How to Change the Default Print Size on a Mac

To change the default paper size for printing, click the Apple menu → click System Preferences → click Printers & Scanners → click the Default Paper Size menu and choose your new size. Click the Apple menu.

Part 1 of 2:

Setting a Paper Size

Click the Apple menu.
Click System Preferences. If a submenu opens instead, click the Show All button at the top of the window.
Click Printers & Scanners.
Click the Default Paper Size menu.
Click the paper size that you want to set as default.^[1]

Part 2 of 2:

Creating a Custom Paper Size

Click the File menu in any app that can print. You'll need to open the system Print window to set a custom paper size.
Click Print.
Click Show Details.
Click the Paper Size menu.
Click Manage Custom Sizes.
Click the + button.
Type a name for the custom size.
Type the paper dimensions.
Type the non-printable area dimensions.
Click OK.
Select your new size using the method above. Your new custom size will appear at the bottom of the Default Paper Size menu.

click size paper menu

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