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Why a JavaScript website can render as a blank PDF
wkhtmltopdf converts HTML to PDF using Qt WebKit. JavaScript is enabled by default in its documented command-line options, but a website can depend on scripts, browser features, or runtime behavior that the installed WebKit build cannot handle. It can also depend on resources that the machine running the command cannot reach.
A blank PDF alone does not identify which condition occurred. It is a symptom, not a diagnosis. The project describes the tool as a headless renderer using Qt WebKit: wkhtmltopdf project homepage.
Diagnose the failure in order
1. Record the exact environment and command
Capture the output of wkhtmltopdf --version, your operating system and version, the full command, and a small reproducible HTML/JavaScript example if possible. These details help distinguish a site issue from a version- or environment-specific problem; the project asks for version, OS, and a detailed test case when reporting issues: wkhtmltopdf issue tracker.
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2. Check JavaScript settings and stderr
JavaScript is on by default, so check whether your command or wrapper explicitly disables it. Add --debug-javascript and inspect stderr for script errors. The command-line manual documents this option alongside --javascript-delay, --run-script, and --window-status: wkhtmltopdf command-line usage.
3. Confirm the page and its dependencies load on the rendering machine
Verify that the expected content exists in the page’s HTML or DOM, and that the rendering machine can access the page’s scripts, stylesheets, fonts, images, API endpoints, cookies, and redirects. A page that works in your desktop browser may behave differently when rendered in a server or container with different network access, credentials, or browser capabilities.
4. Wait for meaningful readiness—not just an arbitrary interval
The manual says --javascript-delay waits for milliseconds for JavaScript to finish and documents a default of 200 milliseconds. This is a time-based wait, not a signal that an application has completed its own rendering. The library setting describes waiting after page load until printing, or until JavaScript calls window.print(): wkhtmltopdf library page settings.
If content appears after a known delay, try a modestly longer value, for example:
wkhtmltopdf --javascript-delay 1500 https://example.com output.pdf
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Replace https://example.com with your page and adjust the delay only after observing when its content becomes available. When you control the page, a stronger approach is to set window.status to a known value after the content is ready, then wait for it:
wkhtmltopdf --window-status ready https://example.com output.pdf
The page must actually set window.status = 'ready' at the right point for this to help. Neither option guarantees that the page will render successfully.
5. Check compatibility before changing error handling
If waiting does not help, investigate JavaScript compatibility and runtime errors. Do not treat --load-error-handling ignore as a rendering fix: it changes how load failures are handled, but cannot make missing content or unsupported browser features work.
A historical issue documents a report where increasing the delay still resulted in a white page. That example shows why a longer wait is not a universal remedy; it does not establish the cause of another site’s blank output: wkhtmltopdf issue #2051.
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When to keep wkhtmltopdf—and when to change renderers
Keep troubleshooting wkhtmltopdf when the page appears compatible with its engine and the evidence points to content that loads late or to an accessible resource problem. Move to a modern browser renderer when the page relies on browser APIs the installed Qt WebKit build does not support, or when the same reproducible page remains blank after you have confirmed its resources and readiness.
The project’s status account discusses its dependence on WebKit1 and the historical state of that engine. This is useful context for compatibility decisions, not a formal current end-of-life notice: wkhtmltopdf project status.
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Use Playwright when you need a browser-specific readiness check
Playwright can generate PDFs with page.pdf() and wait for a selector or other page-specific condition before capture. Its documentation discourages using networkidle as a general readiness signal; prefer checking for the actual content your application needs to render. PDF generation uses print CSS by default, so test styles, headers and footers, fonts, and page breaks against the intended output: Playwright PDF API and Playwright page waiting API.
For example, this Python outline waits for a page-specific selector before saving the PDF:
from playwright.sync_api import sync_playwright
with sync_playwright() as p:
browser = p.chromium.launch()
page = browser.new_page()
page.goto("https://example.com")
page.locator("main article").wait_for()
page.pdf(path="output.pdf")
browser.close()
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Replace the example URL and selector with the page and element that indicate your application is ready. This is a migration option, not evidence that every blank wkhtmltopdf page requires Chromium.
Common errors and practical fixes
| Symptom | What to check | Next step |
|---|---|---|
| Blank output with JavaScript errors in stderr | Whether the command disables scripts, and which scripts fail under the installed Qt WebKit build | Correct script or environment errors; if required browser features are unsupported, try a modern browser renderer. |
| Content appears only after the PDF is captured | When the page’s meaningful content becomes available | Test a modestly longer --javascript-delay, or use --window-status with a readiness value your page sets. |
| Images, fonts, styles, or data are missing | Whether the rendering machine can reach each resource and API, and whether authentication, cookies, or redirects are required | Make dependencies accessible to the renderer and verify that the page has loaded them before capture. |
| Longer delays do not change the blank result | Compatibility errors, failed resources, and whether the expected DOM content ever appears | Stop increasing the wait blindly; isolate the failure and consider a modern browser renderer if the page requires unsupported features. |
| Ignoring load errors still yields an empty PDF | Whether the underlying page or a required resource failed to load | Fix the failure rather than suppressing its handling; ignoring it does not supply missing content. |
Or skip the browser setup
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Frequently Asked Questions
Does wkhtmltopdf run JavaScript by default?
Yes. JavaScript is enabled by default in the documented command-line options, unless your invocation or wrapper disables it.
Does a blank PDF prove that wkhtmltopdf is discontinued?
No. A blank result does not establish that, and the project status account is historical context rather than a formal current end-of-life notice.
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