Invoicing your customers has never been easier if you're using QuickBooks Online! The options to customize your invoices are vast, and you can choose from tons of different settings and format options to make your invoice have the look and feel you desire. I'll explain the limitations of the customization options when it comes to adding page numbers to multi-page invoices.
While you're able to add invoice numbers, the option to add page numbers isn't available at this time. I know how helpful this would be, especially for customers who may be printing their invoices and want to keep track of the pages in order. I'd encourage you to make a suggestion about this to our engineers by clicking the Gear icon > Feedback. I'd be happy to pass this along as well.