Use Selenium’s Chrome options to add --headless, open the URL, wait for the content your test needs, and call the binding’s screenshot method. In Python, the standard operation saves the current window (the current browsing context) as a PNG. It does not, by itself, prove that an entire long page was captured.
This guide shows a reliable Python workflow, explains timing and dimensions, covers equivalent implementation choices, and diagnoses the failures that commonly appear in unattended Chrome sessions.
Minimal Python example
Install Selenium in the environment that will run the test:
python -m pip install seleniumThen run this complete script:
from selenium import webdriver
from selenium.webdriver.chrome.options import Options
options = Options()
options.add_argument("--headless")
driver = webdriver.Chrome(options=options)
try:
driver.get("https://example.com")
driver.save_screenshot("screenshot.png")
finally:
driver.quit()save_screenshot(filename) writes a PNG of the current window and returns a Boolean result. Use an absolute path when a CI job or another process must find the file:
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from pathlib import Path
output = Path("artifacts/example.png").resolve()
output.parent.mkdir(parents=True, exist_ok=True)
assert driver.save_screenshot(str(output))
print(output)The related Python method get_screenshot_as_file(filename) also writes a PNG and returns False for an I/O error. Selenium additionally exposes the image as base64 or raw PNG bytes when you need to upload it instead of creating a file.
What headless Chrome changes
Chrome’s official headless documentation describes headless mode as running Chrome in an unattended environment without visible UI. Selenium still creates a normal WebDriver session; the difference is that Chrome receives the --headless argument through its options.
Chrome’s headless implementation changed in Chrome 112: Chrome creates platform windows but does not display them. The older implementation is available only as the standalone chrome-headless-shell binary from Chrome 132.0.6793.0 onward. If two machines behave differently, record both the Chrome and ChromeDriver versions before changing your test.
Build the driver explicitly
ChromeDriver capabilities are supplied through a ChromeOptions object passed to the driver constructor. The exact constructor and option class names differ between language bindings, but the pattern is the same.
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from selenium import webdriver
from selenium.webdriver.chrome.options import Options
options = Options()
options.add_argument("--headless")
driver = webdriver.Chrome(options=options)Useful display options
Set a deterministic viewport when layout matters. A larger viewport can change responsive breakpoints and therefore the pixels you capture.
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options.add_argument("--window-size=1440,900")Keep options that your environment actually requires separate from screenshot logic. For example, a locked-down container may need an environment-specific sandbox setting; do not copy such flags blindly into local runs because they affect Chrome’s security model.
Wait for the page you intend to capture
driver.get() means navigation completed according to the browser’s navigation strategy. It does not guarantee that a client-side component, lazy image, chart, animation, or API response has finished rendering.
Wait for a condition tied to the evidence in the screenshot. This example waits for a dashboard element to become visible:
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from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC
wait = WebDriverWait(driver, 30)
driver.get("https://example.com/dashboard")
wait.until(EC.visibility_of_element_located((By.CSS_SELECTOR, "[data-testid='dashboard']")))
driver.save_screenshot("dashboard.png")Other page-specific conditions include a status changing from “Loading” to “Ready”, a table containing a required row, or an image’s complete property becoming true. Avoid a universal sleep when a deterministic condition is available. If the page has unavoidable asynchronous work, a short, documented delay can supplement—not replace—a meaningful readiness check.
Capture scope, size, and output
Current window, not an automatic full-page image
The documented Selenium screenshot call captures the current browsing context/current window. The supplied API documentation does not establish a general full-page recipe for the standard call, so do not describe save_screenshot() as a whole-page capture of an arbitrarily long document.
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If your requirement is a full-page artifact, define that requirement separately and choose an approach that explicitly supports it. A viewport screenshot may be exactly right for a visual regression test, while a long-page archive needs a different capture design.
Control dimensions
Use --window-size=width,height before creating the driver. Confirm the resulting dimensions in the session when diagnosing responsive-layout differences:
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PNG bytes or base64
When a test framework stores artifacts itself, use the binding’s byte or base64 screenshot method instead of writing a temporary file. The Python file method remains the simplest portable example and makes I/O failures visible at the call site.
Always close the session
Put driver.quit() in a finally block. It closes every browser window and the WebDriver service even when navigation, waiting, or file writing fails. Calling only driver.close() can leave the session or service process running.
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driver = webdriver.Chrome(options=options)
try:
# navigate, wait, and capture
pass
finally:
driver.quit()Selenium versus Chrome’s direct screenshot command
| Approach | Page interaction | Live WebDriver session | Best fit |
|---|---|---|---|
| Selenium WebDriver screenshot API | Yes: click, scroll, inspect, and wait in code | Required | Existing tests and stateful workflows |
| Chrome headless CLI | No WebDriver interaction; command-line navigation | No | Simple one-off captures |
Chrome’s direct headless CLI can write screenshot.png in the current working directory:
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chrome --headless --screenshot --window-size=412,892 https://example.comThe CLI also supports --timeout, which sets a maximum wait before capture:
chrome --headless --screenshot --window-size=412,892 --timeout=10000 https://example.comThese are Chrome CLI behaviors, not automatic Selenium WebDriver settings. Use Selenium when the page must be manipulated or inspected before the image is taken; use the CLI when navigation and a fixed delay are sufficient.
Equivalent bindings
Other Selenium bindings expose equivalent screenshot operations, but method names and option syntax vary. Consult the API for your language and keep the same sequence: create options, add --headless, construct Chrome, navigate, wait for a page-specific condition, save the current context, and quit. Do not paste Python method names into Java, JavaScript, C#, or Ruby without checking that binding’s API.
Common failures and fixes
“Unable to obtain driver” or session creation failure
- Cause: Chrome, ChromeDriver, or Selenium cannot be found or versions are incompatible.
- Fix: Verify the browser launches on the same machine, inspect the reported versions, update the Selenium package and driver arrangement, and ensure the executable is available to the service account used by CI.
The file is missing or empty
- Cause: The path is relative to an unexpected working directory, or the process lacks write permission.
- Fix: Resolve an absolute path, create its parent directory, check the Boolean return value, and publish the artifact directory from CI.
The screenshot shows a loading shell
- Cause: The script captured immediately after navigation while JavaScript content was still loading.
- Fix: Wait for the specific element or state that proves readiness; increase the explicit wait timeout only after choosing the right condition.
Different layout or clipped content
- Cause: An implicit default viewport, responsive breakpoint, device scale, or browser-version change.
- Fix: Set
--window-size, record the browser version, and keep the same execution image for comparisons.
It works visibly but not in headless mode
- Cause: Timing, viewport, authentication, permissions, or a site behavior differs without a visible UI.
- Fix: Log the URL and readiness state, capture browser and driver logs, set the viewport explicitly, and wait for observable content rather than relying on a human seeing progress.
Chrome exits in a container
- Cause: Container resource limits or environment-specific Chrome restrictions.
- Fix: Check shared-memory and process limits, use only the flags required by your container policy, and reproduce with the same image locally. Treat security-related flags as a deployment decision, not a generic screenshot fix.
Reliability and cost considerations
Selenium itself does not provide a performance benchmark in the documented material. Capture time depends on startup, navigation, network activity, rendering, waits, and file I/O. Reuse a driver for a sequence of captures when test isolation allows it; create a fresh session when isolation is more important than startup overhead.
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For reproducible visual tests, pin the browser version, viewport, timezone, locale, fonts, and test data. Record failures with the URL, window size, browser version, wait condition, and a diagnostic screenshot or page source where policy permits.
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Frequently Asked Questions
Does Selenium’s standard screenshot method capture an entire page?
It captures the current browsing context/current window. The standard documented call should not be treated as a guaranteed full-page capture.
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Which headless argument should I pass to Chrome?
Add --headless to ChromeOptions before constructing the WebDriver.
How do I prevent a screenshot from being taken too early?
Wait for a page-specific condition, such as a required element becoming visible or a loading state changing to ready.
When should I use Chrome’s CLI instead of Selenium?
Use the CLI for simple navigation and timed capture; use Selenium when you must interact with or inspect the page before taking the image.
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