Outdated Drivers Are Slowing You Down
One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchWindows Errors? Fix Them Before They Spread
Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallWhen Ruby HTML-to-PDF conversion fails, first identify which stage failed: the top-level page navigation, an individual asset request, JavaScript content readiness, or the PDF conversion itself. Then apply the remedy for the renderer your Ruby gem actually invokes. PDFKit and Wicked PDF use wkhtmltopdf; Grover uses Puppeteer and Chromium, so their settings and failure modes are not interchangeable.
Identify the renderer and the kind of failure
A Ruby exception alone does not tell you whether the renderer could not load the page, missed a stylesheet or image, ran out of time waiting for JavaScript, or failed while writing the PDF. Start by recording the wrapper gem, the renderer or browser version, the operating system or container image, and the exact options passed to the renderer.
- Page navigation failure: the renderer cannot load the main HTML URL or file.
- Asset failure: the page opens, but one or more CSS files, images, fonts, or scripts cannot be reached.
- Readiness failure: the page loads, but asynchronous JavaScript has not populated the content before capture.
- Conversion or timeout failure: the page may be ready, but launching the renderer, waiting for requests, or producing the PDF exceeds a limit.
- Self-request deadlock: a renderer launched during a request calls back into the same single-thread server for assets, while that server is occupied waiting for the renderer.
For PDFKit and Wicked PDF, check the wkhtmltopdf binary and its version as well as the gem version. The wkhtmltopdf options below refer to the project’s documentation for version 0.12.6 with patched Qt; other builds may differ. Grover’s settings apply to its Puppeteer/Chromium integration, not to wkhtmltopdf.
Use wkhtmltopdf error handling deliberately
The wkhtmltopdf command-line documentation distinguishes page-load errors from media-load errors. Its documented page-load default is abort; its media-load default is ignore. Each option documents the choices abort, ignore, and skip. These choices control what the renderer does after a failure; they do not repair a bad URL or missing resource.
#1 Best Overall
| Option | Applies to | Documented default | Choices |
|---|---|---|---|
--load-error-handling |
Main page load | abort |
abort, ignore, skip |
--load-media-error-handling |
Media/resource loads | ignore |
abort, ignore, skip |
Use the options only after identifying the failing URL and deciding whether a partial PDF is acceptable. ignore or skip can let a conversion continue while leaving missing content in the output. A missing logo might be tolerable for a draft; a missing chart, legal text, or product image may make the document unusable. Preserve the renderer’s error output and inspect the resulting PDF rather than treating a successful process exit as proof of completeness.
For a diagnostic run, invoke the same wkhtmltopdf binary with verbose output and the same HTML, URLs, and relevant flags as the Ruby job. Check whether the main page fails or whether a specific linked resource is failing. The project documents the flags and their behavior in its wkhtmltopdf command-line usage documentation.
Make HTML assets reachable from the renderer
A page that looks correct in an ordinary browser may still produce a PDF with missing styles or images. The renderer runs from the server, worker, or container that performs the conversion; it may not share the browser’s current URL, filesystem paths, credentials, network routes, or asset configuration. Inspect the actual HTML delivered to the renderer and test each referenced resource from that environment.
Replace relative paths with complete paths
PDFKit recommends absolute paths for resources and complete file paths or domain-qualified URLs when converting raw HTML. A relative reference such as images/logo.png has no reliable meaning unless the renderer has a correct base URL. Give it a full URL or a complete local path, and verify that the chosen host or filesystem location is available to the rendering process.
Free tools Windows power users keep installed
One-click scans. No signup required.
Rank #2
PDFKit also documents root_url for cases where the external hostname cannot be reached from the server. Configure the base address to one the renderer can resolve, and confirm that any authentication or network restrictions needed for the page are handled explicitly. See the PDFKit README for its resource and root URL guidance.
Check Rails and production asset configuration
For Rails PDFs generated with Wicked PDF, use the gem’s PDF asset helpers where appropriate, or provide asset-host/CDN references that are reachable from the renderer. Confirm that assets used by PDF views are precompiled for production. A development server may serve assets differently from a production deployment, so a PDF that works locally can fail after release because a path, host, or compiled asset is missing.
Inspect the rendered HTML source for the final asset URLs, then test those exact URLs from the production worker or container. Check DNS, TLS, proxy rules, firewall access, file permissions, and whether the asset server requires cookies or headers the renderer does not have. The Wicked PDF README describes its Rails asset guidance and development/production differences.
Check for a request loop or single-thread server deadlock
If the PDF action appears to hang only in development, determine whether wkhtmltopdf is requesting images, stylesheets, or scripts from the same application server that is handling the PDF request. In a single-thread server, the original request can occupy the only worker while waiting for the renderer; the renderer then waits for another request to that server to return an asset. PDFKit documents this cycle as a deadlock.
Quick wins for a faster PC:
Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Repair Windows errors before they cause bigger problemsFix Now →Rank #3
PDFKit’s documented workarounds are to use a server with multiple workers or embed the resources so the renderer does not need extra HTTP requests. This is a deployment/concurrency issue, not a reason to suppress load errors. For an asset-heavy PDF, embedding can avoid callbacks but increases the HTML payload; multiple workers allow concurrent requests but consume more server resources. Choose based on the application’s capacity and asset size. The project explains the issue in its PDFKit README.
Wait for JavaScript content using the right engine
wkhtmltopdf: a delay is not a readiness signal
The documented wkhtmltopdf CLI enables JavaScript by default and documents a JavaScript delay with a default of 200 milliseconds. That fixed pause does not establish that asynchronous application content has finished rendering. If required content arrives through JavaScript, identify what event or delay is sufficient in the application and verify that the generated PDF contains it. Increasing the delay can be useful as a diagnostic or a known timing workaround, but it can also add latency without fixing a stalled request.
Disable JavaScript only when the document does not depend on it. For example, a static invoice template may not need scripts, while a chart rendered in the browser does. The wkhtmltopdf usage documentation describes the JavaScript controls and delay in the context of its documented 0.12.6 patched-Qt build: wkhtmltopdf command-line usage.
Grover: separate launch, request, readiness, and PDF timeouts
Grover wraps Puppeteer and Chromium, so investigate browser launch, page/request loading, readiness waits, and PDF conversion as distinct stages. Its README documents separate timeout settings, waits for selectors, functions, or a duration, and options to raise errors for failed requests or uncaught JavaScript errors. When content is dynamic, wait for a meaningful selector or application condition rather than adding an arbitrarily long sleep. Raising request and JavaScript errors during diagnosis helps reveal failures that might otherwise leave incomplete output.
Recommended Free Tools
Rank #4
Use the timeout that corresponds to the stage that actually stalls; increasing every timeout can hide a persistent broken request and make background jobs slower. Review the settings and version notes in the Grover README before applying a configuration, because browser behavior and security defaults are version-specific.
Keep local files and internal networks protected
Do not broadly enable access to local files or internal services just to make a conversion error disappear. wkhtmltopdf documents local-file access as disabled by default unless explicitly allowed. Wicked PDF warns that user-generated HTML, CSS, or JavaScript should be sanitized or restricted, including controls against requests to internal IP addresses or hostnames. Grover’s documentation warns about unsafe file-URI access and describes local-network access as disabled by default for the stated Puppeteer v24.16.0+/Chrome 139+ behavior. Confirm the versions actually deployed before relying on those defaults.
For untrusted or user-controlled HTML, allow only required resource origins and sanitize markup/styles/scripts. Avoid accepting arbitrary file URLs, internal URLs, or user-provided renderer flags. The relevant security notes are in the wkhtmltopdf usage documentation, Wicked PDF README, and Grover README.
Choose troubleshooting steps by symptom
| Symptom | Likely stage | First checks | Next action |
|---|---|---|---|
| Conversion aborts before any PDF is produced | Main page navigation or renderer startup | Exact page URL, executable/browser availability, stderr, network access, credentials | Reproduce with the renderer directly; fix the top-level URL or launch/configuration issue before changing error policy. |
| PDF exists but CSS, fonts, or images are missing | Individual asset loads | Final asset URLs, relative paths, production asset host, permissions, container reachability | Use absolute URLs/paths or correct Rails asset configuration; decide explicitly whether missing assets may be skipped. |
| Text or charts are absent but static content appears | JavaScript readiness | Whether scripts are enabled, browser console/request failures, actual content-ready condition | Wait for the selector/function that indicates content is ready; only use a fixed delay as a measured workaround. |
| Request hangs only when run through the app | Self-request deadlock or slow request | Whether renderer requests assets from the same single-thread server | Use multiple workers or embed resources; separately inspect slow or unreachable requests. |
| Works in development but fails in production | Asset deployment or environment mismatch | Precompiled assets, asset host, DNS/TLS, container filesystem and network | Test the exact generated paths from the production rendering environment. |
| Grover raises a timeout or generic browser error | Launch, content request, readiness, or PDF stage | Which timeout expired; failed requests and uncaught JavaScript errors | Enable diagnostic error raising and adjust only the timeout or wait condition for the failing stage. |
Use a reproducible diagnostic sequence
- Record the runtime: capture the Ruby gem version, renderer/browser version, operating system or container image, exact command/options, and whether the failure occurs locally, in a worker, or in production.
- Save the input: preserve the exact HTML and identify the top-level URL plus every CSS, image, font, and script URL it references.
- Test the page separately from its assets: open the main document from the renderer’s environment, then test failing resources individually. This isolates a navigation error from a media error.
- Check concurrency and timing: for a hang, inspect whether the renderer calls back to the same single-thread server. For dynamic content, identify the readiness condition and determine whether launch, navigation, wait, or PDF conversion timed out.
- Compare deployment settings: verify production asset compilation, absolute paths/URLs, DNS and network access, file permissions, and worker configuration.
- Validate the output: inspect the PDF for omitted content after any error-handling change. Keep a minimal test case that reproduces the failure.
- Escalate with useful evidence: for wkhtmltopdf, include its version, OS/version, and compact HTML/CSS/JavaScript reproduction, as requested by the project’s Reporting Issues guidance.
Or skip the browser setup
If your task is to capture a web page as an image or PDF rather than render a custom Rails view, ScreenshotNeo offers a one-request screenshot API. It is separate from Ruby HTML-to-PDF libraries; use it for URL captures, not as a fix for a broken local renderer. Its consent cleanup accepts cookie banners and removes more than 60 known consent platforms, newsletter popups, and chat widgets before capture, with each step switchable. Bot checks/CAPTCHAs, blank pages, timeouts, failed loads, and cache hits are not billed, and response headers report the page verdict and billing status. Its MCP server provides take_screenshot, get_page_info, and capture_pdf tools for AI agents.
What’s actually slowing this PC down?
Pick the symptom - the matching free tool is one click away.
Example cURL request (replace the URL with the page to capture):
Best Value
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpSee the ScreenshotNeo API documentation for output and request options. One thousand screenshots per month are free with no card; paid plans start at $5 for 3,000. Sign up for ScreenshotNeo’s free plan.
Frequently Asked Questions
Which Ruby HTML-to-PDF gem should I use to avoid page-load errors?
The documentation establishes different troubleshooting controls, not a universally best gem. Choose based on the renderer you can deploy and the resource, JavaScript, timeout, and security controls your PDFs require.
Does setting a longer timeout fix a missing image or stylesheet?
Not necessarily. A missing resource is usually a reachability or path problem; a timeout only helps when a request or readiness condition needs more time and can complete.
The Tool Desk
Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →Outbyte Driver Updater FREEScan for outdated or missing drivers - takes under a minuteDriver Scan →Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
