如果你在电脑上阅读大量pdf格式的学术文章以及书籍，可能经常会想到标注重点内容。但是pdf游览器做不到这一点。如果你要打印出来后在用荧光笔标注可能浪费纸张，也不符合低碳经济的要求。

PDF Annotator是个非常好的PDF文件标注软件，用此软件你可以随便对文件的任何部位进行标注。标注功能包括荧光笔，下划线，和很多其他图标，而且可以在文件里写入你的感受。令人兴奋的是，你可以保存你的标注内容。下次打开的时候你完全可以看到你保存的重点内容。

PDF Annotator 会让你读电子书的感受完全接近读纸张版的书。


PDF Annotator®Annotate, Edit and Comment PDF files。
Comment and Markup

Annotations can be added using the pen in almost any color and different pen widths. Simply write your comments directly into the document!

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Auto-Smooth

PDF Annotator's intelligent logic recognizes attempts to draw straight lines, and turns them into perfectly straight lines. Especially useful for underlining, striking out, or emphasizing text manually.

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Full Screen Mode

Use PDF Annotator in full screen mode for your presentations to be able to mark up and complete your slides or worksheets live on the screen.

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Fly-in Toolbars

Make use of the unique fly-in toolbars in full screen mode, which don't occupy much space, but are available at any time.

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Page Layout Modes

Select between single page and two pages, whole page and continuous view.

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Tool Configuration

Freely configure the tools in your toolbox. Create the tools you need without restriction.

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Text Tool Options

All tools support various style properties, like different colors, borders, fonts and widths.

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Stamps

Re-use symbols, drawings, images or text boxes and use them as stamps.

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Page Management

Insert, clone, delete or reorder pages or even insert or append complete documents so you can merge multiple documents into a single one.

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Page Preview

Quick expandable thumbnail view with multi-select support for all page operations.

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Rotate Pages

Permanently rotate single page or the entire document.