The Tool Desk
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What “fastest” actually measures
HTML-to-PDF elapsed time is more than the PDF-writing call. A realistic measurement includes process startup, browser startup, DNS and navigation, JavaScript execution, web fonts, images and other network resources, layout, PDF generation, and transferring or saving the output. A tool that wins a warm in-process test can lose when started for every request.
There are no comparable official benchmarks for Puppeteer, Playwright and WeasyPrint under the same page, hardware, versions, startup treatment and readiness rules. Treat the recommendations below as workload matches, not benchmark results.
- Cold start: time to launch the runtime and renderer.
- Warm conversion: time after a browser or Python process is already alive.
- Readiness: whether you wait for JavaScript, fonts, images, network idle or a specific selector.
- Fidelity: whether the output must match Chrome-like behavior, including dynamic content and print CSS.
- Operations: memory, concurrency, deployment complexity and behavior after upgrades.
Choose the renderer that matches the page
JavaScript or browser-level behavior: Puppeteer or Playwright
Use a browser automation library when the page depends on JavaScript, client-side routing, browser APIs, interactive components or exact Chromium-style layout. Both Puppeteer’s Page.pdf() and Playwright’s page.pdf() generate PDF output with print CSS media by default. If your design is written for screen media, emulate screen media before creating the PDF.
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This path has a larger startup and memory cost than a CSS-only renderer, but reusing one browser process can remove repeated launch overhead. Navigation and resource readiness still dominate pages with slow scripts, fonts or third-party assets.
Static, print-oriented HTML in Python: WeasyPrint
WeasyPrint is a visual HTML/CSS rendering engine with a pagination-focused layout system rather than a complete WebKit or Gecko browser. Its version 70.0 documentation supports CLI and Python inputs from a URL, filename, file object or string. It is a strong candidate when the document is mostly static and your application already runs Python.
For batches, keep a Python process alive. WeasyPrint documents this approach to avoid paying startup costs for every document. Check the CSS and HTML features your templates use: browser-only behavior and complex JavaScript are outside its design.
One-off conversion
For a single document, use the renderer already installed and producing acceptable output. Installing and configuring a browser solely to process one small static file can take longer than the conversion itself. Conversely, a dynamic page may require a browser even for one file.
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Puppeteer (Node.js)
Install Puppeteer with npm install puppeteer. This example keeps the browser lifetime explicit, waits for navigation and writes a PDF:
const puppeteer = require('puppeteer');
(async () => {
const browser = await puppeteer.launch({headless: true});
try {
const page = await browser.newPage();
await page.goto('https://example.com', {
waitUntil: 'networkidle0',
timeout: 90000
});
// Print CSS is the default. Use this instead when the site needs screen CSS:
// await page.emulateMediaType('screen');
await page.pdf({
path: 'output.pdf',
format: 'A4',
printBackground: true,
preferCSSPageSize: true
});
} finally {
await browser.close();
}
})();Puppeteer’s guide states that PDF generation waits for fonts by default. You may still need an application-specific readiness check for content loaded after navigation, such as a chart rendered by a later API call.
Playwright (Node.js)
Install it with npm install playwright. Reuse the browser in a worker or service rather than launching it for every request:
const { chromium } = require('playwright');
(async () => {
const browser = await chromium.launch({headless: true});
try {
const page = await browser.newPage();
await page.goto('https://example.com', {
waitUntil: 'networkidle',
timeout: 90000
});
// Playwright uses print CSS by default.
// await page.emulateMedia({media: 'screen'});
await page.pdf({
path: 'output.pdf',
format: 'A4',
printBackground: true,
preferCSSPageSize: true
});
} finally {
await browser.close();
}
})();Use a selector-based wait when “network idle” is not a reliable indication that the document is complete. For example, wait for a report table or a “rendered” marker that your application adds after its data request finishes.
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WeasyPrint implementations
Command line
With WeasyPrint installed, convert a URL or local file directly:
weasyprint https://example.com input.pdfFor a local document, replace the URL with an HTML filename. The CLI is convenient for scripts, but a new process for every item adds startup overhead.
Python API
from weasyprint import HTML
HTML('https://example.com').write_pdf('output.pdf')
# Or render an HTML string:
html = '<html><body><h1>Report</h1></body></html>'
HTML(string=html, base_url='.').write_pdf('report.pdf')For high-volume work, create a service or worker that remains alive and feeds it many documents. Validate fonts, images, page breaks, counters and other print CSS in the exact WeasyPrint version you deploy.
How to benchmark your own fastest option
- Freeze the input: use the same URL or HTML, assets, fonts, paper size, margins and output settings for every tool.
- Define readiness: record whether you wait for network idle, a selector, fonts, a fixed delay or an application-generated completion marker.
- Measure cold and warm runs separately: include process and browser startup in cold timing, then report reused-process timing independently.
- Run enough repetitions: discard an initial warm-up where appropriate and record median and tail times rather than a single lucky run.
- Check the PDFs: compare page count, text, images, fonts, links, page breaks and visual fidelity. A faster incorrect PDF is not a useful result.
- Test production constraints: include container limits, concurrency, network access, font installation, memory pressure and output transfer.
Keep the test script and versions with your deployment notes. Rendering can change between WeasyPrint releases even when its API remains compatible, so inspect representative output after upgrades.
Performance and reliability details that change the result
Reuse versus isolation
A persistent browser or Python worker amortizes startup, but it must be managed. Reset pages or contexts between jobs, enforce navigation and overall job timeouts, and recycle workers if memory grows. Isolated short-lived processes are simpler and can contain failures, at the cost of startup time.
Network-dependent pages
Remote fonts, images, analytics and API calls make results variable. Self-host critical assets where possible, set explicit timeouts, and decide whether a failed optional image should fail the job. Browser tools can execute the JavaScript that assembles the page; WeasyPrint will not substitute for that browser behavior.
Print CSS and page geometry
Both browser APIs default to print media. Set paper format, margins, background printing and CSS page-size handling deliberately. If the site’s stylesheet targets screen media, emulate screen media before PDF generation, then verify pagination because screen layouts often do not map cleanly to paper.
Security
Do not render untrusted HTML in a process that can reach sensitive internal services. Restrict outbound network access, validate URLs, limit document size and execution time, and isolate browser workers when accepting user-supplied content.
Troubleshooting
The PDF is blank or missing late content
The page may finish navigation before its application finishes rendering. Wait for a specific selector or completion marker, confirm the API request succeeded, and capture console and network errors. A fixed delay can help diagnose the issue but is less reliable than a readiness condition.
Fonts or icons are absent
Check that the font files are reachable from the renderer, that the container includes required system fonts, and that the job waits for font loading. Verify the generated PDF on the target platform rather than only on a developer workstation.
CSS looks different
Confirm whether print or screen media is intended. Browser APIs default to print media; use screen emulation when appropriate. In WeasyPrint, replace unsupported browser-specific behavior with pagination-oriented CSS and test the exact release.
Conversion times out
Identify whether the delay is startup, navigation, a third-party resource, JavaScript, layout or output transfer. Block nonessential requests, host required assets locally, set bounded timeouts and capture diagnostics. Do not increase the timeout indefinitely: a stuck page should fail predictably.
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Batch throughput is poor
Stop launching a fresh renderer for every document. Use a long-lived WeasyPrint process or a controlled browser pool, limit concurrency to available CPU and memory, and measure queue time separately from rendering time.
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Bottom line for common workloads
| Workload | Best starting point | Reason |
|---|---|---|
| Dynamic app or browser-specific layout | Puppeteer or Playwright | Executes JavaScript and uses browser PDF behavior. |
| Many static, print-focused Python documents | WeasyPrint in a long-lived process | Avoids repeated startup while using pagination-oriented CSS. |
| One small conversion | Already-installed acceptable tool | Avoids setup time when performance requirements are modest. |
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Frequently Asked Questions
Are Puppeteer and Playwright equally fast?
The available official documentation describes their PDF APIs but does not provide a controlled head-to-head speed result. Benchmark both with the same page, waits, browser version and deployment conditions.
Can WeasyPrint convert any website?
No. It is intended for visual HTML/CSS pagination, not full browser behavior. Pages whose content depends on JavaScript or browser APIs generally require a browser renderer.
Should I wait for network idle before every PDF?
Only when it represents readiness for your page. Some sites keep analytics or streaming connections open; a selector or application completion marker can be more reliable.
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