Q: How do I create a custom paper size for printing in Windows 7?

Open the Devices and Printers control panel applet.

Create a new form size by selecting Print server properties.

On the Forms tab, select Create a new form; enter a name and select the attributes, then click OK (see screen shot below).

Windows 7 Print server properites

Right-click the printer, and select its Printing preferences (see screen shot below).

Windows 7 Printers and Faxes Printing preferences

Select the Layout tab, and click Advanced.

Under Paper/Output, select the new custom form created for Paper Size, then click OK.