Alternatively, you may export the script as an application (.app) and run it anytime with a double-click. Now you can press Cmd + R to run the script.

You can set a different default height and width through the appHeight and appWidth variables. The script resizes the window to 1920x1080 and moves it to the center. You can change the app name (theApp) from “Google Chrome” to iTunes or any other window that you wish to resize. Just open the AppleScript editor and copy-paste the script below. If you are looking for something more simple, without the extra bells and whistles, a little AppleScript should do the trick. I did find some paid alternatives in the Mac App store - Mercury Mover, TileWindows and Divvy to name a few - that do allow you to reposition and resize windows on the Mac with keyboard shortcuts but these apps are more targeted at power users for working efficiently with multiple windows while Sizer is purely a resizing utility. Resize any window to a specified size with Apple Script Surprisingly, there’s no Sizer like app available for the Mac platform. For instance, when I am recording screencasts for the YouTube channel, I use the 1280x720 (HD) or 1920x1080 (1080p) preset to automatically resize the target window before hitting the Record button. One of my favorite Windows utility happens to be Sizer, a tiny app that can resize any window on the desktop to an exact size.