itro PDF Reader是最近发布的一款免费的多功能pdf阅读器，除标准的PDF阅读功能（阅读、注释、导航、表单）外，Nitro PDF Reader还会自动安装一个Nitro PDF Creator的虚拟打印机，可以轻松制作PDF文件。
功能特点：
可以提取PDF内容文件，文本和图像。
更新日志
5.5.6.21
* Type Text Smart Alignment provides dynamic visuaguides to accurately align typed text in reference.
to other text, form fields, annotations, images, shapes, and other page elements.
* Spellcheck available in aleditable text fields and text-based annotationsEnhancements.
* Upgraded Interface maintains the Microsoft Office 2013 look and feel.
* Multi-Thread Rendering loads documents even quicker.
* QuickSign feature supports signature capture via webcam and also by hand on touch display.
* Rendering improvements.
* Generaperformance enhancementsResolved Issues.
* Security vulnerability identified and resolved.
* Multiple bug fixes and updates.
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