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• 支持文档的许多属性，例如：文档信息，带有自定义属性的XMP元数据以及浏览器参数

• 每个文档的页数不受限制，每页都有它自己的大小和在文档中的定位

• 可随机读取文档中的任一页

• 标题模板，脚注模板和页面模板

• 支持罗马和阿拉伯数字 对页码进行自动编号

• 当采用基于网格的设计方式在页面中放置内容时，在PDF页中移动类似于在屏幕中移动。同时这个库允许创建用户自定义单元和坐标系统

• 支持绘图的基本要素（线、多线、弧、饼图、长方形、椭圆、贝塞尔曲线）。所有的基本元素都可被画出或者填充，开发者可全权控制所有的线性系统。同样PDF4NET库也可支持对区域的裁剪

• RGB、CMYK、Gray色彩空间

• 支持图像格式，包括jpeg、gif、bmp、png、emf；图像可以按比例或进行旋转后放置在页面的任何位置；嵌入式的图像是放在高速缓存中的，因此当同一幅图像在PDF文件中被多次使用时，它仅仅只被嵌入一次。图像可以从文件、数据流或者系统中载入。画图。位图。通过缺省值来支持透明图像，同样也支持颜色键和图像屏蔽

• CCITT G4 用于B/W图像的压缩。Tiff2PDF应用有益于这个特性。使用带有自动文字包的单文本或文本框能支持各种文本设计，这些单文本或文本框也具有自动文本对齐（左对齐、居中对齐、右对齐、或者水平对齐、或者顶对齐、垂直对齐和底对齐）和自动旋转的特性

• 当拖动文本的时候，支持HTML格式标识符

• 支持14种基本字体，Type1 字体, Unicode TrueType字体, System.Drawing. 字体和CJK字体这些字体来自Adobe亚洲语言包（Adobe Asian Language pack）。Type1 字体和TrueType字体能够被嵌入到PDF文档中，对于TrueType字体，这个库能使得字体的子集自动的减小嵌入式字体的大小。字体都在高速缓存中，因此只能有一种字体被嵌入到最终的PDF文件中。

• 支持PDF超链接和文档书签。超链接的目标可能是同一文档中的一页，也可能是另外PDF文档，或外部非PDF文件，或web中的URL

• 在文档、页和书签中都支持PDF Actions。只用几行代码就能控制PDF文档的打开，或者控制向开发者的PDF文档中添加JavaScript代码。支持PDF安全规范。可以对文档进行加密和密码保护，包括用户和所有者的密码。库支持40位和128位的密匙。同时，使用访问权限来限制对文档的操作（允许打印，允许文档组合，允许内容的提取等等）

• PDF文件可以被存储为文件或者数据流，包括HTTP输出流
     当库用于web应用程序时，可以通过压缩PDF文件的内容，以减小文件的大小和下载时间

PDF4NET is a .NET library for generating and importing pdf documents on the fly from any .NET application. The library does not rely on any Adobe products for creating and importing pdf files. It hides the complex structure of pdf files behind a simple object model that allows creation of complex pdf files or import of existing pdf files with a few lines of code. The PDF4NET library follows the GDI+ model, thus reducing the learning time and increasing productivity. It uses a grid based layout approach allowing precise positioning of content on document's pages. The final pdf file is compressed, making the library apropriate for web applications. The library can be used both from WinForms and WebForms (ASP.NET) applications without any restrictions. Also, the same package includes a Compact .NET Framework edition of the library. The library is written entirely in C#, being 100% managed.

The PDF4NET library is licensed per developer and can be distributed ROYALTY FREE, reducing your project costs

PDF4NET provides support for the following features when creating PDF files:

• Support for document wide properties like: document information and XMP metadata with custom properties, viewer preferences
• Unlimited number of pages per document, each page with its size and orientation
• Random access to any page in the document
• Headers, footers and page templates
• Automatic page numbering with support for roman and Arabic numerals
• Grid based layout when placing content on page, in this way drawing on a PDF page is much like drawing on the screen. The library also allows creating user defined units and coordinate systems
• Support for basic drawing primitives (lines, poly lines, arcs, pies, rectangles, ellipses, Bezier curves). All primitives can be stroked or filled, and developer has full control over lines styles. Clipping regions are also supported by PDF4NET library
• RGB, CMYK and Gray color spaces
• Support for images, including jpeg, gif, bmp, png, emf; images can be placed anywhere on the page, scaled and rotated; Embedded images are cached, so when the same image is used multiple time in the PDF file, it is embedded only once. Images can be loaded from files, streams or System.Drawing.Bitmap. Transparent images are supported by default, support for color key masking and image masking being also included
• CCITT G4 compression for B/W images. Tiff2PDF applications will benefit most of this feature
  Support for various text layouts using single text lines or text boxes with automatic word wrapping, text alignment (left, center, right or justified on horizontal, or top, middle bottom for vertical) and rotation
• Support for HTML formatting tags when drawing text
• Support for base 14 fonts, Type1 fonts, Unicode TrueType fonts, System.Drawing.Font and CJK fonts from Adobe Asian Language pack. Both Type1 and TrueType fonts can be embedded in the PDF document, and for TrueType fonts the library performs font sub setting automatically to reduce the size of the embedded font. The fonts are cached, so only one instance of the font is embedded in the final PDF file
• Support for PDF hyperlinks and document bookmarks. The target of a hyperlink can be a page in the same document, an external PDF file, an external non PDF file or a URL on the web
• PDF Actions are supported at document, page and bookmark level. Control how the PDF document is opened or add custom JavaScript code to your PDF document with a few lines of code
  Support for PDF security specification. Documents can be encrypted and password protected, both with user and owner passwords. The library supports both 40bit and 128bit encryption keys. Also, operations on a document can be restricted using access rights (allow print, allow assemble, allow content extraction, etc).
• PDF files can be saved to file or stream, including HTTP output streams
  The content of PDF files is compressed to reduce file size and download times when the library is used from a web application