Occasionally I need to produce YouTube HD videos showing me doing something in a web browser. Up ’till now I’ve had to painfully, manually resize the browser window to 1280×720 so that the video didn’t get unnaturally shrunk or expanded by my screencast rendering software. Tonight I figured out a way to automatically resize my browser window to the exact dimensions using AppleScript.

Here is the magical incantation:

tell application “Safari”

set the bounds of the first window to {0, 0, 1280, 720}

end tell

Run this application in AppleScript Editor (/Applications/Utilities/AppleScript Editor) and your browser will be the perfect size for recording movies. You can save the script to a folder for later reuse.