PDFpen is a PDF editor for macOS and iOS (iPadOS). It allows users to create, edit, annotate, and sign PDF documents. It offers a range of features including :

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Editing text and images:

You can directly edit text within PDFs, add, delete, and resize images.
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Annotation tools:

Includes tools for highlighting, underlining, strikethrough, adding comments, drawing shapes, and adding stamps.
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Form filling and creation:

Fill out existing PDF forms and create your own interactive forms.
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Digital signatures:

Add legally binding digital signatures to documents.
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Optical Character Recognition (OCR):

Converts scanned documents into editable text.
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PDF creation:

Create PDFs from various file types.
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Security features:

Password protect and encrypt PDFs.

Essentially, it[SQ]s a comprehensive PDF solution aimed at individuals and professionals who need to work with PDF documents regularly, offering more robust features than a simple viewer. There are different versions available, with varying feature sets and pricing.