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Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Clear out junk files and repair common Windows errorsFree Scan →Scan for outdated or missing drivers - takes under a minuteDriver Scan →Use --run-script to inject JavaScript after a page loads, then control capture timing with either a fixed --javascript-delay or a page-set window.status value passed through --window-status. JavaScript is enabled by default, but adding --enable-javascript makes your intent explicit. The same pattern works for PDF output and, with an important version caveat, image output.
The basic commands
These commands cover the common cases. Replace the input URL or HTML file and output path with your own values.
wkhtmltopdf --enable-javascript --javascript-delay 1000 input.html output.pdfThe command enables JavaScript and waits 1,000 milliseconds after page loading before producing the PDF.
wkhtmltopdf --enable-javascript --run-script "document.body.dataset.rendered='true';" input.html output.pdf--run-script runs the supplied snippet after the page is done loading. It is repeatable, so you can pass more than one post-load script:
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wkhtmltopdf
--enable-javascript
--run-script "document.querySelector('#status').textContent='ready';"
--run-script "document.body.classList.add('captured');"
input.html output.pdfFor an image, use the corresponding executable:
wkhtmltoimage --enable-javascript --javascript-delay 1000 input.html output.pngHow wkhtmltopdf executes JavaScript
JavaScript is on by default
The documented command-line behavior allows web pages to run JavaScript by default. Use --enable-javascript when you want the command line to state that requirement explicitly. Use --disable-javascript when you need a static render or want to prevent page scripts from running.
Enabling JavaScript does not by itself guarantee that every asynchronous operation will finish before capture. A page can still be waiting for an Ajax request, a chart library, a timer, or a client-side rendering step when the renderer takes its snapshot.
Injecting code after load
--run-script <js> is intended for additional code that should run after the page has finished loading. Typical uses include adding a CSS class, replacing text, triggering a component, or setting a marker that your own page can observe.
Quote the entire shell argument. In POSIX shells, single quotes make JavaScript punctuation easy to preserve:
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wkhtmltopdf --enable-javascript
--run-script 'document.querySelector("#chart").classList.add("print-mode");'
input.html output.pdfIn the Windows command prompt, double quotes surround the argument and JavaScript’s inner quotes must be escaped or changed to single quotes:
wkhtmltopdf --enable-javascript --run-script "document.body.dataset.rendered='true';" input.html output.pdfKeep injected code short and deterministic. If it starts asynchronous work, pair it with an explicit completion strategy rather than assuming the renderer will wait for it.
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Make the renderer wait for asynchronous work
Fixed delay with --javascript-delay
Pass a number of milliseconds when the page needs a known settling period:
wkhtmltopdf --enable-javascript --javascript-delay 1500 https://example.com report.pdfA delay is simple and works well when the page’s work has predictable duration. It is less reliable when network speed or data size varies: too short produces an incomplete document, while too long adds needless latency to every conversion.
Page-signaled completion with --window-status
For variable-duration work, have the page set window.status only after the final DOM update:
<script>
fetch('/data.json')
.then(response => response.json())
.then(data => {
document.querySelector('#result').textContent = data.value;
window.status = 'ready-for-capture';
});
</script>Then wait for that exact value:
wkhtmltopdf --enable-javascript
--window-status ready-for-capture
https://example.com/report.html report.pdfThis approach ties capture to the page’s actual state instead of an arbitrary number of milliseconds. Set the status after images, charts, fonts, and other required DOM changes have completed—not merely when the request has started.
Using window.print()
The libwkhtmltox API reference describes rendering as waiting for the configured JavaScript delay or until JavaScript calls window.print(). Where your packaged binary honors that behavior, a page can call window.print() as its completion signal. Test this with the exact binary you deploy, because wkhtmltopdf and wkhtmltoimage builds can differ in timing behavior.
Choosing a completion method
| Situation | Recommended control | Trade-off |
|---|---|---|
| Static page with a predictable render time | --javascript-delay <milliseconds> |
Easy to configure, but the value may be too short or unnecessarily long. |
| Data arrives at an unpredictable time | Page sets window.status; CLI uses --window-status <value> |
More deterministic, but the page must set the value on every successful path. |
| Code already uses print-oriented completion | window.print() where supported by the binary |
Behavior is renderer/build dependent and should be validated before production use. |
wkhtmltoimage timing and the version caveat
The image command accepts the same JavaScript and delay flags:
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wkhtmltoimage --enable-javascript
--run-script "document.body.dataset.rendered='true';"
--javascript-delay 1000 input.html output.pngHowever, issue #2142 records historical wkhtmltoimage builds that rendered before delayed DOM updates because --javascript-delay and --window-status were ignored. This is a binary-specific caveat, not a guarantee that every current package has the bug.
Check the exact wkhtmltoimage executable, package version, and distribution you deploy. If timing is critical, create a small fixture page that changes visible text only after a delay, then verify that the captured image contains the changed text. If the binary does not honor the timing flags, make the page render synchronously or use a conservative fallback delay after confirming what that build actually does.
Local HTML, scripts, and assets
Pages loaded from local files often reference local JavaScript, CSS, fonts, or images. Review local-file access deliberately rather than assuming a file URL can read any path.
--disable-local-file-accessprevents local file access.--enable-local-file-accessenables it when your conversion requires local resources.
Use the narrowest access arrangement appropriate for your deployment and keep untrusted input away from a process that can read sensitive local files. A page can have JavaScript enabled while still failing because its script or asset is inaccessible as a local file.
Debug JavaScript and long-running scripts
Expose errors first
Add --debug-javascript while diagnosing missing elements, syntax errors, failed promises, and other browser-side warnings:
wkhtmltopdf --enable-javascript --debug-javascript
--javascript-delay 2000 input.html output.pdfRun the same input outside the conversion pipeline when possible and confirm that the script is actually present in the loaded page, not just in a source file that the renderer cannot reach.
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Check slow-script handling
wkhtmltopdf and wkhtmltoimage include controls that can stop scripts considered too slow. If legitimate rendering work is being terminated, test with --no-stop-slow-scripts:
wkhtmltopdf --enable-javascript --no-stop-slow-scripts
--javascript-delay 3000 input.html output.pdfDo not disable the safeguard reflexively. First determine whether the page has an accidental infinite loop or an unexpectedly expensive operation. A long delay does not repair a script that never reaches its completion state.
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If you embed the renderer instead of invoking the CLI, the same concepts are exposed as settings:
| CLI option | libwkhtmltox setting | Purpose |
|---|---|---|
--enable-javascript or --disable-javascript |
web.enableJavascript |
Controls whether page JavaScript executes. |
--javascript-delay <milliseconds> |
load.jsdelay |
Sets the post-load wait before rendering. |
--window-status <value> |
Use the corresponding window-status load setting in your binding | Waits for a page-controlled status value where supported. |
The API reference describes load.jsdelay as waiting that amount or until JavaScript calls window.print(). Binding names and configuration syntax vary, so inspect the API wrapper you use rather than copying CLI syntax into application code.
A repeatable production workflow
- Prove the page state. Add a visible marker or log message immediately before setting
window.status. Confirm that all required data and DOM updates happen first. - Start with explicit flags. Use
--enable-javascript, a completion strategy, and--debug-javascriptduring development. - Test both output types. A PDF conversion succeeding does not prove that the installed image binary honors the same timing controls.
- Test slow and failed paths. Simulate a delayed request, an empty response, and a script error. Decide whether the conversion should fail, capture a fallback state, or continue without optional content.
- Remove diagnostic options after validation. Keep the chosen delay or status protocol, but avoid leaving verbose debugging enabled in routine jobs unless you need its output.
Troubleshooting
The PDF or image contains the initial, unmodified DOM
- Confirm JavaScript was not disabled by a global option or wrapper setting.
- Check that
--run-scriptis quoted correctly and runs after the intended page loads. - If the page is asynchronous, replace a guess with
--window-statusor increase the delay after measuring the real work. - For images, verify whether the exact wkhtmltoimage build honors delay and status; issue #2142 documents builds that did not.
The command waits indefinitely
- Inspect the page code for a branch that never sets the expected status.
- Use
--debug-javascriptto find exceptions that stop the completion code. - Check whether a request is blocked, unreachable, or waiting on a resource that never resolves.
- Review slow-script handling; only use
--no-stop-slow-scriptswhen the long work is intentional and bounded.
A local script or image is missing
- Check whether local-file access has been disabled.
- Enable local access deliberately with
--enable-local-file-accesswhen the input is trusted and requires it. - Verify file paths and permissions from the account that actually runs wkhtmltopdf or wkhtmltoimage.
The script works in a browser but not in wkhtmltopdf
- Use the renderer’s debug output to identify unsupported or failing code.
- Confirm every remote resource is reachable from the conversion host.
- Replace browser-only timing assumptions with a visible, deterministic completion marker.
- Record the renderer binary and package version; behavior is not uniform across builds.
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Use the ScreenshotNeo API documentation for the complete option list. A basic call is:
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FAQ
Can I pass more than one custom script?
Yes. The --run-script option is repeatable. Keep each snippet independently quoted and make their order explicit when one depends on another.
Does a successful JavaScript exit prove the page is ready?
No. A script can finish while a separate request or rendering task is still pending. Signal readiness only after the content that must appear in the output has been updated.
Why record the exact wkhtml binary in deployment?
JavaScript timing behavior, especially for wkhtmltoimage, has varied between packaged builds. Reproducing a conversion requires the same executable and configuration, not just the same command-line text.
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Can I pass more than one custom script?
Yes. The --run-script option is repeatable. Keep each snippet independently quoted and make their order explicit when one depends on another.
Does a successful JavaScript exit prove the page is ready?
No. A script can finish while a separate request or rendering task is still pending. Signal readiness only after the content that must appear in the output has been updated.
Why record the exact wkhtml binary in deployment?
JavaScript timing behavior, especially for wkhtmltoimage, has varied between packaged builds. Reproducing a conversion requires the same executable and configuration, not just the same command-line text.
Quick Recap
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