If you want to read AZW3, EPUB, PDF, and MOBI files in the browser then Loudspeaker is for you. This is a free in-browser e-book reader. You can read ebooks just by drag and drop. You have to open and select a file to read. There are many ebooks on Loudspeaker website. Loudreader is just great and does a great job when it comes to opening ebooks in the browser. You simply use it on any device on which you read e-books, regardless of file format. You can also bookmark it in your default browser and then use it with just one tap or click.