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Use Selenium to test the browser action, then use an HTTP client or a PDF library to test the document itself. For a download, Selenium can find and click the link and provide the browser session context, but WebDriver does not expose download progress. For a PDF generated from a webpage, Selenium’s print interface can return PDF data for saving and inspection.
Choose the PDF workflow you need to test
Keep three cases separate: a server-provided PDF download, a PDF opened in the browser, and a PDF generated by printing a webpage. They have different failure points and need different assertions.
| Approach | Best for | Useful assertions | Limitation |
|---|---|---|---|
| Selenium click plus an HTTP client | Download links, including authenticated downloads | Link or URL, HTTP result, saved-file presence, extracted document content | Selenium does not expose download progress; let the HTTP client handle the transfer. |
| Selenium print API | PDFs generated from webpages | Print options, returned PDF data, saved file, required text or layout-related requirements | API shape varies by language and interface; text extraction alone does not establish visual fidelity. |
| Browser PDF viewer automation | Viewer launch, form interaction, save behavior, or browser-specific display | Expected viewer state and user-facing controls | Behavior depends on browser and MIME configuration; viewer-specific selectors are not portable WebDriver behavior. |
Choose based on the workflow under test, the assertion you need (transport, text, conformance, or visual rendering), your browser and language binding, and whether authentication is involved. Selenium documents browser-specific capabilities; do not assume a viewer control or download preference works uniformly across browsers. See Selenium’s supported browsers documentation.
Test a downloaded PDF with Selenium and an HTTP client
Selenium’s official guidance cautions that WebDriver can start a download but does not expose its progress. Its recommended pattern is to locate the link and obtain any required cookies through Selenium, then use an HTTP client such as curl to retrieve the file. This separates browser interaction from transfer and file validation.
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- Use Selenium to wait for and locate the download link. Assert that the link points to the expected resource or route.
- If the application requires a signed-in session, obtain the relevant browser cookies or other required authentication state through your chosen binding.
- Pass the resource URL and required session state to an HTTP client. Check the response status and headers, and save the bytes to a controlled test location.
- Check that the saved file is non-empty and can be opened by a PDF-aware library.
- Assert the document properties that matter, such as required text, form fields, or a conformance requirement.
Selenium’s file-download guidance describes this division of work: File downloads. The precise code for extracting cookies and making an authenticated request depends on the language binding and application authentication scheme; preserve the required session state rather than assuming the PDF is public.
Use PDFBox for document-level assertions in Java
Apache PDFBox is a Java library that supports Unicode text extraction, form handling, and PDF/A-1b preflight validation, among other PDF operations. Use text extraction to verify required labels or values. Run PDF/A-1b validation only when that conformance level is an actual product requirement; a successful download or readable text does not prove PDF/A conformance. Project information and releases are listed at Apache PDFBox.
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Test PDFs generated from a webpage with Selenium print APIs
When the behavior under test is printing a page to PDF, use Selenium’s print interface rather than treating a browser-viewer tab as the generated document. Selenium’s PrintOptions cover orientation, margins, scale, background output, and shrink-to-fit. The Java PrintsPage path returns PDF data encoded as base64, which can be decoded and saved for later assertions. Selenium also documents a BiDi printing path through BrowsingContext; check the documentation for the interface and binding used by your test.
- Load the target page and wait for the content that should appear in print output.
- Set the print options relevant to the expected result, including orientation, margins, scaling, background printing, or shrink-to-fit.
- Call the print interface supported by your language binding and browser setup.
- Decode the returned PDF data where needed, save it as a test artifact, and verify that it opens.
- Use a PDF library for text or conformance assertions. If the requirement is visual fidelity, inspect a rendered output or compare it using a separate visual-testing method; text extraction does not check page appearance.
See Selenium’s Print Page documentation for the interface and options. Because the precise API differs across language bindings, use its examples for the binding in your project rather than assuming a Java call maps directly to another language.
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Test browser PDF viewing as a separate behavior
If the requirement is that a PDF opens in a browser viewer, test that user-facing path separately from the response, file bytes, and extracted text. Viewer behavior depends on the browser and configuration. Firefox’s built-in viewer is used when PDFs are set to open in Firefox, which is the default setting documented by Mozilla; an incorrectly set MIME type is a documented exception. See Mozilla’s Firefox PDF viewer guidance.
Do not use Firefox- or Chrome-specific viewer controls as if they were standard WebDriver selectors. Selenium’s browser documentation covers supported browsers and their differing capabilities: Supported Browsers.
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Common failures and how to diagnose them
- The test hangs or cannot tell whether a download finished: WebDriver does not expose download progress. Use Selenium to identify the resource and session, then let an HTTP client retrieve it and report the transfer result.
- The HTTP client receives an error or an HTML login page instead of a PDF: The request may lack the browser’s authentication state, or the server may have returned an error page. Reuse the required cookies or authentication data and inspect the response status and content before treating the bytes as a PDF.
- A PDF download succeeds but the content is wrong: File existence only establishes that bytes were saved. Extract text or inspect relevant fields with a PDF library and assert the expected document content.
- Extracted text passes but the printed page looks wrong: Text extraction does not prove visual fidelity. Check print settings and use a rendered-document comparison if visual layout is part of the requirement.
- The PDF does not open in the expected browser viewer: Check browser configuration and the server’s MIME type, then test the viewer path in the specific browser. Firefox documents an exception for incorrectly set MIME types.
- Print results differ by language or interface: Selenium has language- and interface-specific print APIs, including the Java
PrintsPageroute and a BiDiBrowsingContextroute. Use the documentation for the binding under test.
Or skip the browser setup
If your goal is to capture a webpage as a screenshot or PDF rather than test your application’s Selenium workflow, ScreenshotNeo offers a one-call API:
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 request options. It accepts cookie or consent banners before capture and removes more than 60 known consent platforms, newsletter popups, and chat widgets; each cleanup step can be turned off. Bot checks, blank pages, timeouts, failed loads, and cache hits are not billed, and responses report the page verdict and billing status in headers. An MCP server provides take_screenshot, get_page_info, and capture_pdf tools for AI agents. The free plan includes 1,000 screenshots a month with no card; paid plans start at $5 for 3,000. Sign up for 1,000 free screenshots a month, with no card required.
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Can Selenium verify the text inside a downloaded PDF?
Use Selenium for the browser interaction and a PDF-aware library for document assertions. In Java, PDFBox supports Unicode text extraction.
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Does Selenium’s print API create a PDF from a webpage?
Yes. Selenium documents print interfaces and options; the Java PrintsPage path returns base64-encoded PDF data that can be decoded and saved.
Does a successful PDF download prove the document is valid?
No. Verify the response and saved file, then use a PDF library to check the content or any required conformance.
Quick Recap
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