Features

Interactive PDF Viewing/Rasterization
PDF Image Export (JPEG, TIFF, GIF, PNG, BMP, EMF, and WMF)
Ability to rasterize/print specific regions or subsets of a PDF page
Advanced image quality and compression settings controlling the rasterization process, allowing the user to choose between the output image quality and the rendering speed
Print directly to a printer's device context or create an EMF/WMF spool file
Utility functions dealing with printer setup and print preview
Full transparency support (Transparency Groups, Soft Masks, including all supported Blend Modes)

Intuitive page content extraction based on a concept of graphical elements
High-quality and efficient text recognition engine (pdftron.PDF.TextExtractor). TextExtractor can be used to extract structured Unicode text including style and positioning information from any PDF document. The API is simple to use and has a number of advanced options related to hidden or duplicated text, ligature expansion, etc
Low-level text extraction (including positioning information for text runs and individual characters)
Complete access to the graphics state (for color spaces and colorants, dash properties, etc)
Full access to fonts including glyph outlines
Image extraction. All compression filters allowed in PDF are supported and images can be optionally extracted in raw format
Image color-conversion and normalization filters
Full access to marked content (e.g. used in tagged PDF documents to preserve logical structure or to mark transparency groups)
Full access to page form fields and annotations
Extraction of embedded fonts, ICC color profiles, U3D streams, embedded files, etc
Access to a document's metadata
High-level Logical Structure API and support for 'Tagged' PDF documents

Create new documents from scratch or use existing documents as templates
Copy page content (individual graphical elements) from one page to another
Read/write a PDF document from/to memory buffer or a file on a disk
Create new text, vector art and images
Quick image embedding for TIFF, JPEG, GIF, PNG, and BMP
Support for Type1, OpenType, TrueType, Type3, and CID Font embedding for accurate text reproduction
Support for Unicode text and standard PDF encodings
Dynamic font subsetting resulting in smaller files
Full control over text positioning and character spacing
Support for all PDF color spaces and advanced pre-press options
Full control over content positioning and all graphical attributes available in PDF
Support for PDF patterns (colored and uncolored tiling patterns) and shadings (7 types)
Support for image masks
Reuse of resources such as images, fonts and color spaces through object sharing resulting in smaller and more efficient documents
Intelligent element serialization resulting in small and efficient content streams
Support for explicit and named destinations. Named destinations allow for changes to the document that will not invalidate existing bookmarks
Extensive bookmark creation and editing API
Creation of PDF documents with 3D content (U3D support)
Apply security to new documents
Linearization (Fast Web View)

Remove specific content from existing pages (e.g. based on some property or on positioning information on the page)
Insert or append new content to existing pages
Modify properties/attributes on existing graphical elements (e.g. change font, inter-character spacing, fill color, etc.)
Edit text, images, and paths.
Edit document metadata
Crop and rotate pages
Edit bookmarks and page annotations
Edit every aspect of the document through COS API

PDFNet supports all basic and advanced compression filters allowed in PDF including:

Support for Standard PDF security handler (40 and 128 bit RC4 encryption)
Support for 128 bit AES (Advanced Encryption Standard) encryption
Support for custom security handlers
Support for Crypt encryption filters
Set or modify security permissions associated with a document
Remove encryption from existing PDF documents
Powerful extension mechanism allowing for seamless integration with client applications

PDFNet supports all revisions of the PDF Standard ensuring that the library will work with different documents you may come across.

PDF 1.0
PDF 1.1
PDF 1.2
PDF 1.3 (PDF Revision 1.4, Acrobat 5)
PDF 1.4 (PDF Revision 1.5, Acrobat 6)
PDF 1.5 (PDF Revision 1.6, Acrobat 7)
PDF 1.6 (PDF Revision 1.7, Acrobat 8)
PDF 1.7 (PDF Revision 1.8, Acrobat 9)
ISO PDF (ISO 32000)
ISO PDF/A (ISO 19005-1)
Able to work with corrupt PDF documents (e.g. PDF files with broken cross references etc.) and to correct problems in saved files

Full access to COS (Carousel Object System; Carousel was a codename for Acrobat) API allowing document creation and editing at low level
Seamless integration between high and low-level API
Functionality not available in the high-level API can be implemented using COS/SDF API

PDFNet was designed from ground up with high throughput and current applications in mind.

For speedy document reading, PDFNet uses incremental object loading and caching mechanisms. Caching is used at different levels: from Cos based object caching to more sophisticated color-space, font and glyph caching.
Incremental save for fast serialization and document versioning

PDFNet is not a single SDK, but a family of SDKs which are available on different platforms and programming environments.

.NET - 100% .Net component that can be used from any .NET language (e.g. C#, VB.Net, etc.). PDFNet for .Net is a true .NET component written in managed C++ resulting in significant efficiency gains and optimization opportunities between managed and unmanaged code
ASP.NET - Additional ASP.NET support and extensions
JAVA - The entire PDFNet API is available for JavaTM on all supported platfroms (Windows, Linux, Mac, Solaris, etc)
Cross-platform C/C++ Library. Currently available for Windows (NT4, 2000, XP, Vista, Server
2008), Linux, Solaris, and Mac OSX. Source code can be licensed to support new platforms
ActiveX - Available for Windows (NT4, 2000, XP, Server 2003)