Downloading a PDF generated from HTML has two separate parts: first create valid PDF bytes, then deliver those bytes as a download. If the PDF already exists at a same-origin URL, use an anchor with the download attribute. If JavaScript creates the PDF in memory, wrap the bytes in a Blob and download its object URL. If a server or hosted API creates it, return the bytes with Content-Type: application/pdf and, when appropriate, Content-Disposition: attachment.
1. Download an existing PDF file
When your application already serves a PDF, the simplest implementation is a normal link:
<a href="/reports/report.pdf" download="report.pdf">Download PDF</a>The download attribute is a browser hint that suggests downloading the resource and provides a filename. It works for same-origin URLs and for blob: and data: URLs, but it is not a reliable way to force downloads from arbitrary cross-origin URLs. Browser settings can still open the PDF, prompt the user, or save it automatically. A server response with Content-Disposition may provide the final filename instead of the HTML value. See the MDN anchor documentation for the documented rules.
Server headers for an attachment
If you control the endpoint, return real PDF bytes and set headers such as:
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Content-Type: application/pdf
Content-Disposition: attachment; filename="report.pdf"Use inline instead of attachment when you want the browser to display the PDF where supported. Headers do not convert HTML into a PDF: the response body must already be a valid PDF produced by a converter or renderer.
2. Download PDF bytes generated in the browser
Client-side libraries commonly return a Blob, an ArrayBuffer, or a byte array. Convert the result to a Blob with the PDF MIME type, create an object URL, and assign that URL to a temporary link.
async function downloadPdf(pdfBytes, filename = "report.pdf") {
const blob = new Blob([pdfBytes], { type: "application/pdf" });
const url = URL.createObjectURL(blob);
const link = document.createElement("a");
link.href = url;
link.download = filename;
link.textContent = "Download PDF";
document.body.appendChild(link);
link.click();
link.remove();
URL.revokeObjectURL(url);
}Call this only with bytes from an actual PDF generator. Giving HTML text a PDF filename or MIME type does not create a readable PDF. For asynchronous generation, run the function from a user-initiated button, show progress, and catch generation errors. Test the object-URL lifecycle in the browsers and deployment context you support; applications that remove links immediately can behave differently, so do not assume one revocation delay works everywhere.
Using html2pdf.js
html2pdf.js converts a webpage or selected element in the browser and documents a save flow. It runs in a browser, not Node.js. Install it with npm or include a deliberately pinned CDN version rather than an unversioned asset:
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npm install html2pdf.jsimport html2pdf from "html2pdf.js";
const element = document.querySelector("#invoice");
await html2pdf().set({
margin: 12,
filename: "invoice.pdf",
image: { type: "jpeg", quality: 0.95 },
html2canvas: { scale: 2 },
jsPDF: { unit: "mm", format: "a4", orientation: "portrait" }
}).from(element).save();Client conversion is convenient for a browser-only feature, but output depends on browser rendering, page-break behavior, fonts, image access, and the library’s supported options. It also exposes the source document and any client-side data to the user’s browser.
3. Generate and download on a server with Puppeteer
Server-side rendering gives you control over navigation, readiness, print settings, credentials, and secrets. Puppeteer’s guide uses page.goto() followed by page.pdf(); its PDF method waits for fonts by default, and the documented example waits for networkidle2.
import express from "express";
import puppeteer from "puppeteer";
const app = express();
app.use(express.json({ limit: "2mb" }));
app.post("/report.pdf", async (req, res) => {
const browser = await puppeteer.launch({ headless: true });
try {
const page = await browser.newPage();
await page.setContent(req.body.html, { waitUntil: "networkidle2" });
await page.emulateMediaType("print");
const pdfBytes = await page.pdf({
format: "A4",
printBackground: true,
margin: { top: "16mm", right: "14mm", bottom: "16mm", left: "14mm" }
});
res.set({
"Content-Type": "application/pdf",
"Content-Disposition": "attachment; filename="report.pdf""
});
res.send(pdfBytes);
} catch (error) {
res.status(500).json({ error: "PDF generation failed" });
} finally {
await browser.close();
}
});
app.listen(3000);In production, reuse a controlled browser process where your hosting model permits it, limit input size, authenticate the route, and never send service credentials to the client. Validate or sanitize untrusted HTML and restrict navigation if pages can reference internal network addresses.
Wait for the page your application actually needs
networkidle2 is only a general signal. A single-page app can finish its initial network activity before its data, fonts, or charts appear. Add an application-specific readiness marker:
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await page.goto("https://example.com/report", { waitUntil: "domcontentloaded" });
await page.waitForSelector("#report-ready", { timeout: 30000 });
await page.evaluate(() => document.fonts.ready);
const pdfBytes = await page.pdf({ printBackground: true, format: "A4" });Set printBackground: true when CSS backgrounds or background images are part of the design. Use print CSS (@page, page-break rules, and print-only selectors) to control pagination. Confirm that external images and fonts are reachable from the server, not merely from your laptop.
4. Hosted HTML-to-PDF services
A managed service can accept a URL, raw HTML, or an archive and return a PDF without you operating a browser. Adobe PDF Services documents static and dynamic HTML, ZIP, and URL inputs through REST and SDKs for Node.js, .NET, Java, and Python; consult its current documentation for authentication, limits, pricing, and data handling: Adobe HTML-to-PDF documentation.
Cloudflare Browser Run documents a /pdf quick action that accepts a URL or raw HTML, plus Puppeteer and Playwright routes. Its documented request-body limit is 50 MB and applies specifically to that endpoint. Cloudflare warns that JavaScript-heavy pages and SPAs may be incomplete unless you wait for application content. See the /pdf reference and the Browser Rendering documentation.
Compare a hosted converter by supported input, authentication, data retention, geographic processing, request limits, readiness controls, print options, failure reporting, and current price. Do not assume limits or rendering behavior are interchangeable between vendors.
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5. ScreenshotNeo alternative for URL-to-PDF capture
If your source is a public web URL and you do not want to maintain browser automation, ScreenshotNeo is a website screenshot API and MCP server. It accepts consent banners before capture and removes more than 60 known consent platforms, newsletter popups, and chat widgets; each cleanup step can be disabled. Only clean shots are billed: bot checks or CAPTCHAs, blank pages, timeouts, failed loads, and cache hits cost nothing, and response headers report the page verdict and billing status.
It supports PDF output with paper size, margins, landscape mode, and page ranges, along with full-page capture, lazy-image loading, CSS-selector element capture, custom CSS and JavaScript, waits for selectors, delays or network idle, request blocking, headers, cookies, user agents, authorization, timezone, geolocation, transparent backgrounds, resizing, configurable caching, signed links, asynchronous webhooks, bulk capture of up to 100 URLs per call, a usage API, and an OpenAPI specification. An MCP server exposes take_screenshot, get_page_info, and capture_pdf to Claude, Cursor, and other MCP clients. Parameter names used by other screenshot APIs also work for easier migration.
Use the API documentation at https://screenshotneo.com/docs/ for authentication and PDF parameters. A basic request is:
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpFor a PDF response, add the documented PDF output parameter for your 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,
)
r.raise_for_status()
open("shot.webp", "wb").write(r.content)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}`);
if (!res.ok) throw new Error(`ScreenshotNeo returned ${res.status}`);
const data = Buffer.from(await res.arrayBuffer());ScreenshotNeo’s Free plan includes 1,000 shots per month without a card. Paid plans start at $5 for 3,000 shots; every feature is available on every plan, and yearly billing provides two months free. Create a free ScreenshotNeo account to start.
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6. Troubleshooting downloads and rendering
The browser opens the PDF instead of saving it
- Verify the URL is same-origin or a
blob:URL;downloaddoes not generally force arbitrary cross-origin downloads. - Check the anchor filename, response
Content-Disposition, and browser download preferences. - Test a direct user click rather than a delayed or cross-origin script-triggered click.
The PDF is blank or missing application data
- Wait for a page-specific selector or ready flag after client rendering.
- Ensure API calls, images, stylesheets, and fonts are accessible from the renderer.
- For Cloudflare’s quick-action endpoint, keep the request body at or below its documented 50 MB limit.
Fonts, colors, or backgrounds differ
- Await
document.fonts.readyand verify the font network requests. - Use print CSS and enable
printBackgroundwhere supported. - Specify paper size, margins, orientation, and page ranges explicitly.
The downloaded file cannot be opened
- Inspect the response status and headers before saving.
- Confirm the body begins with actual PDF data, not an HTML error page.
- Do not label HTML as
application/pdf; regenerate it with a real converter.
7. Choosing the right method
| Method | Best fit | Key trade-offs |
|---|---|---|
| Same-origin link | PDF already exists | Simple, but subject to origin rules, headers, and browser settings. |
| Browser library | Browser-only conversion | No server browser; rendering and pagination depend on the client. |
| Puppeteer or similar | Controlled server rendering | Requires browser runtime, readiness logic, and resource management. |
| Hosted API | Managed operations | Compare vendor limits, authentication, privacy, pricing, and supported inputs. |
Frequently Asked Questions
Can I download HTML by naming it .pdf?
No. A PDF filename and MIME type do not convert HTML; generate valid PDF bytes first.
Why is my single-page app PDF empty?
The renderer likely printed before client-side content was ready. Wait for an application-specific selector or readiness signal.
Should PDF generation happen in JavaScript or on the server?
Use client-side conversion for a browser-only feature with acceptable rendering trade-offs; use a server or hosted service when you need controlled rendering, secrets, or consistent output.
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1Scan for outdated or missing drivers - takes under a minute2Clear out junk files and repair common Windows errors3Fix the driver behind crashes, sound loss and screen glitchesWhat does the 50 MB limit mean?
It is Cloudflare Browser Run’s documented request-body limit for its /pdf endpoint, not a universal HTML-to-PDF limit.
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