To print on a custom paper size on a Mac, create a new custom paper size, and then select the new size for the print job. Choose a method to create a custom paper size, depending on the File menu options in your application. If your File menu includes both a Page Setup and a Print option, choose the Page Setup option.
Create a custom paper size from the Page Setup menu
Create a custom paper size using the Page Setup option on the File menu of your application, and then select the new custom size for the print job.
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Load the custom-size paper into the paper input tray.
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Open the item you want to print.
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Click File, and then select Page Setup.
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In Paper Size, select Manage Custom Sizes.
The Custom Paper Sizes window displays.
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In the Custom Paper Sizes window, click the plus sign

to create a new paper size, double-click the default untitled name, and then type a new name for the custom paper size.
note:
Use a different, unique name for the new custom paper size. Do not use an existing paper size name for any new custom paper size names because it overrides the existing preset. For example, if a custom paper size is named A4, then the existing A4 paper size is no longer available as a choice.
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In the Paper Size section, type the dimensions of the custom paper in the Width and Height text boxes, and then set the margins, if
desired.
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Paper Size
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Margins
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Click OK.
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In the Page Setup window, select the new custom paper size, and then click OK.
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Click File, and then select Print.
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Change print settings, if desired, and then click OK or Print to print the document.
Create a custom paper size from the Print menu
Create a custom paper size using the Print option on the File menu of your application, and then select the new custom size for the print job.
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Load the custom-size paper into the paper input tray.
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Open the item you want to print.
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Click File, and then select Print.
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In Paper Size, select Manage Custom Sizes.
The Custom Paper Sizes window displays.
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In the Custom Paper Sizes window, click the plus sign

to create a new paper size, double-click the default untitled name, and then type a new name for the custom paper size.
note:
Use a different, unique name for the new custom paper size. Do not use an existing paper size name for any new custom paper size names because it overrides the existing preset. For example, if a custom paper size is named A4, then the existing A4 paper size is no longer available as a choice.
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In the Paper Size section, type the dimensions of the custom paper in the Width and Height text boxes, and then set the margins, if
desired.
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Paper Size
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Margins
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Click OK.
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In the print preview window, select the new custom paper size.
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Change print settings, if desired, and then click OK or Print to print the document.