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Use a normal HTML stylesheet link, then give your Java converter a base URI and permission to fetch the resource. For PDFreactor 12.7.1, a document loaded from a URL gets that URL as its base automatically, and linked stylesheets are fetched automatically. If you supply HTML as a string or another non-URL source, configure the base URL explicitly. iText uses the same concept under the name BASEURI. The exact Java call depends on the renderer, so match the example to the library and version you deploy.
1. Put the remote stylesheet in the HTML
The HTML side is standard:
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<link rel="stylesheet" href="https://static.example.com/css/print.css">
</head>
<body>
<h1>Report</h1>
</body>
</html>An absolute https:// URL identifies the stylesheet directly. A relative reference such as ../css/layout.css is resolved against the document’s base URL. The renderer process, not the user’s browser, must be able to reach the host, complete TLS verification, and read the response.
Keep the link in the document’s <head>. If the stylesheet itself imports other files or fonts, those URLs also need to resolve from an appropriate base and remain reachable.
2. PDFreactor: URL input versus HTML input
Converting a page at a URL
PDFreactor 12.7.1 automatically uses the source document URL as the base when you convert a URL. Therefore a page such as https://example.com/reports/annual.html can resolve ../css/print.css relative to that location. Linked external resources, including <link> stylesheets, are loaded automatically. See the PDFreactor 12.7.1 Web Service manual for the URL-input API for your edition.
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Converting an HTML string or local content
When the input is not itself a URL, set a base URL that represents the directory containing the HTML resources. The PDFreactor library manual documents config.setBaseUrl("https://someServer/public/") for this case. A trailing slash matters because relative URL resolution follows normal URL-directory rules.
// Illustrative PDFreactor configuration; use the input/conversion method
// documented for the PDFreactor 12.7.1 library edition.
PDFreactor pdfReactor = new PDFreactor();
Configuration config = new Configuration();
config.setBaseUrl("https://someServer/public/");
// Supply html, then invoke your edition's convert(...) method.Do not copy a method signature from another renderer: PDFreactor’s web-service and library interfaces differ, and other Java libraries use different configuration objects.
Remote-resource controls
PDFreactor verifies HTTPS certificates and provides connection and read timeout settings. Its documented defaults also restrict protocols, disable filesystem access, and provide controls for network address types. Keep those restrictions narrow when HTML or CSS URLs can be influenced by users; opening filesystem or private-network access can expose resources the converter should never fetch. Details are in the PDFreactor 12.7.1 library manual.
3. iText pdfHTML: set the base URI
iText’s pdfHTML module parses HTML and CSS and maps them to iText objects. When your HTML contains relative CSS, pass the parent location as the base URI (called BASEURI in the iText tutorial). The base should be the directory or URL from which the HTML’s relative resources are published.
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String html = ""
+ "<html><head>"
+ "<link rel='stylesheet' href='../css/print.css'>"
+ "</head><body>Report</body></html>";
// The concrete ConverterProperties and HtmlConverter calls depend on
// the pdfHTML version; the important setting is the base URI.
ConverterProperties properties = new ConverterProperties();
properties.setBaseUri("https://static.example.com/reports/");
HtmlConverter.convertToPdf(html, new FileOutputStream("report.pdf"), properties);Consult iText’s Hello HTML to PDF tutorial for the version-specific setup and API. If the stylesheet is already absolute, a base URI is not needed for that link, but it can still be required for images, imported CSS, or fonts.
4. OpenHTMLtoPDF and other renderers
OpenHTMLtoPDF describes support for well-formed XML/XHTML, some HTML5, and CSS 2.1 plus later standards. It is not a full browser engine. Its project documentation and repository are at github.com/danfickle/openhtmltopdf. Supply a base URL through the builder or user-agent/resource-loader configuration used by the exact version you selected, then verify that remote resources are permitted in your deployment.
Renderer behavior is not interchangeable. iText’s official FAQ says pdfHTML does not evaluate JavaScript; OpenHTMLtoPDF supports a bounded markup and CSS subset; PDFreactor documents more extensive resource and security controls. A page that looks correct in Chrome may still lose layout, generated content, web fonts, or script-driven data during conversion.
5. A reliable implementation checklist
- Make the link explicit. Prefer an absolute HTTPS stylesheet URL while diagnosing. Confirm the response is CSS, not an HTML login page or redirect.
- Choose the base. URL input normally supplies it automatically in PDFreactor. For HTML strings, set PDFreactor’s base URL or iText’s
BASEURI; configure the equivalent in your renderer. - Test reachability from Java. The server running the converter may have different DNS, proxy, firewall, or certificate trust than your desktop browser.
- Set bounded timeouts. Use the renderer’s connection and read timeout settings so a dead stylesheet cannot hold a job indefinitely.
- Check access policy. Allow only required protocols and hosts. Do not broadly enable filesystem or private-network access for untrusted HTML.
- Validate CSS support. Replace unsupported browser-only features with print-oriented CSS that your renderer documents as supported.
- Compare output at the deployed version. Pin the library version and render a representative document containing fonts, images, nested imports, tables, and page breaks.
6. Troubleshooting external CSS
| Symptom | Likely cause | Fix |
|---|---|---|
| Everything is unstyled | The link is missing, unreachable, or returns non-CSS content | Inspect the final HTML, fetch the URL from the converter host, and verify the response and content type. |
| Absolute URL works; relative URL fails | No base URI, or a base points to the wrong directory | Set PDFreactor’s setBaseUrl or iText’s BASEURI; include the correct trailing slash. |
| Timeout or intermittent missing styles | Slow origin, blocked egress, proxy, or restrictive timeout | Check network logs, configure connection/read timeouts, and make the stylesheet reliably reachable. |
| TLS or certificate error | The Java runtime cannot validate the HTTPS chain | Fix the server certificate or the runtime trust configuration; do not disable certificate verification as a shortcut. |
| Local file works but remote URL does not | Protocol, host, filesystem, or network-address restrictions | Review PDFreactor security settings and permit only the required resource location. |
| CSS downloads but features are absent | The renderer does not implement the browser feature or JavaScript is required | Check the exact renderer documentation and simplify the stylesheet or pre-render dynamic content. |
| Fonts or imported CSS are missing | Nested URLs resolve against an unexpected base or are blocked | Use absolute diagnostic URLs, then correct the base and allow the required resource types. |
7. Performance, security, and cost decisions
Reduce avoidable network work
Host CSS close to the conversion service, keep stylesheets small, and avoid chains of unnecessary imports. If you control the application, caching the stylesheet or serving a versioned asset reduces repeated fetch latency. Measure conversion time with cold and warm resource caches; documentation does not establish a universal speed advantage for one renderer.
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Protect the conversion boundary
Remote HTML is an outbound-request capability. Treat URLs and HTML supplied by users as untrusted input. Restrict protocols and destinations, retain certificate validation, disable filesystem access unless required, and prevent access to private network ranges. These controls are particularly important for server-side PDF jobs.
License and feature fit
Compare the exact CSS and HTML features you need, base-URI behavior, JavaScript requirements, deployment model, and licensing. The cited sources do not provide a comprehensive feature benchmark, so a representative document test is more useful than assuming browser equivalence.
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Read the full parameter reference in the ScreenshotNeo documentation. A Java application can call the endpoint with any HTTP client:
var request = HttpRequest.newBuilder()
.uri(URI.create("https://api.screenshotneo.com/v1/shot"
+ "?access_key=YOUR_API_KEY&url=https%3A%2F%2Fstripe.com"))
.GET().build();
var response = HttpClient.newHttpClient().send(request,
HttpResponse.BodyHandlers.ofFile(Path.of("shot.webp")));The same request in cURL:
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpPython:
import requests
r = requests.get("https://api.screenshotneo.com/v1/shot", params={"access_key": "YOUR_API_KEY", "url": "https://stripe.com"}, timeout=90)
open("shot.webp", "wb").write(r.content)Node.js:
const q = new URLSearchParams({ access_key: 'YOUR_API_KEY', url: 'https://stripe.com' });
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9. Final verification before production
- Render with the same Java runtime, library version, and network policy used in production.
- Verify the stylesheet URL, base URI, TLS chain, authentication, and timeout behavior.
- Test a failure case and confirm the job fails clearly rather than silently producing an unstyled PDF.
- Inspect page breaks, print colors, fonts, images, imported CSS, and any content that depends on JavaScript.
Frequently Asked Questions
Can I use a relative CSS URL when converting an HTML string?
Yes, if you configure the renderer’s base URI to the directory that contains the HTML resources. Without a base, the relative link has no reliable parent location.
Does loading CSS from HTTPS make Java PDF output identical to a browser?
No. Network retrieval and rendering are separate concerns; each Java renderer supports a defined subset of HTML, CSS, and JavaScript. Test the exact library version with your document.
Should I inline the stylesheet instead?
Inlining can remove one network dependency, but it does not solve unsupported CSS, dynamic content, or missing fonts and images. A correctly configured base URI is usually cleaner for reusable stylesheets.
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