How to set window size using phantomjs and selenium webdriver in Python?

We can set window size using PhantomJS and Selenium webdriver in Python. PhantomJS is a headless browser that allows automated testing without displaying a GUI. To work with PhantomJS, we create a driver object of the webdriver.PhantomJS class and pass the path to the phantomjs.exe driver file as a parameter.

To set the window size, we use the set_window_size method and pass the width and height dimensions as parameters. We can also retrieve the current window size using the get_window_size method.

Syntax

driver.set_window_size(width, height)
print(driver.get_window_size())

Parameters

• width − The desired window width in pixels
• height − The desired window height in pixels

Example

Here's how to create a PhantomJS driver, set a custom window size, and verify the dimensions ?

from selenium import webdriver

# Set phantomjs.exe path
driver = webdriver.PhantomJS(executable_path="C:\phantomjs.exe")

# Maximize window initially
driver.maximize_window()

# Launch URL
driver.get("https://www.tutorialspoint.com/index.htm")

# Set new window size (width=800, height=880)
driver.set_window_size(800, 880)

# Obtain and print current window size
print(driver.get_window_size())

# Close the driver
driver.quit()

Output

{'width': 800, 'height': 880}

Key Points

• PhantomJS is deprecated − Consider using Chrome or Firefox in headless mode instead
• Window size affects rendering − Some responsive websites display differently based on window dimensions
• Always call quit() − This ensures proper cleanup of browser resources

Alternative: Using Chrome Headless

Since PhantomJS is deprecated, here's the modern approach using Chrome headless ?

from selenium import webdriver
from selenium.webdriver.chrome.options import Options

# Configure Chrome options
chrome_options = Options()
chrome_options.add_argument("--headless")
chrome_options.add_argument("--window-size=800,880")

# Create Chrome driver
driver = webdriver.Chrome(options=chrome_options)

# Launch URL and get window size
driver.get("https://www.tutorialspoint.com/index.htm")
print(driver.get_window_size())

driver.quit()

Conclusion

Use set_window_size() to control browser dimensions in PhantomJS. However, since PhantomJS is deprecated, consider migrating to Chrome or Firefox headless mode for better performance and ongoing support.