In Python, use Selenium WebDriver to open the page and call driver.save_screenshot("page.png"). That captures the browser’s current window as a PNG—not automatically the entire page. For reliable documentation, set the intended viewport, wait for the content you need, save to an explicit path, and choose the right capture scope.
Capture a webpage with Selenium in Python
Install Selenium and have a compatible browser and WebDriver available. Selenium 4 includes Selenium Manager to help manage drivers, but browser and driver availability still depend on your environment. This example creates an output directory, saves the screenshot, checks Selenium’s return value, and closes the browser even if navigation or capture fails:
from pathlib import Path
from selenium import webdriver
output = Path("artifacts/page.png").resolve()
output.parent.mkdir(parents=True, exist_ok=True)
driver = webdriver.Chrome()
try:
driver.get("https://example.com")
# Wait for the page-specific content your documentation requires.
saved = driver.save_screenshot(str(output))
if not saved:
raise OSError(f"Could not save screenshot to {output}")
finally:
driver.quit()The Selenium Python API describes save_screenshot as saving the current window to a PNG image. It recommends a full path and a filename ending in .png; its documented return value is False on an I/O error. See the Selenium Python WebDriver API, version 4.50.0.
Choose what the screenshot should contain
Decide whether the documentation needs the visible browser window, a single component, or the full long page. These are different capture scopes, and the available API can depend on the browser and language binding.
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| Documentation need | Selenium route | Important distinction |
|---|---|---|
| Visible window or viewport | driver.save_screenshot("page.png") |
Saves the current window as a PNG. |
| One component | element.screenshot("element.png") |
Locate the element first; the output focuses on that element. |
| Entire long document | driver.save_full_page_screenshot("page.png") |
The documented full-page method is in Selenium’s Firefox Python API; do not assume it is a portable cross-browser default. |
Selenium’s Working with windows and tabs documentation includes an element screenshot example. Full-document capture is documented separately in the Firefox WebDriver API. The Python WebDriver API also documents screenshot bytes and Base64 output if your workflow needs data rather than a PNG file.
Make captures consistent and ready for documentation
Set the viewport before navigation or capture
Viewport dimensions affect responsive layouts and therefore which content appears. Set the browser window to the size your documentation requires before capturing. Selenium’s Python API exposes window sizing and geometry methods; confirm the actual dimensions in your environment if exact output size matters.
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Wait for the page-specific state
A completed navigation does not guarantee that client-rendered text, images, or other asynchronously loaded content is ready. Use an explicit wait for the element or condition your documentation depends on rather than relying on an arbitrary pause. Selenium exposes page-load timeouts, but a timeout limit is not proof that a particular page’s desired content has finished rendering.
Save and verify the artifact
- Create the destination directory before saving and use an explicit path. Resolving the path, as in the example, makes it easier to find the output when a script runs from a different working directory.
- Check the boolean returned by
save_screenshot; treatFalseas a failed save. - Inspect the resulting image for the expected content, dimensions, and capture scope. Selenium documents the capture methods, not a guarantee that a page will render exactly as intended.
Close the browser on every path
Use try/finally and call driver.quit() so the browser is shut down after success or failure. In a test suite, use the framework’s teardown mechanism for the same reason.
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Use Chrome Headless when Selenium is not required
For a simple one-off Chrome capture, Chrome’s command-line interface can save a screenshot without a Selenium script:
chrome --headless --screenshot --window-size=412,892 https://example.comThe documented example writes screenshot.png in the current working directory; --window-size controls the capture dimensions. Chrome also documents a --timeout maximum capture delay for screenshots, DOM dumps, and PDFs. That delay is a control, not a guarantee that a site-specific element is ready. See the Chrome Headless command-line reference. This is a direct Chrome CLI route, not Selenium WebDriver code.
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Troubleshoot common screenshot problems
- No PNG appears: confirm the parent directory exists, the process can write to it, and the path is the one you expect. Check the boolean result from
save_screenshot. - The image shows the wrong layout: set the intended window dimensions before capture; a different viewport can trigger a different responsive layout.
- Text or images are missing: wait for a page-specific condition that represents readiness of the content you need. Navigation completion alone may be too early.
- The screenshot cuts off the lower page:
save_screenshotcaptures the current window. Use a full-page method only where the browser and binding document support it; the cited Selenium full-page API is Firefox-specific. - The element shot is empty or not the intended component: verify the locator identifies the correct element and that it is present and ready before calling its screenshot method.
- The browser process remains after an error: ensure
driver.quit()runs from afinallyblock or test teardown.
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Frequently Asked Questions
Can Selenium save a screenshot as JPEG or WebP with save_screenshot?
The documented Selenium Python method saves a PNG. Convert the resulting image separately if your documentation pipeline needs another format.
Can I capture a screenshot as bytes instead of writing a file?
Yes. Selenium’s Python WebDriver API documents screenshot bytes and Base64 output methods in addition to saving a PNG file.
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