The newer versions of Firefox include a PDF viewer enabled by default when you install or upgrade the browser. There is no need to install an add-on or use an external application to open PDF files on ...

本文介绍了PDF-XChange Viewer这款功能丰富的PDF阅读工具的使用方法。该软件不仅完全免费，还具备多种实用功能，如添加各类标注、多标签页浏览、快速批量搜索、页面放大与导航等，极大提升了阅读体验。它支持将PDF内容导出为图像，操作便捷，效率高。

The PDF viewer you choose is really dependent on what you need to do with the PDFs you download, but when it comes to viewing and editing PDFs, PDF-XChange Editor is the best program around. [jump] ...

The best free PDF reader apps do more than just act as a PDF viewer - any modern browser can do that. What I'm looking for is tools that go beyond that, offering commenting, collaboration, and ...