How to open more than one window of a Mac OS app

Posted on Categories Mac
How to open more than one window of a Mac OS app

Updated 8th August 23 – Updated to make the process much easier, allowing you to just type the app’s name rather than its full path and filename.


It’s not easy to open multiple windows of many MacOS apps, but with a simple trick you can open apps as many times as you want.

For the most part, Mac OS is great, and helps us be super productive. However, one thing that’s always annoyed me is how you can only open one instance, or one window, of certain apps.

While apps like Chrome, Safari, Word and the like will all let you open as many windows as you want, so you can work on multiple things at the same time, other applications don’t give you this functionality.

Even simple apps like Calculator only let you open one window – so you’re out of luck if you want to calculate a few different things at once. Similarly, FileZilla, one of the most popular FTP clients, won’t let you open more than one window.

Thankfully, using Terminal, opening more than one instance of an app in Mac OS is a breeze.  And don’t worry, while Terminal may look terrifying, the command you need to type is very simple.


Just press + Space on your keyboard, type Terminal, and hit enter.

Or click the Search icon at the top-right of your screen to open Spotlight, type ‘terminal’, and hit enter.

Then, type:

open -n -a Appname

Where Appname is the name of the app you want to open multiple windows of.

For example:

open -n -a Calculator

For apps with spaces in the name, you just need to wrap them in quotation marks, like so:

open -n -a "Adobe Photoshop 2023"

The -a flag tells Terminal that it’s opening an app from your Applications folder, meaning there’s no need to type the file’s full path.

However, you can also type the app’s filename, which ends in .app:

open -n /Applications/Appname.app

The filename is the name of the app in your applications folder, with .app to the end.

If there’s a space in the application name, you need to escape this with a backslash, so type a backslash before the space. So to open Google Chrome, for example, you’d type:

open -n /Applications/Google\ Chrome.app

Or, you can use the double-quotation mark trick again, like so:

open -n "/Applications/Google Chrome.app"

How to open Calculator more than once in Mac OS

To open Calculator multiple times on a Mac, open your terminal, then type or copy and paste the following:

open -n -a Calculator

You can do this as many times as you want, to open as many calculators as you want.


How to open FileZilla more than once in Mac OS

To open FileZilla multiple times on a Mac, open your terminal, then type or copy and paste the following:

open -n -a Filezilla

You can do this as many times as you want, to open as many FileZilla windows as you want.