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How to Capture a Full-Page Scrolling Screenshot with Selenium in C#

Use FirefoxDriver.GetFullPageScreenshot() for a full-page Selenium screenshot in C#. Learn why ordinary screenshots differ, what to consider in Chrome, and when scrolling and stitching may help.
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For a full-page screenshot with Selenium in C#, use FirefoxDriver’s GetFullPageScreenshot() method. Selenium’s ordinary screenshot call captures the current browsing context, not a guaranteed full scrollable page. Chrome needs a browser-specific approach; the Firefox method is not available on a general IWebDriver or ChromeDriver.

Capture the full page in Firefox

Selenium’s .NET Firefox driver exposes GetFullPageScreenshot(), which returns a Selenium Screenshot. Save it as a PNG with SaveAsFile:

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using OpenQA.Selenium.Firefox;

var driver = new FirefoxDriver();
try
{
    driver.Navigate().GoToUrl("https://example.com");
    var screenshot = driver.GetFullPageScreenshot();
    screenshot.SaveAsFile("full-page.png");
}
finally
{
    driver.Quit();
}

Use the Firefox driver specifically: the method belongs to FirefoxDriver, not the generic IWebDriver interface. This code assumes Selenium .NET and a compatible Firefox/driver setup; check the API in your installed Selenium package if the method is unavailable. Selenium’s Screenshot.SaveAsFile(string) saves PNG and overwrites a file already at that path, so choose a unique filename if you need to retain earlier captures. Selenium FirefoxDriver source · Selenium .NET Screenshot API

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What changes in Chrome?

Selenium’s standard C# screenshot example casts a driver to ITakesScreenshot, calls GetScreenshot() and saves the result. That is the ordinary screenshot endpoint for the current browsing context; it should not be presented as a guaranteed full-document capture. See Selenium’s screenshot documentation.

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A Chrome-specific option appears in Selenium .NET’s generated DevTools V149 API: CaptureScreenshotCommandSettings.CaptureBeyondViewport. Its documented default is false. This is version-specific API evidence, not a universal cross-version recipe. Match the DevTools namespace to your installed Selenium package and confirm it works with your Chrome version before adopting it. The cited API does not establish a complete initialization snippet for every Selenium/Chrome combination. DevTools V149 API reference

Choose based on how the page loads

  • Firefox and a full-page capture without simulated scrolling: start with FirefoxDriver.GetFullPageScreenshot().
  • Chrome: investigate the DevTools API version matching your installed Selenium package and browser; do not assume the ordinary WebDriver screenshot is full-page.
  • Content appears only after scrolling: consider a scroll-and-stitch strategy that scrolls through the page and joins viewport captures. WebdriverIO documents this user-based approach for lazy-loaded content and complex layouts, but that documentation is not a Selenium C# API guarantee. Test against the target page. Fixed and sticky elements can repeat or otherwise make stitched results unattractive. WebdriverIO screenshot documentation

“Full-page” generally means capturing the full scrollable page, rather than only the visible viewport. Playwright .NET documents that goal with its separate FullPage = true option; this clarifies the outcome but is not a Selenium API. Playwright .NET screenshot documentation

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Troubleshooting

  • GetFullPageScreenshot() is missing: confirm the variable is a FirefoxDriver, not only IWebDriver or a Chrome driver, and inspect the API in the Selenium .NET package you installed.
  • The output contains only the visible area: check that you are not using the standard ITakesScreenshot.GetScreenshot() call when you require a full-page result. For Chrome, verify the exact versioned DevTools API and its beyond-viewport setting.
  • Lazy-loaded content is absent: a full-page capture that does not cause the page to scroll may not trigger content that loads on scroll. Use a tested scroll-and-stitch strategy if that behavior is required.
  • Sticky headers or controls appear repeatedly: this can happen with stitched viewport images. Inspect the page’s layout and test a browser-native full-page route where available.
  • An earlier capture disappeared: SaveAsFile overwrites an existing file at the destination. Generate a distinct path for each capture you want to keep.
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