For a server endpoint that turns a template or raw HTML into an image, use @ethercorps/sveltekit-og and return an ImageResponse from a SvelteKit +server.ts route. If you need to capture the exact layout already rendered in a browser—including computed styles, loaded assets, or interactive state—use a browser-side DOM capture library such as SnapDOM after the page has mounted. Choose a headless browser or screenshot service when the page depends on browser JavaScript or full page-level rendering.
Choose the rendering path that matches your HTML
“Convert HTML to an image” can mean two different things: render a template as an image on the server, or take a snapshot of a page that a browser has already rendered. The distinction matters in SvelteKit because server-side rendering does not create browser layout, while browser capture needs a mounted DOM.
| What you need | Approach | Main trade-off |
|---|---|---|
| A predictable image from a template or HTML string | @ethercorps/sveltekit-og in a +server.ts endpoint |
Uses a supported HTML/CSS subset, not a full browser engine |
| A snapshot of a mounted Svelte element and its current browser state | A DOM capture library such as SnapDOM, called in the browser | You must wait for asynchronous content and assets to be ready |
| Browser JavaScript execution or page-level fidelity | Playwright or a screenshot service | Requires a browser-capable runtime and adds operational complexity |
For static Open Graph cards, social graphics, or other repeatable layouts, start with server-side generation. For a user-triggered screenshot of a component already on screen, capture that DOM in the browser. If choosing a headless browser, verify that the SvelteKit deployment environment can run it before building around it.
Generate a PNG from HTML in a SvelteKit endpoint
The @ethercorps/sveltekit-og approach accepts either an HTML string or a Svelte component through ImageResponse. Put the endpoint at src/routes/og/+server.ts. This example returns a 1200 × 630 image; those dimensions are an implementation example, not a requirement for every image.
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// src/routes/og/+server.ts
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"><h1>Hello</h1></div>`;
export const GET: RequestHandler = async () =>
new ImageResponse(html, { width: 1200, height: 630 });Request the route in a browser or with an HTTP client to retrieve the generated image. The route itself is the image response, so you can use its URL where an image URL is needed. Change the HTML, styles, and dimensions to match the design. Keep the root element sized to the output canvas so its contents have a defined layout.
Render a Svelte component instead
When the design is naturally expressed as a Svelte component, import it and pass the component as the first ImageResponse argument. The component root should set width: 100% and height: 100%. If component styling is defined in style blocks, the SvelteKit OG guide notes that the styles need to be injected for the renderer to use them. Avoid assuming that ordinary browser CSS behavior is available: the rendering pipeline supports a subset of HTML and CSS.
Make the endpoint dynamic only when the input needs to be
A request-time endpoint is useful when its output depends on a title, user, or other changing value. Keep such inputs controlled: if your route accepts query parameters, validate and escape values before including them in HTML. Do not let untrusted input become arbitrary markup or CSS. Stable images with inputs known at build time can instead be generated through SvelteKit prerendering by setting export const prerender = true; the documented prerender pattern creates OG images from route data during the build.
When server-side rendering is not a browser screenshot
SvelteKit OG uses Satori to convert supported HTML and CSS—including supported flexbox and Tailwind styling—into SVG, then Resvg to rasterize it to PNG or JPEG. This browser-free pipeline avoids launching Puppeteer or Playwright, which can suit deterministic image cards and serverless or edge environments. It is not equivalent to rendering a page in Chrome or Firefox: unsupported CSS, browser-only behavior, and JavaScript-dependent content need a different route or a separate test.
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- Use server-side generation when you control the markup and can design within the renderer’s supported layout and style capabilities.
- Use a browser capture approach when fidelity depends on computed browser styles, a particular mounted state, or content produced by client-side JavaScript.
- Check deployment constraints before adopting Playwright or another headless-browser setup; the runtime must be able to launch and operate the browser.
Capture an already-rendered Svelte element in the browser
For DOM capture, run the capture code from a browser event handler or onMount, not during server rendering. SnapDOM’s Svelte guidance emphasizes that SvelteKit may render a page on the server, but no browser layout exists there to capture. A minimal pattern is to keep a reference to the element and invoke the library after it exists:
<script lang="ts">
import { onMount, tick } from 'svelte';
import { snapdom } from 'snapdom';
let card: HTMLElement;
let imageUrl = '';
async function capture() {
await tick();
const result = await snapdom(card);
imageUrl = await result.toPng();
}
</script>
<div bind:this={card}>
<h1>A rendered Svelte card</h1>
</div>
<button on:click={capture}>Capture image</button>
{#if imageUrl}
<img src={imageUrl} alt="Captured card" />
{/if}Confirm the installed SnapDOM version’s import and output method against its current package documentation before using this illustrative pattern in production; the research source establishes the capture timing requirements, not a guaranteed version-specific API signature. If your application supports a current Svelte event syntax rather than on:click, use the syntax for that Svelte version.
Wait for the actual content, not just Svelte’s DOM update
tick() waits for pending Svelte DOM updates. It does not wait for a network request, image decoding, web font loading, or a transition to finish. If the target contains any of those, make the capture action wait for each relevant operation. For example, load the data before enabling the capture button, wait for image decode promises, and ensure fonts are ready before capturing. A capture that begins too early may succeed but omit an image, use fallback typography, or represent an intermediate state.
Keep this path client-only. If the capture button can be reached before the element is mounted, disable it until the target exists. For a component that appears after navigation or conditional rendering, capture only once that condition is satisfied.
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Server renderers cannot rely on browser-relative asset paths such as ./logo.png being available by default. For a small local image, the SvelteKit OG asset guidance recommends importing it through Vite as an inline data URL. For larger assets, convert them to a data URL or ArrayBuffer when appropriate, or provide an absolute public URL that the renderer can access.
- Prefer embedded or absolute image sources for server-generated output; do not assume a browser-relative path resolves in the renderer.
- Load fonts explicitly when consistent typography matters, and make sure the font data is available before rendering.
- For browser capture, wait for loaded images and web fonts as well as data-driven content; DOM insertion alone does not mean the visual result is ready.
- Test the actual production asset URLs and renderer environment, especially if development uses a local server or assets that are not publicly reachable.
Prerender or generate on each request?
Use prerendering when every image input is known during the build and the output can remain fixed until the next deployment. Use a dynamic endpoint when a request supplies changing content, such as a title or user-specific data. This is the same distinction as build-time versus request-time generation: prerendering can avoid rendering the same stable image on every request, while a runtime route can reflect current input.
SvelteKit route options control whether a page is server-rendered, client-rendered, or prerendered; a +server.ts file provides request-handler logic. Decide where the data becomes available as well as when the image is needed. Data that only exists after a browser interaction cannot be baked into a build-time image without changing the design or moving that data to a server-accessible source.
Or skip the browser setup
If the page you need to capture is reachable by URL, ScreenshotNeo can return a screenshot through one GET request. It is a URL screenshot API, so it captures a served page rather than accepting an unsaved Svelte component or arbitrary HTML string. Put the HTML or Svelte view behind a route first, then request that route. The ScreenshotNeo documentation covers the API options.
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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.webpAdapt the target URL to your publicly reachable SvelteKit page. ScreenshotNeo accepts cookie or consent banners like a visitor and removes more than 60 known consent platforms, newsletter popups, and chat widgets before capture; each of those steps can be turned off. Bot checks or CAPTCHAs, blank pages, timeouts, failed loads, and cache hits cost nothing, and the response identifies the page verdict and billing status in X-Page-Verdict and X-Billed headers. Its MCP server provides take_screenshot, get_page_info, and capture_pdf for AI agents and MCP clients such as Claude and Cursor. The Free plan includes 1,000 shots per month with no card; paid plans start at $5 for 3,000 shots, and every feature is on every plan.
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Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Troubleshooting common failures
The endpoint fails during server rendering
Check whether the code is trying to access browser-only globals or capture a DOM during a server request. Server-side generation should pass markup or a component to ImageResponse; browser DOM capture belongs in onMount or an event handler.
The output omits styles or has a different layout
The server-side renderer supports a subset of CSS, not the full browser layout engine. Reduce the design to supported styles, verify the component’s root dimensions, and test complex effects separately. If exact browser rendering is essential, use browser capture or a headless-browser path instead.
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An image or logo is missing
For server output, replace an assumed relative path with an embedded data URL or an accessible absolute URL. For browser capture, verify the asset request succeeded and wait for the image to decode before capturing.
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Fonts or dynamic content appear incomplete
Make the required font data available to the server renderer. In the browser, wait for fonts, fetches, images, and transitions explicitly; tick() only covers pending Svelte DOM updates.
The image differs between build and runtime
Confirm whether the endpoint is prerendered or generated per request. Prerendering reflects build-time data; changing inputs need a runtime endpoint. Also verify that the production runtime can reach external assets used during generation.
A browser-capture package cannot run in the deployment
Validate the host’s browser-runtime support before relying on Playwright or a similar tool. If the deployment cannot launch a browser, use the browser-free Satori/Resvg route for a compatible template, or capture a public page through a screenshot service.
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Can I create a SvelteKit image without starting a browser?
Yes. A SvelteKit OG endpoint can render supported markup through Satori and Resvg, rather than launching a headless browser.
Can an image route return JPEG instead of PNG?
The SvelteKit OG documentation describes ImageResponse output as PNG or JPEG; choose the format supported by the library’s API for your implementation.
Can I use this for a social preview image?
Yes. A generated image route can serve a stable or dynamic preview image; choose build-time prerendering for fixed inputs and request-time generation for changing inputs.
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