How to: Set default printer paper size on a Mac (Firefox)

The Apple operating system, OS X, it is setup by default to use the US Letter format under the "Print & Scan" settings page (you can find this page under "System Preferences"). If you are running into issues printing labels, this could be one reason.

To resolve this, follow these steps:
 Mac OSX 10.6 and earlier will not let you set a custom default print size. For these instructions for Chrome, click here.

  1. Navigate to the File menu to find Page Setup.

  2. Select Format For and then click Any Printer.

  3. Choose the correct paper size.


  4. If printing any size besides "Letter" you'll need to add a custom paper size.  If you are printing to a "Letter" size, skip to step 9.

  5. Select Manage custom sizes at the bottom of the Paper Size menu.


  6. Change the name by single clicking on "Untitled". We recommend changing the name to something you will remember, such as "4x6".


  7. Set the Paper Size to the correct width and height. For example, width: 4 inches; height: 6 inches


  8. Leave the "Non-Printable Area" set to "User Defined" and change the margins if necessary - we suggest a very small margin or no margin. 

  9. Click OK on the "Custom Paper Sizes" page to save your changes.

  10. Click OK on the "Page Setup" page.

  11. Find your label you want to print. Press Command + P

  12. Make sure Ignore Scaling and Shrink To Fit Page Width is checked.


  13. Press Print.



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