• 支持文檔的許多屬性，例如：文檔信息，帶有自定義屬性的XMP元數(shù)據(jù)以及瀏覽器參數(shù)

• 每個(gè)文檔的頁(yè)數(shù)不受限制，每頁(yè)都有它自己的大小和在文檔中的定位

• 可隨機(jī)讀取文檔中的任一頁(yè)

• 標(biāo)題模板，腳注模板和頁(yè)面模板

• 支持羅馬和阿拉伯?dāng)?shù)字 對(duì)頁(yè)碼進(jìn)行自動(dòng)編號(hào)

• 當(dāng)采用基于網(wǎng)格的設(shè)計(jì)方式在頁(yè)面中放置內(nèi)容時(shí)，在PDF頁(yè)中移動(dòng)類似于在屏幕中移動(dòng)。同時(shí)這個(gè)庫(kù)允許創(chuàng)建用戶自定義單元和坐標(biāo)系統(tǒng)

• 支持繪圖的基本要素（線、多線、弧、餅圖、長(zhǎng)方形、橢圓、貝塞爾曲線）。所有的基本元素都可被畫出或者填充，開發(fā)者可全權(quán)控制所有的線性系統(tǒng)。同樣PDF4NET庫(kù)也可支持對(duì)區(qū)域的裁剪

• RGB、CMYK、Gray色彩空間

• 支持圖像格式，包括jpeg、gif、bmp、png、emf；圖像可以按比例或進(jìn)行旋轉(zhuǎn)后放置在頁(yè)面的任何位置；嵌入式的圖像是放在高速緩存中的，因此當(dāng)同一幅圖像在PDF文件中被多次使用時(shí)，它僅僅只被嵌入一次。圖像可以從文件、數(shù)據(jù)流或者系統(tǒng)中載入。畫圖。位圖。通過缺省值來支持透明圖像，同樣也支持顏色鍵和圖像屏蔽

• CCITT G4 用于B/W圖像的壓縮。Tiff2PDF應(yīng)用有益于這個(gè)特性。使用帶有自動(dòng)文字包的單文本或文本框能支持各種文本設(shè)計(jì)，這些單文本或文本框也具有自動(dòng)文本對(duì)齊（左對(duì)齊、居中對(duì)齊、右對(duì)齊、或者水平對(duì)齊、或者頂對(duì)齊、垂直對(duì)齊和底對(duì)齊）和自動(dòng)旋轉(zhuǎn)的特性

• 當(dāng)拖動(dòng)文本的時(shí)候，支持HTML格式標(biāo)識(shí)符

• 支持14種基本字體，Type1 字體, Unicode TrueType字體, System.Drawing. 字體和CJK字體這些字體來自Adobe亞洲語(yǔ)言包（Adobe Asian Language pack）。Type1 字體和TrueType字體能夠被嵌入到PDF文檔中，對(duì)于TrueType字體，這個(gè)庫(kù)能使得字體的子集自動(dòng)的減小嵌入式字體的大小。字體都在高速緩存中，因此只能有一種字體被嵌入到最終的PDF文件中。

• 支持PDF超鏈接和文檔書簽。超鏈接的目標(biāo)可能是同一文檔中的一頁(yè)，也可能是另外PDF文檔，或外部非PDF文件，或web中的URL

• 在文檔、頁(yè)和書簽中都支持PDF Actions。只用幾行代碼就能控制PDF文檔的打開，或者控制向開發(fā)者的PDF文檔中添加JavaScript代碼。支持PDF安全規(guī)范?？梢詫?duì)文檔進(jìn)行加密和密碼保護(hù)，包括用戶和所有者的密碼。庫(kù)支持40位和128位的密匙。同時(shí)，使用訪問權(quán)限來限制對(duì)文檔的操作（允許打印，允許文檔組合，允許內(nèi)容的提取等等）

• PDF文件可以被存儲(chǔ)為文件或者數(shù)據(jù)流，包括HTTP輸出流
     當(dāng)庫(kù)用于web應(yīng)用程序時(shí)，可以通過壓縮PDF文件的內(nèi)容，以減小文件的大小和下載時(shí)間

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