PDF Extra for Windows is a PDF editor and reader application developed by Soda PDF. It offers a range of features beyond basic PDF viewing, allowing users to create, edit, annotate, and convert PDF files. Features typically include :

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PDF Creation:

Creating PDFs from various file types (e.g., Word, Excel, images).
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PDF Editing:

Editing text and images within existing PDFs.
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Annotation:

Adding comments, highlights, sticky notes, and other annotations to PDFs.
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Form Filling:

Completing and saving fillable PDF forms.
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Conversion:

Converting PDFs to and from other formats like Word, Excel, JPG, etc.
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Security:

Protecting PDFs with passwords and permissions.
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Optical Character Recognition (OCR):

Making text in scanned images searchable and editable.
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e-Signature support:

Adding electronic signatures to documents.


In short, PDF Extra aims to be a comprehensive PDF solution for Windows users, providing a wider array of functionalities than a simple PDF reader. There are often different subscription tiers offering varying levels of features.