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Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteAn empty Chrome headless PDF usually means Chrome printed before a client-rendered page finished, or the page’s print stylesheet hid what you saw on screen. First verify the serialized DOM, then add a bounded capture delay or (with Puppeteer) wait for an application-specific ready state. If the DOM and screenshot contain content but the PDF does not, inspect print CSS, fonts, backgrounds and the Chromium build.
The commands and code below cover Chrome’s command-line interface and Puppeteer, including diagnostics for intermittent failures.
Start by identifying which layer is empty
Run a DOM diagnostic before changing PDF options:
chrome --headless --dump-dom https://example.test/reportSave the output and compare it with a headless screenshot and the PDF. This separates application rendering failures from print rendering failures.
| What you observe | Most likely cause | Next action |
|---|---|---|
| Dumped DOM and screenshot are empty | Wrong URL, authentication failure, JavaScript error, failed data request or capture before rendering | Check the URL and requests, then add an explicit readiness wait |
| DOM and screenshot contain the report, PDF is empty | @media print rules, print colors, dimensions or a browser regression |
Inspect print CSS and test another current Chromium build |
| Text appears but styling is missing | Fonts or stylesheets were not ready; backgrounds are disabled | Wait for fonts, verify stylesheet requests and enable print backgrounds |
| Success varies between runs | Fixed sleep is racing asynchronous rendering | Use a semantic ready marker plus network-idle and font waits |
A PDF viewer cannot restore content that was never painted. Keep the three artifacts—DOM, screenshot and PDF—for the same URL and browser build while diagnosing.
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Fixing Chrome’s command-line print-to-PDF
1. Confirm the URL and output path
Use a fully qualified URL, verify that the page does not require an interactive login, and make sure the destination directory is writable. A failed navigation can otherwise look like a PDF problem.
2. Add a bounded capture delay
Chrome captures at page-load completion unless you provide a timeout or virtual-time budget. The --timeout value is a maximum wait in milliseconds before content is captured, even if the page is still loading. Start with a value appropriate to the application, such as 5,000 milliseconds:
chrome --headless --disable-gpu
--print-to-pdf=output.pdf
--no-pdf-header-footer
--timeout=5000
https://example.test/reportIncrease the value only when observation shows that the application needs longer. A timeout is not a readiness test: it does not know whether the final data, components or images have appeared.
3. Fast-forward timer-driven pages
Pages that rely on setTimeout or setInterval can benefit from virtual time:
chrome --headless --disable-gpu
--print-to-pdf=output.pdf
--no-pdf-header-footer
--virtual-time-budget=5000
https://example.test/reportVirtual time fast-forwards timer-dependent code; it is different from waiting for real network activity. Use it for deterministic timer-driven rendering, not as a substitute for authentication or a missing API response.
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4. Use the current header/footer switch
Use --no-pdf-header-footer when you do not want Chrome’s printed header and footer. Older Chrome versions used --print-to-pdf-no-header; scripts that still use the older spelling should be checked against the installed build.
5. Compare all three outputs
Generate a screenshot and dump the DOM with the same URL and timing options. If both are empty, investigate application readiness, JavaScript errors and failed requests. If they are populated while the PDF is blank, move to print-CSS checks instead of adding longer sleeps.
Make Puppeteer wait for the application, not just the network
Puppeteer’s PDF guide commonly navigates with waitUntil: 'networkidle2' and then calls page.pdf(). Network idle can occur before a framework finishes processing fetched data, so add a selector that represents the completed report whenever possible.
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(async () => {
const url = 'https://example.test/report';
const browser = await puppeteer.launch({headless: true});
const page = await browser.newPage();
page.on('console', message => {
console.log(`[console:${message.type()}] ${message.text()}`);
});
page.on('requestfailed', request => {
console.error('request failed:', request.url(), request.failure());
});
try {
await page.goto(url, {
waitUntil: 'networkidle2',
timeout: 60000
});
await page.waitForSelector('#report-ready', {
visible: true,
timeout: 30000
});
await page.waitForNetworkIdle({idleTime: 500, timeout: 30000});
await page.pdf({
path: 'report.pdf',
printBackground: true,
preferCSSPageSize: true,
waitForFonts: true
});
} finally {
await browser.close();
}
})();Replace #report-ready with a selector your application sets only after the final render. For example, application code can add data-pdf-ready="true" to a container after its last data and component update. This is more reliable than choosing a delay that happens to work on one run.
page.waitForSelector() can require visibility and throws when its timeout expires. page.waitForNetworkIdle() waits for the configured idle period, but it still cannot infer that your application has consumed the response. The example also logs browser-console messages and failed requests so a blank capture leaves evidence.
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Correct print CSS and PDF options
Puppeteer generates PDFs using the print CSS media type by default. A page can therefore look correct in a normal browser window while its print representation hides the report.
Inspect rules that remove or recolor content
- Search
@media printfordisplay: noneorvisibility: hiddenon report containers. - Check for zero heights, clipping and off-screen positioning.
- Look for white text or low-contrast colors on white paper.
- Verify that a print-only container is actually populated before capture.
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await page.emulateMediaType('screen');
await page.pdf({path: 'report.pdf', printBackground: true});Use printBackground: true when the report depends on CSS background fills or images; the default is false. Use preferCSSPageSize: true when your stylesheet defines the paper size with an @page rule. Keep waitForFonts: true so PDF generation waits for document.fonts.ready; current Puppeteer PDF options list it as true by default, but setting it explicitly documents your intent and protects scripts that move between versions.
Check browser-version regressions
Record the exact Chrome or Chromium version whenever a failure occurs. Chromium issue 362301064 was filed on 2024-08-27 after a report that print-to-PDF stopped working with the default headless mode; the report said --headless=old worked around it, and the issue is marked fixed. Treat that workaround as historical, not a permanent recipe. Reproduce with a current stable build and, if possible, a known-good build before rewriting page code.
Choosing CLI or Puppeteer
| Requirement | Chrome CLI | Puppeteer |
|---|---|---|
| Readiness control | Bounded --timeout or virtual-time budget |
Semantic selectors, network-idle waits and application logic |
| Print styling | Controlled by page CSS and command switches | Can emulate screen media and set PDF options directly |
| Fonts and backgrounds | Must be ready when capture starts | waitForFonts and printBackground are explicit options |
| Observability | Compare DOM, screenshot and PDF externally | Capture console and request-failure events in the script |
| Version sensitivity | Depends directly on the installed Chrome build | Depends on both Puppeteer and its Chromium build |
Use the CLI for simple, stable pages and automation where a bounded delay is acceptable. Use Puppeteer when readiness depends on application state, authentication setup, media emulation or diagnostics.
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Troubleshooting common failures
The DOM is empty
Check redirects, credentials, JavaScript errors and API responses first. Confirm that the URL is the same one a normal browser can load without an interaction that headless Chrome cannot perform. Add logging in Puppeteer and inspect failed requests before changing PDF flags.
The selector wait times out
The selector may be wrong, never become visible, or be rendered only after an API call that failed. Inspect the page’s final HTML and network failures. If the application has no reliable marker, add one at the point where the final render completes rather than increasing the timeout indefinitely.
Screenshot works but PDF is blank
Review @media print, hidden containers, zero dimensions and print colors. Try page.emulateMediaType('screen') as a diagnostic, then decide whether the print stylesheet should be corrected or screen media is genuinely required.
Text exists but images or colors do not
Wait for fonts, confirm stylesheet requests succeeded, and set printBackground: true. For lazy-loaded images, ensure the page has actually scrolled or otherwise triggered the loading behavior before the ready marker is set.
Only some runs are blank
Replace a single fixed sleep with a visible ready selector, a short network-idle wait and font readiness. Keep console and request-failure logs so intermittent data or script failures can be correlated with the capture.
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A previously working command broke after an upgrade
Save the browser version, test a current stable release and compare with a known-good build. Do not assume an old headless-mode workaround applies to current Chrome.
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