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Choose the rendering path first
The correct fix depends on what you are putting in the PDF. There are two different workflows:
| Input and goal | Recommended path | What to expect |
|---|---|---|
| An HTML element containing an inline or image-based SVG | html2canvas(element, options), then add the resulting canvas image to jsPDF |
The result is a raster canvas representation. Unsupported CSS, filters, fonts, or DOM features may differ from the browser. |
| A standalone SVG that you want to place in a PDF | Use jsPDF’s addSvgAsImage SVG module |
This bypasses the surrounding HTML capture. Confirm that your installed jsPDF build exposes the method. |
| An HTML region whose normal rendering misses important presentation details | Test html2canvas with foreignObjectRendering: true |
The option is off by default and is browser-dependent; it is a testable alternative, not a universal SVG fix. |
Capture an HTML region that contains an SVG
1. Make the SVG measurable and visible
Before changing libraries, inspect the actual element. Give the SVG a declared width and height, or a viewBox plus CSS dimensions. Make sure it is not display:none, outside the viewport because of an application state, or dependent on an image, font, stylesheet, mask, filter, or pattern that has not loaded. An SVG that looks correct in the live page can still be missing a referenced resource when the clone is rendered.
<div id="invoice-chart">
<svg width="640" height="360" viewBox="0 0 640 360" role="img" aria-label="Revenue chart">
<!-- paths, text, gradients, masks, and images -->
</svg>
</div>
2. Use the default renderer first
Install the libraries in your application and wait for the SVG’s assets before capturing. The example below captures a DOM element, creates a PNG data URL, and inserts it into a PDF.
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import html2canvas from 'html2canvas';
import { jsPDF } from 'jspdf';
async function exportSvgRegion() {
const element = document.querySelector('#invoice-chart');
if (!element) throw new Error('Missing #invoice-chart');
const canvas = await html2canvas(element, {
backgroundColor: '#ffffff',
imageTimeout: 15000,
onclone: (clonedDocument) => {
// Optional: make export-only changes in the cloned DOM.
const clonedChart = clonedDocument.querySelector('#invoice-chart');
if (clonedChart) clonedChart.style.background = '#ffffff';
}
});
const pdf = new jsPDF({ unit: 'px', format: [canvas.width, canvas.height] });
pdf.addImage(canvas.toDataURL('image/png'), 'PNG', 0, 0, canvas.width, canvas.height);
pdf.save('chart.pdf');
}
html2canvas recreates a DOM representation; it is not a literal browser screenshot. Its documentation therefore cautions that every CSS property must be implemented manually and that full CSS support is not possible. SVG support in the source and support for foreign-object rendering are separate capability checks.
3. Try the alternate renderer deliberately
If the normal route loses SVG presentation that is important to your page, compare it with:
const canvas = await html2canvas(document.querySelector('#invoice-chart'), {
foreignObjectRendering: true,
backgroundColor: '#fff',
imageTimeout: 15000
});
foreignObjectRendering defaults to false. It asks the browser to render more of the cloned HTML through an SVG foreignObject path, but support varies by browser and by the content being embedded. Test the exact SVG, CSS, fonts, and target browsers rather than assuming this option fixes every mismatch.
Handle cross-origin SVGs and referenced images
A canvas becomes tainted when it draws an image that the browser loaded from another origin without permission. A tainted canvas cannot be read with toDataURL() or toBlob(), which commonly appears as a security exception during PDF export. This applies to an external SVG itself and to images referenced inside that SVG.
Use CORS only when the server opts in
const canvas = await html2canvas(element, {
useCORS: true,
imageTimeout: 20000
});
useCORS: true makes the browser request eligible images with CORS, but it cannot grant permission. The image or SVG host must return an appropriate Access-Control-Allow-Origin header for your page. Check the Network panel for the actual response, including redirects; a redirect to a host without CORS headers can still fail.
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Use a same-origin proxy when you control the backend
When the asset host cannot provide CORS headers, proxy the asset through your own origin, validate the destination to avoid an open proxy, preserve the correct content type, and then point the SVG or image at that same-origin URL. html2canvas also exposes a proxy configuration for this situation. Do not assume allowTaint: true makes export readable: it permits drawing but does not make a tainted canvas safe to inspect.
Inline critical SVG data when practical
Inlining the SVG markup and small images as data URLs removes a network-origin dependency. It does not solve unsupported CSS or an SVG that references a missing font, and large data URLs increase document size, so use it selectively.
Add a standalone SVG directly with jsPDF
If you do not need to capture surrounding HTML, direct insertion is a different and often cleaner route. The jsPDF SVG module documents addSvgAsImage. The exact availability depends on the jsPDF version and build you installed, so inspect the exported API before shipping.
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import 'svg2pdf.js'; // Include the SVG support required by your jsPDF setup.
async function svgToPdf(svgElement) {
const pdf = new jsPDF({ unit: 'pt', format: 'a4' });
const svgText = new XMLSerializer().serializeToString(svgElement);
// x, y, width and height are PDF units (points in this example).
pdf.addSvgAsImage(svgText, 40, 40, 515, 290);
pdf.save('standalone.svg.pdf');
}
const svg = document.querySelector('#invoice-chart svg');
if (svg) await svgToPdf(svg);
Use this method when vector-like SVG insertion is more important than reproducing the complete HTML layout. Test gradients, masks, filters, external styles, embedded fonts, text, and image references in the SVG you actually ship. A direct SVG API does not automatically reproduce CSS applied by unrelated page stylesheets.
Control timing, fonts, and export-only styles
Wait for resources before capture
await document.fonts?.ready;
await Promise.all(
[...document.images].map(img => img.complete
? Promise.resolve()
: new Promise(resolve => {
img.addEventListener('load', resolve, { once: true });
img.addEventListener('error', resolve, { once: true });
}))
);
This prevents a common race in which the live page is visible but the cloned document captures before a web font or image has finished. It cannot repair a failed request; inspect the console and Network panel as well.
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Use onclone instead of mutating the live page
In onclone, hide controls, force a white background, remove animations, or set print-specific dimensions in the cloned document. This keeps the user interface unchanged and makes the export deterministic.
Record failures
Set a finite imageTimeout and provide onError while diagnosing:
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const canvas = await html2canvas(element, {
imageTimeout: 15000,
onError: error => console.warn('html2canvas resource error', error)
});
A timeout or callback error points to a loading problem; a completed canvas with the wrong appearance points to a rendering or unsupported-feature problem.
Diagnose the common failure modes
| Symptom | Likely cause | Fix to try |
|---|---|---|
| SVG area is blank | The SVG is hidden, has no usable dimensions, or a referenced resource failed | Check computed dimensions and visibility, wait for assets, and inspect Network and console errors. |
toDataURL throws a security error |
A cross-origin SVG or image tainted the canvas | Use useCORS: true only with server CORS headers, or proxy through your origin. |
| Colors, filters, masks, or layout differ | html2canvas does not implement the relevant CSS or SVG feature | Try foreignObjectRendering: true, simplify export CSS, or use direct addSvgAsImage for a standalone SVG. |
| Text uses a fallback font | Capture ran before the web font loaded or the font is unavailable to the browser | Await document.fonts.ready, confirm the font response, and capture again. |
addSvgAsImage is undefined |
The SVG module is absent from the installed jsPDF build or the API differs by version | Check the installed package and build, include the required SVG module, and verify the method before calling it. |
| Works in Chrome but not Safari or Firefox | Browser support for foreignObject, SVG features, or canvas APIs differs | Test every supported browser with the production SVG; choose a simpler SVG or a server-side route where identical output is required. |
| Node.js throws browser API errors | html2canvas depends on browser APIs and is not a Node.js renderer | Run it in a real browser, or use a browser-based capture service. |
Choose raster capture or direct SVG insertion
- Use html2canvas plus jsPDF when the PDF must match an HTML card, dashboard, or invoice region that includes more than the SVG. Accept that the canvas stage rasterizes the result and that unsupported CSS may change.
- Use
foreignObjectRenderingwhen the default renderer misses presentation that the browser can render, and only after testing your target browsers. - Use
addSvgAsImagewhen the input is the SVG itself and you want to avoid capturing unrelated HTML. Verify the module and test the SVG’s actual dependencies.
Performance, reliability, and PDF quality
Large full-page captures consume memory because html2canvas builds a bitmap whose cost grows with pixel dimensions and device scale. Capture the smallest element that answers the user’s need, avoid unnecessarily high scale values, and release temporary canvases after adding them to the PDF. For long pages, capture deliberate sections and place them on separate PDF pages rather than creating one enormous bitmap.
PNG preserves sharp text and transparent details but can produce larger files. JPEG is smaller for photographic content but introduces compression artifacts and does not preserve transparency. The PDF page size and image dimensions should be chosen together; stretching a small canvas to fill a page cannot restore lost detail.
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For production reliability, test cold loads as well as cached loads, slow networks, failed image requests, consent states, dark mode, web fonts, and each browser you support. Keep a small fixture page containing the SVG features your application relies on so library upgrades can be compared before deployment.
Or skip the browser setup
If you need a clean website screenshot rather than a browser-side SVG debugging workflow, ScreenshotNeo provides a GET-based screenshot API and an MCP server for AI agents. It accepts consent banners before capture and removes more than 60 known consent platforms, newsletter popups, and chat widgets; each step can be disabled. Bot checks, CAPTCHAs, blank pages, timeouts, failed loads, and cache hits are not billed, and the response identifies the page verdict and billing status in X-Page-Verdict and X-Billed headers.
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 capture options such as full-page lazy-image loading, CSS-selector element capture, dark mode, device presets, custom viewport and retina scale, PDF output, custom CSS and JavaScript, clicks, waits, request blocking, headers, cookies, user agents, timezone, geolocation, transparent backgrounds, resizing, TTL caching, signed image links, asynchronous webhooks, bulk capture, usage reporting, and the OpenAPI specification. Its parameter names are compatible with those used by many screenshot APIs, which can simplify migration.
import requests
r = requests.get("https://api.screenshotneo.com/v1/shot", params={"access_key": "YOUR_API_KEY", "url": "https://stripe.com"}, timeout=90)
r.raise_for_status()
open("shot.webp", "wb").write(r.content)
const q = new URLSearchParams({ access_key: 'YOUR_API_KEY', url: 'https://stripe.com' });
const res = await fetch(`https://api.screenshotneo.com/v1/shot?${q}`);
if (!res.ok) throw new Error(`Screenshot failed: ${res.status}`);
An MCP server supplies take_screenshot, get_page_info, and capture_pdf tools to Claude, Cursor, and other MCP clients. The Free plan includes 1,000 screenshots per month with no card; paid plans start at $5 for 3,000 shots, and every feature is available on every plan. Create a free ScreenshotNeo account.
FAQ
Does html2canvas preserve SVG as vector data?
No. When you capture an HTML region, html2canvas paints a canvas representation; adding that canvas to jsPDF is an image workflow. Use the SVG-specific jsPDF method when direct SVG insertion is the goal.
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Will foreignObjectRendering always fix an SVG?
No. It is disabled by default and depends on browser support and the exact SVG, CSS, and external resources. Treat it as a controlled comparison.
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Can allowTaint: true solve cross-origin export errors?
No. It does not make a tainted canvas readable. Configure CORS correctly or use a same-origin proxy.
Can I run html2canvas in a Node.js script without a browser?
Not directly. html2canvas depends on browser APIs; use a real browser environment or a browser-based screenshot service.
Frequently Asked Questions
Should I use PNG or JPEG for the PDF image?
PNG is the safer default for charts, text, transparency, and sharp edges. JPEG can reduce size for photographic content but loses transparency and introduces compression.
Why does the SVG look correct on screen but not in the PDF?
The live browser and html2canvas’s reconstructed DOM do not use identical rendering paths. Unsupported CSS or SVG features, missing fonts, failed external resources, and cross-origin restrictions are the usual differences.
Quick Recap
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