Using Order Printer
You can use the Order Printer app to print invoices and packing slips from an order's page in your Shopify admin.
Print with Order Printer from the Shopify admin
To use the Order Printer app in your Shopify admin:
From your Shopify admin, go to Orders.
Select the order that you want.
Click More actions > Print with Order Printer:
In the Templates section, select the documents that you want to print.
Print with Order Printer from Shopify POS
To use the Order Printer app in Shopify POS:
From the order confirmation page, tap Apps.
Tap Print with Order Printer app.
Choose to print an invoice, a packing slip, or both.
When you're done, tap Print.
Select a default Order Printer template
You can select a template that the Order Printer app will print by default.
To select a default Order Printer template:
From your Shopify admin, go to Apps.
Click Order Printer to open the app.
Click Manage templates in the app header.
Select which templates to Print by Default:
Remove the header and footer from printed pages
Most browsers add a header and footer automatically to every page they print. You can remove these to give your documents a cleaner, more professional look. Each browser has a different way to remove these:
In general, you need to uncheck the option in the browser's print window for the headers and footers.
Save a document as a PDF file
Order Printer uses your browser's print function to print documents. You can use this function to save your documents as PDF files. Each browser and operating system handles saving to PDF a little differently:
Google Chrome on Mac OS X or Windows
If you're using the Google Chrome browser, then you can save to a PDF directly from the print dialog. Under Destination, click Change... and then select Save as PDF:
Mac OS X
Mac OS X's print dialog lets you print to PDF from any browser. In the print dialog box, select PDF on the bottom left and then select Save as PDF...:
For browsers other than Google Chrome on Windows, you can use software like CutePDF to save to PDF from any print dialog. On Windows 10, you can specify that you want to save as PDF in the Print window.