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Repair Windows errors before they cause bigger problemsFix Now →Scan for outdated or missing drivers - takes under a minuteDriver Scan →To capture a webpage at a mobile viewport size with Selenium and Chrome, configure Chrome’s mobile emulation before creating the WebDriver session, load the page, wait for the content you need, then save the current-window screenshot. Resizing a browser window is useful for responsive-layout checks, but it is not the same as enabling mobile emulation.
Set up Chrome mobile emulation and capture the viewport
Use explicit device metrics when you need a particular viewport. The dimensions below are illustrative CSS-pixel values, not a universal phone profile. Choose dimensions and pixel ratio that match your test case. See Selenium’s Chrome options documentation for mobile-emulation configuration and the Python WebDriver API reference for screenshot behavior.
from selenium import webdriver
from selenium.webdriver.chrome.options import Options
from selenium.webdriver.support.ui import WebDriverWait
options = Options()
options.add_experimental_option("mobileEmulation", {
"deviceMetrics": {
"width": 390,
"height": 844,
"pixelRatio": 3.0,
}
})
driver = webdriver.Chrome(options=options)
try:
driver.get("https://example.com")
# Replace this with a condition for the page's real ready state/content.
WebDriverWait(driver, 10).until(
lambda d: d.execute_script("return document.readyState") == "complete"
)
ok = driver.save_screenshot("mobile-viewport.png")
if not ok:
raise RuntimeError("Screenshot file could not be saved")
finally:
driver.quit()The example waits for the document’s load state. If the page fills in content asynchronously, wait for a relevant element or condition instead; navigation completing does not guarantee that every later asset has rendered. save_screenshot captures the current window as a PNG and returns a boolean indicating whether saving succeeded.
Choose the right kind of mobile-size test
Window resizing for responsive layout
Selenium’s set_window_size(width, height) changes the browser window dimensions. Use it when you want to inspect a page in a narrower desktop browser window. It does not, by itself, configure all the device metrics used by Chrome’s mobile emulation. Selenium documents window management and screenshots in its Working with windows and tabs guide.
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Mobile emulation for mobile rendering metrics
Configure Chrome mobile emulation before creating the driver when the page must respond to emulated mobile device metrics such as width, height, and pixel ratio. ChromeDriver describes this configuration as emulating a mobile device in its mobile emulation guide. An emulated capture represents that browser configuration; it is not proof that the page behaves identically on every physical phone or mobile browser.
Use a named device preset or custom metrics
A supported named preset can be convenient when the test should follow a device profile. Selenium’s JavaScript API demonstrates a Pixel 10 preset; available names can depend on the installed Chrome and ChromeDriver versions. When exact dimensions matter, custom metrics make the requested width, height, and pixel ratio explicit.
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const chrome = require('selenium-webdriver/chrome');
const options = new chrome.Options().setMobileEmulation({
deviceMetrics: { width: 360, height: 640, pixelRatio: 3.0 }
});The same Selenium JavaScript Options API documents the setMobileEmulation({deviceName: ...}) form for presets. Confirm that the preset is supported by the Chrome/ChromeDriver version used for the session.
Capture the current window or a specific element
For a mobile viewport screenshot, use the current-window method shown above. Selenium also provides element screenshot operations when the requirement is to capture one selected element rather than the viewport. These outputs answer different questions: a viewport capture shows the visible browser area, while an element capture focuses on the chosen page element.
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Check the output and diagnose common problems
- The page still looks like desktop. Confirm that mobile emulation is configured on the Chrome options before
webdriver.Chrome()creates the session. A window resize alone is not equivalent. - The screenshot misses late-loading content. Replace the generic document-ready wait with a wait for the actual content, selector, or application state required by the test.
- The saved file has unexpected dimensions. Check whether your expected dimensions refer to CSS viewport metrics or raster image pixels. Account for the configured pixel ratio and the browser/driver environment; the configuration references do not promise identical raster dimensions across every environment.
- The screenshot was not saved. Check the return value from
save_screenshot; it reports success or failure. Also confirm that the process can write to the destination path. - A named device is not recognized. Preset availability can depend on Chrome and ChromeDriver versions. Use explicit custom metrics when you need fixed dimensions.
- The capture differs from a real phone. Treat emulation as evidence for the configured test setup, not a substitute for validating behavior on the physical devices and browsers your users rely on.
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Frequently Asked Questions
Does Selenium’s current-window screenshot save a PNG?
Yes. Python’s driver.save_screenshot("file.png") saves the current-window image as a PNG and returns a boolean result.
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Does a mobile-emulation screenshot prove how a page works on every phone?
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