yudufreedom是一个提供PDF文档相关服务的网站，我们可以通过yudufreedom在线存储、浏览、发布以及分享PDF文档。
无需注册便可以使用yudufreedom提供的各种服务，上传PDF文档时需要输入你的email地址，然后对PDF文档标题、分类以及tag进行设定以便分享，很快就会在email收到一个链接，点击链接即可进入PDF文档阅读页面，这个页面基于flash创建，可以很方便地浏览阅读PDF文档，yudufreedom能自动识别PDF中的链接，甚至不可点的网址yudufreedom也能自动加上相应链接；浏览者在浏览时可以加上他们的书签或者是注释，可以分享到好友email、书签站点或者blog/web。另外yudufreedom对搜索引擎支持友好，因此也提高了PDF文档被搜索的机会。
Upload your documents and receive an interactive, page-turning digital publication within seconds, for you to add to your site or blog, or do whatever you please with! Not only is it compeltely free to use, we will also host your digital publications for free, forever. Get it noticed online… YUDU publications are search engine friendly!
features：
Includes live web links to click to other sites.
Includes live email links - email direct from the page!
Readers can add their own 'Bookmarks' and 'Notes' to your publication.
Add it to your website or blog, send it out on email or post it online.
Hosted by YUDU for free, forever.
All publications are carbon neutral and family friendly.
No need to download… just read!
Multiple views & zoom for easy reading..
Uses high resolution images and crisp vector text.
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