How to Change the Default Print Size on a Mac

By Update

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

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    Click the Apple menu.
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    Click System Preferences. If a submenu opens instead, click the Show All button at the top of the window.
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    Click Printers & Scanners.
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    Click the Default Paper Size menu.
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    Click the paper size that you want to set as default.[1]
Part 2 of 2:

Creating a Custom Paper Size

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    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.
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    Click Print.
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    Click Show Details.
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    Click the Paper Size menu.
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    Click Manage Custom Sizes.
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    Click the + button.
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    Type a name for the custom size.
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    Type the paper dimensions.
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    Type the non-printable area dimensions.
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    Click OK.
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    Select your new size using the method above. Your new custom size will appear at the bottom of the Default Paper Size menu.

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