The application’s pull-down menus list many items. However, if you hold down the Option or Command keys--either before opening a menu or while a menu is open--some menu items can change. Use the Option and or Command keys when choosing a special item from the dynamic menu.

Choose File > New > Blank Document from the menu. Choose a page orientation in the New Page window. By default, a blank page will be selected. Click “Choose” or tap the Return/Enter key to confirm. Insert a page into the PDF by choosing Edit > Insert Blank Page (Command+Option+B), or drag a page thumbnail from an open PDF and drop it in. Choose File > Duplicate (or File > Save As) to give the PDF a name.

To compress a scanned document, see Reducing Document File Size.

Control how you view your documents. The application enables opening documents in separate windows as well as opening documents in separate tabs. This allows users to view multiple documents simultaneously.

In Page View, you can zoom in and out of your page or document with the Zoom In and Zoom Out controls

Switch between Sidebar views using the Sidebar button in the toolbar. For more on the Sidebar see Sidebar.

PDFpen is a Mac-based app and leverages the macOS for many of its capabilities such as font support, scanning, and printing.

When you initially launch the application, you will see a welcome window. This window provides an overview of the most common tasks and provides convenient links to helpful resources for more information.

To set your macOS default PDF application:

Nitro PDF Pro aims to provide good assistive support for users who may need it. To see which accessibility shortcuts the application currently supports, choose Nitro PDF Pro > Services > Services Preferences > Accessibility.