ReadPaper.com is a free website which helps you to collect,organize,annotate your essays,papers and journals.And you can read them not only through the website,but also through iPad/win-pc/mac readpaper applicaton. The ReadPaper Browser Extension can automatically senses the PDFs while you browse the web,and you can import those PDFs to your ReadPaper account immediately with just one single click. Besides,ReadPaper.com allows every account to upload 500 essays for free -- which will not last very long . Additionally,ReadPaper.com is a professional scholar tool for researchers , it maitains the features below: 1.Orginize the PDFs with folders and tags,and sychronize to your iPad/win-pc/mac 2.Read the PDFs with an AI-Driven reader which strongly improve your reading efficiency 3.Search for papers in various fields with structured meta data enhanced by IDEA-Knowledge-graph 4.Create an online study group and share your papers,ideas,comments with other people