @ethercorps/sveltekit-ogThe package exposes ImageResponse, which can be returned directly from a SvelteKit server endpoint.
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Minimal raw-HTML endpoint
Create src/routes/og/+server.ts. This example returns a 1,200 × 630 image, the dimensions used in the project’s documented example:
import type { RequestHandler } from '@sveltejs/kit';
import { ImageResponse } from '@ethercorps/sveltekit-og';
const html = `
<div style="display:flex;align-items:center;justify-content:center;
width:100%;height:100%;background:#101011;color:#ddd;
font-family:Arial,sans-serif">
<h1 style="font-size:64px">Hello from SvelteKit</h1>
</div>
`;
export const GET: RequestHandler = async () =>
new ImageResponse(html, { width: 1200, height: 630 });Run the development server and request /og. The response is an image, so it can be used directly as an Open Graph URL or saved by a client. Keep the root element at 100% width and height; otherwise the layout may not fill the output canvas.
Render a Svelte component
When the design is easier to maintain as a component, import that component and pass it as the first argument:
// src/routes/og/+server.ts
import type { RequestHandler } from '@sveltejs/kit';
import { ImageResponse } from '@ethercorps/sveltekit-og';
import Card from '$lib/Card.svelte';
export const GET: RequestHandler = async ({ url }) => {
const title = url.searchParams.get('title') ?? 'SvelteKit';
return new ImageResponse(
{ component: Card, props: { title } },
{ width: 1200, height: 630 }
);
};Make the component root define width: 100% and height: 100%. If the component uses a <style> block, inject that CSS into the image-rendering path as required by the package’s component guide; ordinary browser stylesheets are not automatically available to a server renderer.
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Accept dynamic data safely
Query parameters make the endpoint useful for per-article cards, but they also make it an untrusted input boundary. Validate length and allowed values before inserting text into the template. Escape user-provided strings if you build raw HTML, or pass them as component props. Keep the endpoint dynamic when titles or user data arrive at request time; do not prerender a route whose image changes for every request.
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Capture the exact rendered Svelte element in the browser
Use this path for a download button, a dashboard tile, or any case where CSS, loaded fonts, animations and current UI state matter. Call SnapDOM from an event handler or inside onMount. SvelteKit can render a page on the server, but there is no browser layout there to capture.
Wait for the visual state, not only Svelte’s DOM update
tick() waits for pending Svelte DOM updates. It does not wait for a fetch request, image decoding, web-font loading or a transition. Await each of those operations before invoking the capture library.
<script lang="ts">
import { onMount, tick } from 'svelte';
// Import SnapDOM according to the version installed in your project.
import { snapdom } from 'snapdom';
let card: HTMLDivElement;
let ready = false;
onMount(async () => {
await loadCardData();
await tick();
await document.fonts.ready;
await Promise.all(
Array.from(card.querySelectorAll('img')).map((img) =>
img.complete
? Promise.resolve()
: new Promise((resolve) => {
img.addEventListener('load', resolve, { once: true });
img.addEventListener('error', resolve, { once: true });
})
)
);
ready = true;
});
async function saveCard() {
if (!ready) return;
const result = await snapdom(card);
const blob = await result.toBlob();
const href = URL.createObjectURL(blob);
const a = document.createElement('a');
a.href = href;
a.download = 'card.png';
a.click();
URL.revokeObjectURL(href);
}
async function loadCardData() {
// Replace with your fetch and state assignment.
}
</script>
<div bind:this={card} class="card">...</div>
<button disabled={!ready} on:click={saveCard}>Download PNG</button>Keep capture-only styles on the element or in a class that is present when the capture runs. If the design contains a transition, wait for its completion or temporarily disable it; otherwise the image can contain an intermediate frame. Cross-origin images may require appropriate CORS headers or embedding as data URLs.
Use a headless browser when JavaScript is part of the image
Server-side Satori/Resvg is intentionally browser-free and efficient, but it does not execute application JavaScript or implement every CSS feature. A browser capture is the safer choice for charts that render after hydration, pages that require interaction, and layouts depending on browser APIs.
// scripts/capture.mjs
import { chromium } from 'playwright';
const browser = await chromium.launch();
const page = await browser.newPage({ viewport: { width: 1200, height: 630 }, deviceScaleFactor: 2 });
await page.goto('http://localhost:5173/share-card', { waitUntil: 'networkidle' });
await page.waitForSelector('[data-capture-ready="true"]');
await page.screenshot({ path: 'share-card.png', fullPage: false });
await browser.close();Install Playwright and its browser binaries in the environment that runs this script. Serverless platforms may not include those binaries or permit the required system libraries, so confirm the deployment runtime before committing to this design.
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Make assets and fonts deterministic
- Server images: do not assume a browser-relative path such as
./logo.pngexists. Import small local images as Vite inline data URLs, convert larger files to data URLs or ArrayBuffers when appropriate, or provide a public absolute URL. - Fonts: load the exact font files explicitly before rendering. A fallback font changes line breaks and can move every element in the card.
- Remote images: ensure the renderer can reach them at request time. A private URL, expiring URL or blocked host produces a missing image.
- CSS: test flexbox, gradients, filters, grid and other advanced rules in the actual renderer. “Valid CSS” does not guarantee support in Satori’s subset.
Prerender, cache or render per request
Prerender stable cards
Set export const prerender = true when all image inputs are known at build time. SvelteKit can generate those images during the build, which removes request-time rendering.
Keep changing cards dynamic
Use a normal +server.ts request handler for titles, prices, user names or other values that change after deployment. Validate parameters and return an appropriate error instead of producing a misleading fallback image.
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Open Graph crawlers and social previews may request the same URL repeatedly. Cache by a stable key containing every visual input and the renderer version. Invalidate the key when the template, font or asset changes; otherwise an old image can survive a content update.
Common failures and fixes
| Symptom | Likely cause | Fix |
|---|---|---|
| Blank or transparent output | The root has no dimensions or the background is transparent. | Set explicit width and height on the root and a background color when transparency is not intended. |
| Text wraps differently from the browser | Missing font or a renderer-supported CSS difference. | Embed/load the intended font and simplify unsupported layout rules; compare the output in the target runtime. |
| Logo or photo is missing server-side | A relative path or inaccessible remote URL. | Use a Vite data URL, an ArrayBuffer/data URL, or a reachable absolute URL. |
| Capture runs before content appears | tick() completed, but fetches, images, fonts or transitions did not. |
Await the data promise, document.fonts.ready, image load events and transition completion. |
| Works locally, fails in deployment | The adapter cannot launch a browser, lacks binaries, or has different network access. | Use the browser-free OG path where possible, or verify Playwright binaries, libraries and outbound access in the deployment environment. |
| Dynamic route serves stale artwork | A prerendered or overly broad cache key. | Remove prerendering for changing inputs and include every visual parameter in the cache key. |
Or skip the browser setup
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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 response handling. The same request in Python:
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import requests
r = requests.get("https://api.screenshotneo.com/v1/shot", params={"access_key": "YOUR_API_KEY", "url": "https://stripe.com"}, timeout=90)
open("shot.webp", "wb").write(r.content)And in Node.js:
const q = new URLSearchParams({ access_key: 'YOUR_API_KEY', url: 'https://stripe.com' });
const res = await fetch(`https://api.screenshotneo.com/v1/shot?${q}`);
const buffer = Buffer.from(await res.arrayBuffer());
await import('node:fs/promises').then(fs => fs.writeFile('shot.webp', buffer));For SvelteKit cards that must match a browser exactly, use ScreenshotNeo’s controls for full-page capture with lazy images loaded, CSS-selector element capture, dark mode, 12 device presets or a custom viewport, retina scale, PDF paper size/margins/landscape/page ranges, custom CSS and JavaScript, click-before-capture, hide selectors, waits for a selector, delay or network idle, ad/tracker/request/resource blocking, custom headers/cookies/user agent/Authorization, timezone and geolocation, transparent backgrounds, image resizing, chosen cache TTL, signed links for public <img> tags, asynchronous jobs with signed webhooks, bulk capture of up to 100 URLs per call, a usage API and an OpenAPI specification. Parameter names used by other screenshot APIs also work, which eases migration. An MCP server provides take_screenshot, get_page_info and capture_pdf tools for Claude, Cursor and other MCP clients.
The Free plan includes 1,000 shots per month with no card. Paid plans are Starter $5 for 3,000, Growth $15 for 15,000, Pro $39 for 60,000, Scale $99 for 250,000 and Business $249 for 1,000,000; yearly billing gives two months free, and every feature is on every plan. Create a free ScreenshotNeo account to start.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.FAQ
Can SvelteKit convert arbitrary HTML to an image during SSR?
Only through a renderer such as SvelteKit OG. SSR itself creates HTML; it does not provide a browser layout or pixels.
Should an Open Graph endpoint be prerendered?
Prerender it when every input is fixed at build time. Keep it request-time when titles or other visual data change.
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Satori supports a defined HTML/CSS subset and does not execute browser JavaScript. Use a browser capture for full layout fidelity.
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What must be ready before a browser capture?
Wait for Svelte updates, application data, image decoding, web fonts and any transitions that affect the final frame.
Frequently Asked Questions
Can I return JPEG instead of PNG?
Yes. Use the image format supported by the renderer or screenshot service you select, and verify that your response headers and file extension match the returned bytes.
How do I capture only one Svelte element?
Bind the element with Svelte’s bind:this and pass that DOM node to your browser capture library, or use a screenshot API’s CSS-selector capture option.
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No. It is the documented example size; choose dimensions that fit the social destination and your design.
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