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

Question

I'm using Selenium WebDriver for Python. I want instantiate the browser with a specific width and height. So far the closest I can get is:

driver = webdriver.Firefox() driver.set_window_size(1080,800)

Which works, but sets the browser size after it is created, and I want it set at instantiation. I'm guessing there is an approach along the lines of:

profile = webdriver.FirefoxProfile(); profile.set_preference(foo, 1080) driver = webdriver.Firefox(profile)

But I don't know what foo would be, and I can't figure out where the docs are.

Q1: is there a way to set width / height at instantiation?

Q2: Where are the reference docs listing all keys usable by profile.set_preference?

Honestly, I don't know. Strictly speaking it's different to a window being opened at a specific size (I can see the difference). I don't know whether that difference is material. Seeing as these are tests, I'd like to remove as many unknowns as possible. If someone can tell me that it makes no difference then I'd be happy. But they'd probably need to know the specifics of my test to do that, and I want to be able to do this for all future tests that I write. — tom
– tom, Commented Mar 14, 2013 at 20:49
I would agree with Arran. I can't think of any reason why resize after creation would cause issues. — Robbie Wareham
– Robbie Wareham, Commented Aug 28, 2013 at 9:37

tsorn · Accepted Answer · 2022-04-18 18:32:25Z

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)

sirex · Accepted Answer · 2016-03-15 11:43:05Z

56

Here is how I do it in Python with Selenium 2.48.0:

from selenium.webdriver import Firefox driver = Firefox() driver.set_window_position(0, 0) driver.set_window_size(1024, 768)

answered Mar 15, 2016 at 11:43

sirex

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2 Comments

Bryan Oakley Over a year ago

The OP explicitly says they don't want to set it after creation. The code in the question already shows them using set_window_size.

user337598 Over a year ago

set_window_position(0,0) positions the window about 10 pixels off the left of screen annoyingly.

Steve HHH · Accepted Answer · 2014-02-23 06:20:30Z

For me, the only thing that worked in Java 7 on OS X 10.9 was this:

// driver = new RemoteWebDriver(new URL(grid), capability); driver.manage().window().setPosition(new Point(0,0)); driver.manage().window().setSize(new Dimension(1024,768));

Where 1024 is the width, and 768 is the height.

RoneRackal · Accepted Answer · 2013-03-13 22:16:44Z

Try something like this:

IWebDriver _driver = new FirefoxDriver(); _driver.Manage().Window.Position = new Point(0, 0); _driver.Manage().Window.Size = new Size(1024, 768);

Not sure if it'll resize after being launched though, so maybe it's not what you want

e4c5 · Accepted Answer · 2016-05-11 00:20:02Z

If you are using chrome

 chrome_options = Options() chrome_options.add_argument("--start-maximized"); chrome_options.add_argument("--window-position=1367,0"); if mobile_emulation : chrome_options.add_experimental_option("mobileEmulation", mobile_emulation) self.driver = webdriver.Chrome('/path/to/chromedriver', chrome_options = chrome_options)

This will result in the browser starting up on the second monitor without any annoying flicker or movements across the screen.

Do you know how to do the same trick in Firefox? Maybe you can answer my question.

Raj Sahoo · Accepted Answer · 2017-10-12 13:59:31Z

4

It's easy. Here is the full code.

from selenium import webdriver driver = webdriver.Chrome() driver.get("Your URL") driver.set_window_size(480, 320)

Make sure chrome driver is in your system path.

answered Oct 12, 2017 at 13:59

Raj Sahoo

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3 Comments

Jitin Over a year ago

the question requires you to set the size before instantiating the driver

arun Over a year ago

This works for me

Turkeyphant Over a year ago

This only happens after the window is loaded.

Super Kai - Kazuya Ito · Accepted Answer · 2023-09-12 15:38:36Z

<Chrome>

*-window-size and window-size also work:

from selenium import webdriver options = webdriver.ChromeOptions() options.add_argument("--window-size=1024,768") driver = webdriver.Chrome(options=options)

*This code below also works according to the doc:

from selenium import webdriver driver = webdriver.Chrome() driver.set_window_size(1024, 768)

<Microsoft Edge>

*-window-size and window-size also work:

from selenium import webdriver options = webdriver.EdgeOptions() options.add_argument("--window-size=1024,768") driver = webdriver.Edge(options=options)

*This code below also works according to the doc:

from selenium import webdriver driver = webdriver.Edge() driver.set_window_size(1024, 768)

<Firefox>

*-width and -height also work while width and height don't work:

from selenium import webdriver options = webdriver.FirefoxOptions() options.add_argument("--window-size=1024,768") driver = webdriver.Firefox(options=options)

*This code below also works according to the doc:

from selenium import webdriver driver = webdriver.Firefox() driver.set_window_size(1024, 768)

TONy.W · Accepted Answer · 2013-03-14 17:15:12Z

Here is firefox profile default prefs from python selenium 2.31.0 firefox_profile.py

and type "about:config" in firefox address bar to see all prefs

reference to the entries in about:config: http://kb.mozillazine.org/About:config_entries

DEFAULT_PREFERENCES = { "app.update.auto": "false", "app.update.enabled": "false", "browser.download.manager.showWhenStarting": "false", "browser.EULA.override": "true", "browser.EULA.3.accepted": "true", "browser.link.open_external": "2", "browser.link.open_newwindow": "2", "browser.offline": "false", "browser.safebrowsing.enabled": "false", "browser.search.update": "false", "extensions.blocklist.enabled": "false", "browser.sessionstore.resume_from_crash": "false", "browser.shell.checkDefaultBrowser": "false", "browser.tabs.warnOnClose": "false", "browser.tabs.warnOnOpen": "false", "browser.startup.page": "0", "browser.safebrowsing.malware.enabled": "false", "startup.homepage_welcome_url": "\"about:blank\"", "devtools.errorconsole.enabled": "true", "dom.disable_open_during_load": "false", "extensions.autoDisableScopes" : 10, "extensions.logging.enabled": "true", "extensions.update.enabled": "false", "extensions.update.notifyUser": "false", "network.manage-offline-status": "false", "network.http.max-connections-per-server": "10", "network.http.phishy-userpass-length": "255", "offline-apps.allow_by_default": "true", "prompts.tab_modal.enabled": "false", "security.fileuri.origin_policy": "3", "security.fileuri.strict_origin_policy": "false", "security.warn_entering_secure": "false", "security.warn_entering_secure.show_once": "false", "security.warn_entering_weak": "false", "security.warn_entering_weak.show_once": "false", "security.warn_leaving_secure": "false", "security.warn_leaving_secure.show_once": "false", "security.warn_submit_insecure": "false", "security.warn_viewing_mixed": "false", "security.warn_viewing_mixed.show_once": "false", "signon.rememberSignons": "false", "toolkit.networkmanager.disable": "true", "toolkit.telemetry.enabled": "false", "toolkit.telemetry.prompted": "2", "toolkit.telemetry.rejected": "true", "javascript.options.showInConsole": "true", "browser.dom.window.dump.enabled": "true", "webdriver_accept_untrusted_certs": "true", "webdriver_enable_native_events": "true", "webdriver_assume_untrusted_issuer": "true", "dom.max_script_run_time": "30", }

Thanks. I dont see browser size settings in there, but it's useful to have the list and the link all the same.

Max · Accepted Answer · 2013-08-28 09:38:05Z

0

profile = webdriver.FirefoxProfile() profile.set_preference('browser.window.width',0) profile.set_preference('browser.window.height',0) profile.update_preferences()

write this code into setup part of your test code, before the: webdriver.Firefox() line.

edited Aug 28, 2013 at 9:38

Max

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answered Aug 28, 2013 at 9:16

Deniz Kaplan

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1 Comment

Álvaro Arranz Over a year ago

The question is about setting the initial windows size using python.... Anyway, this doesn't work either using python, at least using selenium 2.46.0 and Firefox 38.0.5

Abhishek Pal Singh · Accepted Answer · 2021-09-09 15:17:19Z

I tried the below code to set the resolution on mac chrome and windows chrome.

driver.manage().window().setSize(new Dimension(1280, 768));

Use the below code to test the resolution changes:-

Dimension dimension = driver.manage().window().getSize(); LOGGER.info("dimension is " + dimension);

leanne · Accepted Answer · 2024-08-26 20:33:45Z

These worked for me in Safari...

from selenium import webdriver ... driver = webdriver.Safari()

then, for...

Window size only:

driver.set_window_size(width, height)

Window size and position:

driver.set_window_rect(x, y, width, height)

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