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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallSet a sentinel such as window.status = 'ready' only after jQuery’s ready callback and all later rendering work have finished, then run wkhtmltopdf with --window-status ready. This event-driven approach is more reliable than guessing a fixed delay, but jQuery’s ready event alone does not wait for images or asynchronous work such as AJAX requests.
Make wkhtmltopdf wait for a completion signal
wkhtmltopdf can wait until a page sets window.status to a value you choose. Put that assignment at the point where the page is genuinely ready to print—not merely at the start of a callback—and pass the same value to --window-status.
Minimal jQuery example
<script>
$(function () {
// Finish DOM updates, charts, AJAX-driven rendering, and other page work here.
window.status = 'ready';
});
</script>Save the page or add the script to the page that wkhtmltopdf loads, then run:
wkhtmltopdf --window-status ready https://example.com/report.html report.pdfThe option’s value must match the assigned status exactly, including capitalization. You may choose a different sentinel—for example, pdf-ready—as long as both sides use the same string. The command-line option tells wkhtmltopdf to wait until the browser page’s status equals that value before printing.
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Put the signal at the real end of rendering
The minimal snippet works only if everything the PDF needs has already been rendered when the ready callback runs. If the page starts asynchronous work there, signal completion from the final completion path instead. Otherwise wkhtmltopdf may see the sentinel while the chart, table, or other content is still missing.
<script>
$(function () {
$.ajax({ url: '/report-data' })
.done(function (data) {
renderReport(data);
window.status = 'ready';
})
.fail(function () {
// Choose an explicit failure policy for your application.
window.status = 'report-error';
});
});
</script>This example signals success only after the response has been rendered. Decide what your own application should do on failure: it can show an error page, set a separate error sentinel, or leave the success sentinel unset so a caller-side timeout can detect that the expected state was never reached. Do not label a failed or incomplete report as ready.
Or skip the browser setup
If your goal is to capture a page as an image or PDF rather than to run wkhtmltopdf specifically, ScreenshotNeo offers a website screenshot API and MCP server. It is a different workflow, not a wkhtmltopdf flag: make one GET request with the URL, and it can return a PNG, JPEG, WebP, or PDF. Cookie banners, newsletter popups, and chat widgets are removed before the shot; bot checks, blank pages, timeouts, failed loads, and cache hits are not billed. An MCP server lets AI agents use its screenshot tools. The free plan includes 1,000 shots a month with no card; paid plans start at $5 for 3,000 shots.
For example, use cURL to request a WebP capture of the report page:
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When a fixed JavaScript delay is appropriate
If you cannot change the page to set a status signal, or its rendering time has a dependable upper bound, use --javascript-delay to wait a fixed number of milliseconds after page loading:
wkhtmltopdf --javascript-delay 2000 https://example.com/report.html report.pdfThe wkhtmltopdf documentation describes --javascript-delay <msec> as a fixed wait for JavaScript, with a documented default of 200 ms. Its library settings describe load.jsdelay as the time to wait after page loading before printing, or until JavaScript calls window.print(). A 2,000 ms delay is an example, not a universal recommendation: choose a value based on the page and conditions you actually need to support.
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A delay is a timing estimate, not evidence that work has completed. If a request or chart sometimes takes longer than the chosen interval, the output can still be incomplete. A long delay also makes every capture wait, including captures where the page finishes quickly. When you control the page, an explicit completion signal tied to the final rendering step is generally the clearer contract.
| Approach | What determines when printing begins | Best fit | Main limitation |
|---|---|---|---|
--window-status ready |
The page sets window.status to the specified sentinel. |
Pages you can change, with a meaningful completion event. | The signal must be reachable and set at the correct point; reported build and option-order issues mean the exact command should be tested. |
--javascript-delay 2000 |
A fixed number of milliseconds after page loading; 200 ms is the documented default. | Pages you cannot instrument, where a wait is an acceptable estimate. | It can wait too long or print too early when rendering time varies. |
Understand what jQuery ready does—and does not—mean
jQuery’s document-ready callback runs when the DOM hierarchy has been constructed. It does not mean that every image has loaded, and it does not wait for application work that continues after the callback begins. The browser’s window load event waits for assets such as images, but even that is not a substitute for waiting on later work your application starts separately.
Images and other page assets
If the PDF needs images that are still loading after DOM readiness, do not set the status sentinel immediately inside $(function () { ... }). Arrange for the signal to be set after the required assets have completed. Be specific about which assets matter: waiting for every optional third-party resource can make printing fragile, while signaling before a required report image is ready can leave a blank area.
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AJAX, charts, and deferred rendering
For data-driven pages, set the status after the final response has been handled and the resulting DOM updates or chart draw have finished. If rendering itself is asynchronous, the end of the AJAX callback may still be too early; use the chart or rendering library’s completion callback when it provides one. The important condition is that the final content is visible to the page before the sentinel changes.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Troubleshoot an early, missing, or stuck PDF
--window-status has documented issue reports involving signals that appeared to be ignored, a command that did not return when the option was combined with --javascript-delay, and behavior affected by argument ordering around toc. These reports do not establish that every build has the same fault. They do mean that you should verify the exact binary and invocation used in your environment rather than assume that a working command on one machine proves another build behaves identically.
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Check the executable and reduce the test case
- Run
wkhtmltopdf --versionand record the result. The project downloads page identifies the 0.12.6 series as stable and gives its release date as June 11, 2020; confirm the version installed in your own environment rather than inferring it from the download page. - Create a minimal HTML file that sets
window.status = 'ready'from a short timer, then run wkhtmltopdf against that local file with--window-status ready. This separates basic option behavior from jQuery, remote scripts, and application code. - If the minimal page succeeds, add the real jQuery include and ready handler, then add asynchronous rendering one step at a time. This helps identify whether the issue is the option, script loading, or an application completion path.
- Use
--debug-javascriptwhile diagnosing JavaScript errors. Check that jQuery loads successfully before the handler runs and that the assignment is reachable. - Temporarily remove other options, especially
tocand a simultaneous--javascript-delay, then restore them individually. Keep the final argument order that you have tested with your exact binary.
Match the symptom to a likely cause
- The PDF is missing late content: the sentinel is probably set before an AJAX response, chart draw, asset load, or other render step finishes. Move it to the final completion path.
- wkhtmltopdf waits indefinitely: the page may never set the expected string because of a script error, an unavailable script, or an error path that skips the success assignment. Check the spelling on both sides and inspect JavaScript diagnostics.
- The option seems ignored: reproduce with the timer-based minimal file, then compare its result with the production command. Record the version and test without other options before changing the page’s timing logic.
- The behavior changes when options are combined: test the invocation without
--javascript-delayand withouttoc, then add options back one at a time. Treat the exact binary and command line as part of the issue. - The page works locally but not in deployment: provide the project’s support channels with the wkhtmltopdf version, operating system and version, and a minimal HTML/CSS/JavaScript reproduction. A small reproducible case is more useful than a full application whose dependencies obscure the cause.
Account for version, compatibility, and security
The wkhtmltopdf project’s downloads page lists the 0.12.6 series as stable, released June 11, 2020. Its status page says wkhtmltopdf depends on the WebKit1 in-process API and recommends evaluating Puppeteer for sites using dynamic JavaScript, or WeasyPrint and the commercial Prince engine for controlled report generation. For a new system with substantial modern JavaScript, assess whether wkhtmltopdf’s rendering engine is suitable before trying to compensate for compatibility problems with longer waits. For controlled, mostly static reports, compare WeasyPrint or Prince against your layout requirements.
Waiting for a jQuery callback does not upgrade the browser engine or guarantee that a modern site’s scripts will work. If JavaScript compatibility is the underlying problem, changing from a status signal to a longer delay will not fix it. Test the actual pages, assets, fonts, and output layout your workflow depends on.
Security is a separate concern from readiness. The project warns against using wkhtmltopdf with untrusted HTML and JavaScript without sanitization because that can enable complete server takeover. Treat the HTML source, local-file access, network access, and process isolation as deployment boundaries. Do not expose a renderer with broad server permissions to arbitrary user-controlled page content.
Quick Recap
Choose the wait strategy for the job
- Use
--window-statuswhen you control the page and can set the sentinel after the last required render step. - Use
--javascript-delaywhen instrumentation is not possible and a fixed wait is an acceptable trade-off, while recognizing that it cannot prove completion. - Test the precise executable, operating system, and full option combination you will deploy; keep a minimal reproduction alongside production diagnostics.
- Evaluate a different renderer if the requirement depends on JavaScript behavior that wkhtmltopdf’s WebKit1-based engine does not handle reliably.
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