The most reliable way to convert modern HTML to PDF is to render it in a headless Chromium browser, wait for the page, images, and fonts to finish loading, then call the browser’s PDF API. Playwright and Puppeteer preserve JavaScript, web fonts, and browser CSS more faithfully than non-browser converters. For simpler, print-oriented documents, Python’s WeasyPrint or an existing wkhtmltopdf pipeline may be sufficient.
Choose the renderer before writing code
Your source determines the right conversion engine. A real web page with client-side JavaScript, responsive CSS, and web fonts generally needs Chromium. A controlled report template may not.
| Approach | Best fit | Important trade-offs |
|---|---|---|
| Playwright with Chromium | Modern pages, JavaScript applications, web fonts, and browser-faithful CSS | Browser binaries, operating-system libraries, fonts, process lifecycle, and concurrency must be managed. |
| Puppeteer with Chromium | Node.js services already built around the Chrome DevTools ecosystem | Has the same browser-runtime and resource-management requirements; PDF output uses print media by default. |
| WeasyPrint | Python services producing print-oriented HTML and CSS | It is not a browser, so CSS behavior differs. Its documentation warns that untrusted HTML or CSS can create security problems. |
| wkhtmltopdf | Existing command-line or WebKit-based conversion pipelines | It is a separate Qt WebKit executable. Validate modern CSS and JavaScript requirements before adopting it. |
| PDFKit | Documents built programmatically from text, vectors, images, and layout primitives | It constructs PDFs; it does not render arbitrary HTML as a browser does. |
There is no universally fastest library. Measure representative documents in the same runtime, browser version, fonts, and container image that you will use in production.
Node.js: convert HTML with Playwright
Install the package and browser
Create a Node project and install Playwright. The browser executable must be installed separately and kept aligned with the package version.
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npm install playwright
npx playwright install --with-deps chromiumOn a developer workstation, npx playwright install chromium is usually enough. The --with-deps option also installs Linux dependencies when your environment permits it.
A complete conversion function
This function accepts an HTML string, waits for network activity to settle, waits for fonts and images, and returns a PDF buffer suitable for an HTTP response or object storage.
import { chromium } from 'playwright';
export async function htmlToPdf(html) {
const browser = await chromium.launch({ headless: true });
try {
const page = await browser.newPage({
viewport: { width: 1280, height: 900 },
deviceScaleFactor: 1
});
await page.setContent(html, { waitUntil: 'networkidle' });
await page.evaluate(async () => {
await document.fonts.ready;
const images = Array.from(document.images);
await Promise.all(images.map(image => {
if (image.complete) return Promise.resolve();
return new Promise(resolve => {
image.addEventListener('load', resolve, { once: true });
image.addEventListener('error', resolve, { once: true });
});
}));
});
return await page.pdf({
format: 'A4',
printBackground: true,
preferCSSPageSize: true,
margin: {
top: '16mm',
right: '14mm',
bottom: '16mm',
left: '14mm'
}
});
} finally {
await browser.close();
}
}
const pdf = await htmlToPdf('<!doctype html><html><body><h1>Invoice</h1></body></html>');
await import('node:fs/promises').then(fs => fs.writeFile('document.pdf', pdf));For a web endpoint, set Content-Type: application/pdf, set Content-Disposition to inline or attachment, and write the returned buffer to the response. Always close the browser in a finally block, including when navigation or PDF generation fails.
Use an existing page instead of an HTML string
When the document is already hosted, navigate to its absolute URL and wait for the application-specific ready state. A fixed delay can be useful as a last resort, but waiting for a selector is more deterministic.
Do these 3 things before closing this tab:
1Clear out junk files and repair common Windows errors2Fix the driver behind crashes, sound loss and screen glitches3Repair Windows errors before they cause bigger problemsawait page.goto('https://example.com/invoice/123', {
waitUntil: 'domcontentloaded',
timeout: 60000
});
await page.waitForSelector('[data-pdf-ready]', { timeout: 30000 });
await page.evaluate(() => document.fonts.ready);
const pdf = await page.pdf({ format: 'A4', printBackground: true });If the page requires authentication, set cookies or headers on the browser context rather than embedding secrets in visible HTML. Use a dedicated service account with only the permissions needed to render the document.
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Control paper size, colors, and page breaks with print CSS
Chromium PDF generation uses the print CSS media type by default. If your screen layout is the intended output, call page.emulateMediaType('screen') before generating the PDF. Otherwise, define print-specific rules explicitly.
@page {
size: A4;
margin: 16mm 14mm;
}
@media print {
nav, .toolbar, .no-print {
display: none !important;
}
a {
color: inherit;
text-decoration: none;
}
h1, h2, h3 {
break-after: avoid;
}
table, figure, .card {
break-inside: avoid;
}
.chapter {
break-before: page;
}
}- Backgrounds: set
printBackground: truewhen colored panels, gradients, or background images matter. - Sheet size: use
format, or use CSS@pageand keeppreferCSSPageSize: trueso CSS controls the paper. - Custom dimensions: provide
widthandheightinstead of a named format for labels or receipts. - Margins: specify top, right, bottom, and left values; reserve space if you add headers or footers.
- Page ranges: Playwright can emit only selected ranges such as
1-3or2,4. - Scale: use the PDF scale option sparingly. CSS page sizing is usually more predictable.
- Headers and footers: provide header and footer templates when page numbers or dates are required, and test their available height.
- Tagged output: Playwright exposes a tagged-PDF option. Validate the resulting file with an accessibility checker; the option alone does not prove conformance.
Make dynamic content deterministic
networkidle does not guarantee that a single-page application has finished rendering. Prefer an application signal such as [data-pdf-ready], a completed API request, or a known status element. Wait for document.fonts.ready; otherwise fallback fonts can change line wrapping and page count.
Use absolute asset URLs or inline images and stylesheets. A renderer running in a container must be able to resolve every permitted host. If an image is lazy-loaded, scroll it into view or use the page’s full-page capture logic before converting. Disable animations and transitions for repeatable output, for example by injecting a print stylesheet that sets animation: none and transition: none.
For repeatability, pin the Playwright package, browser binaries, operating-system image, and installed fonts. Keep representative HTML fixtures and compare page count, text placement, images, links, and margins after upgrades.
Puppeteer equivalent
Puppeteer follows the same browser pattern: launch, navigate, wait, call page.pdf(), and close. Its PDF guide notes that PDF generation waits for fonts by default.
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import puppeteer from 'puppeteer';
const browser = await puppeteer.launch({ headless: true });
try {
const page = await browser.newPage();
await page.setContent(html, { waitUntil: 'networkidle0' });
await page.evaluate(() => document.fonts.ready);
await page.pdf({
path: 'document.pdf',
format: 'A4',
printBackground: true,
preferCSSPageSize: true,
margin: { top: '16mm', right: '14mm', bottom: '16mm', left: '14mm' }
});
} finally {
await browser.close();
}Call page.emulateMediaType('screen') when screen media, rather than print media, is what your design expects.
Python and command-line alternatives
WeasyPrint
For a Python service with controlled, print-oriented templates, WeasyPrint provides a direct API.
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HTML(string=html, base_url='https://your-app.example/').write_pdf('document.pdf')base_url lets relative images, fonts, and stylesheets resolve. WeasyPrint’s CSS behavior is not identical to Chromium, so test flexbox, grid, JavaScript-dependent content, and advanced web APIs before switching. Never pass arbitrary user HTML or CSS into a privileged process: isolate the worker, restrict outbound requests, and enforce CPU, memory, and time limits.
wkhtmltopdf
An existing pipeline can invoke the Qt WebKit-based executable:
wkhtmltopdf --print-media-type --enable-local-file-access input.html document.pdfOnly enable local-file access when the input directory is trusted. Validate modern CSS and JavaScript behavior on your actual documents; a successful command does not mean the layout matches a Chromium render.
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PDFKit
Use PDFKit when you want to place text, vectors, and images yourself. It streams a PDF but does not parse arbitrary HTML, so adopting it usually means rebuilding layout rules in application code.
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Security boundaries for HTML-to-PDF services
HTML and CSS are executable input. A malicious document can request internal URLs, consume excessive resources, or exploit browser and operating-system capabilities.
- Run conversion in an isolated worker or container without application secrets.
- Apply navigation, CPU, memory, and output-size limits.
- Allow-list outbound hosts and block cloud metadata endpoints and private network ranges.
- Validate image, stylesheet, font, iframe, and redirect URLs before fetching them.
- Do not expose authenticated cookies, bearer tokens, or environment variables to page content.
- Sanitize user data before inserting it into HTML and disable unnecessary browser features.
- Delete temporary files and close every page, context, and browser on success or failure.
Deployment, throughput, and cost considerations
Browser startup is expensive compared with rendering a second document in an already-running process. For sustained traffic, keep a bounded browser pool and create isolated contexts or pages per job. Do not create unlimited tabs: cap concurrency according to available CPU and memory, then queue excess requests.
Set an end-to-end timeout that includes navigation, asset loading, font readiness, and PDF writing. Return a clear error when the deadline expires rather than leaving a worker running. In containers, install browser binaries, shared libraries, and all required fonts in the image; keep package and browser versions aligned.
Cost is driven by your infrastructure, job duration, concurrency, and storage. Benchmark typical short, long, image-heavy, and JavaScript-heavy documents in the target environment. No official documentation establishes a universal speed winner.
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Troubleshooting common failures
| Symptom | Likely cause | Fix |
|---|---|---|
| Browser executable not found | The Playwright or Puppeteer package is installed but its browser binary is not. | Run the matching browser install command during image build and verify the cache path used at runtime. |
| Blank or half-rendered pages | Conversion began before application data, images, or fonts finished loading. | Wait for a ready selector, await document.fonts.ready, and explicitly wait for image completion. |
| Missing backgrounds | Background printing is disabled. | Set printBackground: true and check that print CSS does not remove the background. |
| Unexpected paper size or margins | CSS @page rules conflict with API options. |
Choose one source of truth and use preferCSSPageSize: true when CSS should win. |
| Screen layout differs from PDF | Print media rules are being applied. | Adjust @media print, or call page.emulateMediaType('screen') deliberately. |
| Fonts wrap differently in production | The required font is unavailable, blocked, or not ready. | Install the font in the image, use reachable or embedded assets, and wait for the font set before printing. |
| Navigation timeout | A third-party request, long poll, or unreachable asset prevents the chosen wait condition. | Use an application-ready selector, set a bounded timeout, and block unnecessary requests. |
| Out-of-memory crashes | Too many concurrent pages or oversized images. | Limit pool size, reject unreasonable input, resize images, and recycle unhealthy browser workers. |
| WeasyPrint output lacks interactive content | WeasyPrint does not execute browser JavaScript. | Pre-render the data into HTML or use Chromium for JavaScript-dependent pages. |
Verify every generated PDF
Automated checks should open the file and verify that it is a valid PDF, has the expected page count and paper size, contains required text, and includes links and images. Review representative pages visually for clipping, widows and orphans, broken tables, header overlap, and incorrect colors. If accessibility is a requirement, inspect reading order, headings, language metadata, text alternatives, and tagged structure with a dedicated PDF validator.
Or skip the browser setup
If the HTML is already reachable at a URL, ScreenshotNeo can return a PDF from one GET request without you packaging Chromium. Its capture flow accepts consent banners like a visitor and removes more than 60 known consent platforms, newsletter popups, and chat widgets before capture; each cleanup step can be disabled. Bot checks or CAPTCHAs, blank pages, timeouts, failed loads, and cache hits are not billed, and the response identifies the result with 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://example.com/invoice/123
-o invoice.pdfSee the ScreenshotNeo API documentation for output and option details. The equivalent Node.js and Python calls are:
import requests
r = requests.get(
'https://api.screenshotneo.com/v1/shot',
params={'access_key': 'YOUR_API_KEY', 'url': 'https://example.com/invoice/123'},
timeout=90
)
r.raise_for_status()
open('invoice.pdf', 'wb').write(r.content)const q = new URLSearchParams({
access_key: 'YOUR_API_KEY',
url: 'https://example.com/invoice/123'
});
const res = await fetch(`https://api.screenshotneo.com/v1/shot?${q}`);
if (!res.ok) throw new Error(`ScreenshotNeo request failed: ${res.status}`);
await Bun.write('invoice.pdf', res);ScreenshotNeo also provides an MCP server with take_screenshot, get_page_info, and capture_pdf tools for Claude, Cursor, and other MCP clients. It supports full-page capture, CSS-selector element capture, dark mode, device and viewport settings, retina scale, paper size, margins, landscape mode, page ranges, custom CSS and JavaScript, click and wait actions, request blocking, headers, cookies, user agents, authorization, timezone, geolocation, caching, signed links, asynchronous jobs, webhooks, bulk capture of up to 100 URLs per call, usage reporting, and an OpenAPI specification. Parameter names used by other screenshot APIs also work.
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Frequently Asked Questions
Should I use a URL or an HTML string as the input?
Use an HTML string when your service owns the complete template and assets. Use a URL when an application route already assembles authentication, data, and browser-side rendering; then wait for an explicit ready signal before printing.
How do I keep PDFs stable after browser updates?
Pin the renderer package, browser binary, operating-system image, and fonts, and run fixture-based visual and text checks before upgrading any of them.
Can a PDF contain only selected pages?
Yes. Playwright exposes page-range selection, so a service can emit ranges such as 1-3 or 2,4 after the complete document has rendered.
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