How to set browser’s width and height in Selenium WebDriver?

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Here’s a solution that works with both headless and non-headless mode and will start the window with the specified size instead of setting it after:

Chrome:

from selenium.webdriver import Chrome, ChromeOptions

opts = ChromeOptions()
opts.add_argument("--window-size=2560,1440")

driver = Chrome(options=opts)

Firefox:

from selenium.webdriver import Firefox, FirefoxOptions

opts = FirefoxOptions()
opts.add_argument("--width=2560")
opts.add_argument("--height=1440")

driver = Firefox(options=opts)

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