Saving the invoice to PDF can be done by using something called PDF Print Driver. This is also known as
because the output from the browser is sent to a file instead to a printer.
This functionality is built-in in some browsers (like Google Chrome), while in others (like Firefox or Internet Explorer) you have to install PDF printer manually.
Here I will show you how to do it with
Google Chrome, but if you are using another browser you can install free PDF printer like
Bullzip and use it the same way.
To save the invoice to PDF, all you need to do is click "Print Invoice", set the destination printer to "Save as PDF" and click Save.