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Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Repair Windows errors before they cause bigger problemsFix Now →To stop html2pdf.js from downloading immediately, do not call .save() (or .saveAs()). Build the document through .toPdf(), then consume it with .output('blob'), .outputPdf('blob'), or another jsPDF output type. The returned Promise gives your application the PDF data for an inline preview, a new tab, an upload, or a later download button.
const element = document.getElementById('element-to-print');
html2pdf()
.from(element)
.toPdf()
.output('blob')
.then((blob) => {
const url = URL.createObjectURL(blob);
document.querySelector('#pdf-preview').src = url;
});Why html2pdf.js downloads by default
The convenience call html2pdf(element) follows the library’s save-oriented workflow and prompts the visitor to save the generated PDF. The documented Worker sequence is .from() → .toContainer() → .toCanvas() → .toImg() → .toPdf() → .save(). The final save stage, not PDF generation itself, creates the browser download prompt.
saveAs() is an alias for save(), so changing the filename or switching between those two methods does not make the operation silent. A filename option also only names a file; it does not initiate a download on its own.
Use an output method instead of .save()
Stop the chain after .toPdf() and choose an output that matches what your application needs. html2pdf.js exposes outputPdf(type, options), which forwards to jsPDF’s output method and returns a Promise. The shorter output(type, options) form is also available; export is an alias for output.
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| Goal | Pattern | Result |
|---|---|---|
| Preview or upload binary data | .output('blob') or .outputPdf('blob') |
A Promise resolving to a Blob |
| Open or pass around encoded data | An appropriate jsPDF output type through output |
Data in the format selected for that jsPDF output |
| Let the browser prompt for a file | .save('name.pdf') |
User download prompt |
The important control boundary is whether your code calls save. Generation can complete successfully without any download at all.
Show the PDF inside the page
A Blob URL lets an iframe or embed element display the PDF without creating an anchor with a download attribute.
const element = document.getElementById('element-to-print');
const preview = document.getElementById('pdf-preview');
html2pdf()
.from(element)
.toPdf()
.outputPdf('blob')
.then((blob) => {
const objectUrl = URL.createObjectURL(blob);
preview.src = objectUrl;
preview.dataset.objectUrl = objectUrl;
})
.catch((error) => {
console.error('PDF generation failed:', error);
});Use markup such as <iframe id='pdf-preview' title='PDF preview'></iframe>. Keep the object URL while the preview is visible. When the preview is removed or replaced, call URL.revokeObjectURL(preview.dataset.objectUrl) so the browser can release that Blob URL.
Open a preview in a new tab without popup-blocker surprises
Browsers generally allow a new window only when it is opened synchronously inside a user-initiated event. Open a placeholder tab in the click handler, then perform the asynchronous conversion and navigate that tab after the Blob is ready.
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document.getElementById('preview-button').addEventListener('click', () => {
const tab = window.open('about:blank', '_blank');
if (!tab) {
alert('Allow pop-ups for this site to preview the PDF.');
return;
}
const element = document.getElementById('element-to-print');
html2pdf()
.from(element)
.toPdf()
.output('blob')
.then((blob) => {
const objectUrl = URL.createObjectURL(blob);
tab.location.href = objectUrl;
})
.catch((error) => {
tab.close();
console.error('PDF generation failed:', error);
});
});If you call window.open() only after the Promise resolves, a popup blocker may reject it. A new tab also has its own object-URL lifetime; revoke the URL when your application no longer needs it, while avoiding revocation before the tab has loaded the document.
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Upload the PDF instead of downloading it
For an application workflow, send the Blob directly to your server. This keeps the file in memory and avoids creating a download link.
async function createAndUploadPdf() {
const element = document.getElementById('element-to-print');
const blob = await html2pdf()
.from(element)
.toPdf()
.outputPdf('blob');
const form = new FormData();
form.append('document', blob, 'generated.pdf');
const response = await fetch('/api/documents', {
method: 'POST',
body: form
});
if (!response.ok) {
throw new Error(`Upload failed: ${response.status}`);
}
return response.json();
}Use your server’s authentication and size limits as usual. The browser does not need an <a download> element for this path.
A complete silent-generation helper
Wrapping the chain in a function gives callers a predictable Promise and leaves the final presentation decision to the UI.
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function renderPdfBlob(element, options = {}) {
return html2pdf()
.set(options)
.from(element)
.toPdf()
.outputPdf('blob');
}
document.getElementById('make-preview').addEventListener('click', async () => {
const preview = document.getElementById('pdf-preview');
const oldUrl = preview.dataset.objectUrl;
if (oldUrl) URL.revokeObjectURL(oldUrl);
try {
const blob = await renderPdfBlob(
document.getElementById('element-to-print'),
{
filename: 'report.pdf',
margin: 10,
image: { type: 'jpeg', quality: 0.95 },
html2canvas: { scale: 2 },
jsPDF: { unit: 'mm', format: 'a4', orientation: 'portrait' }
}
);
const objectUrl = URL.createObjectURL(blob);
preview.dataset.objectUrl = objectUrl;
preview.src = objectUrl;
} catch (error) {
console.error(error);
}
});The filename setting remains useful if you later add an explicit download button, but it does not change the silent behavior of this helper.
What does not prevent the download
- Changing
filenameonly changes the suggested name. - Changing
image,html2canvas, orjsPDFoptions changes rendering or PDF settings, not the save behavior. - Replacing
save()withsaveAs()still invokes the same download prompt. - Calling
output()and then later calling application code that creates an<a download>element and clicks it will still download the file. Remove that separate code if you want a completely silent flow.
Troubleshooting automatic downloads
The PDF still downloads after removing .save()
Search the whole codebase for html2pdf(, .save(, and .saveAs(). A second conversion path, a shared helper, or a button handler may still use the convenience call. Also search for download, dynamically created anchors, and programmatic click() calls.
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The preview is blank
First verify that the Promise resolved and that the Blob has a PDF MIME type. Then inspect the iframe or embed source and browser console. A blank preview is a rendering or browser-display issue, not evidence that .output('blob') triggered a download. Test the html2canvas and jsPDF portions separately before changing download handling.
The new tab is blocked
Open it synchronously in the user-event handler, before starting the asynchronous html2pdf.js chain. If window.open() returns a falsy value, tell the user to allow pop-ups or fall back to an inline preview.
An upload fails while preview works
Check the server’s multipart field name, authentication, request-size limit, and response status. Append the Blob to FormData with an explicit filename and do not manually set the multipart boundary header; the browser sets it correctly.
Content is missing or looks different
html2pdf.js is client-side software that uses html2canvas and jsPDF. The rendered page is placed into an image in the PDF, so text may not be selectable or searchable and files can be larger than a text-native PDF. Cloning, resizing, canvas-size, Promise, and other rendering limitations can affect the result. Fix layout, cross-origin assets, and canvas constraints independently of the download decision.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Choose the right browser behavior
| Desired experience | Implementation | Browser consideration |
|---|---|---|
| Silent generation for later processing | Resolve output('blob') and keep the Blob in application state |
Manage memory for large documents |
| Inline review | Create an object URL and assign it to an iframe or embed | Revoke the URL when the preview is discarded |
| Separate tab | Open a placeholder during the click, then assign the object URL | Opening after asynchronous work can trigger popup blocking |
| Explicit user download | Call save() only from the download button |
The prompt occurs by design |
Or skip the browser setup
If your actual requirement is a screenshot or PDF of a URL rather than a PDF assembled from the current browser DOM, ScreenshotNeo provides a one-request API. It is not a replacement for html2pdf.js when you must capture unsaved client-side state, but it avoids shipping browser-rendering code to your users.
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See the parameter reference in the ScreenshotNeo documentation. A basic image request with cURL is:
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpThe same request in Python:
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}`);ScreenshotNeo accepts PNG, JPEG, WebP, or PDF output and can handle full-page captures, lazy images, CSS-selector element captures, device and viewport settings, dark mode, custom CSS and JavaScript, waits, request blocking, headers, cookies, user agents, authorization, timezone, geolocation, resizing, caching, signed links, asynchronous jobs, webhooks, bulk capture, and usage reporting. Its cleanup step accepts cookie or consent banners and removes more than 60 known consent platforms, newsletter popups, and chat widgets; each step can be disabled.
Only clean shots are billed. Bot checks or CAPTCHAs, blank pages, timeouts, failed loads, and cache hits cost nothing, and each response identifies the result with X-Page-Verdict and X-Billed headers. An MCP server exposes take_screenshot, get_page_info, and capture_pdf to Claude, Cursor, and other MCP clients.
The Free plan includes 1,000 shots per month with no card. Paid plans start at $5 for 3,000 shots; yearly billing gives two months free, and every feature is included on every plan. Create a free ScreenshotNeo account to try it without a card.
Frequently Asked Questions
Can I keep a generated PDF for a later download?
Yes. Store the resolved Blob or its object URL in your application state, then call save() only when the user presses an explicit download control.
Does html2pdf.js run as a Node.js PDF service?
No. html2pdf.js is client-side browser software built around html2canvas and jsPDF. A server-side workflow needs a different rendering service or browser automation stack.
Why is text in my PDF not selectable?
html2pdf.js places rendered content into an image in the PDF. Image-based output can therefore lose text selection and searchability and may produce larger files.
Quick Recap
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