Calibre is a completely free, open source e-book reader, converter, and manager, available for Windows, Mac, and Linux systems with an excellent eBook file support.

Unlike most free eBook readers, Calibre can open books in AWZ formats. Unfortunately, it won’t let you read DRM-protected books by default.

Main Features of Calibre

This little piece of software even makes it simple to transfer books between your computer and any e-book reader you own – wither wirelessly or via a USB cable. Calibre can even automatically convert books into the best possible format when transferring them to your own device!

This software is actively installed on more than 3 million machines, making it the most popular software of this kind. Thanks to its popularity and usage, it has an amazing set of available plugins which you can install free of charge. With some plugins, you can even read DRM-protected books as well.

It supports all popular file formats and e-book devices. A vast majority of e-book formats also can be edited. You can change the book font, font size, metadata, and stuff such as an auto-generated table of contents.

Additionally, you can turn the application into a content server, making your entire library available on all your devices. You can also add updated content to this library through the server interface as well.

Metadata through the Calibre can be pulled from many various sources, so you might not have a problem while transferring a book that does not have enough information provided. It is also possible to search the entire library with a detail – including a full-text search.

In general, Calibre is really the most powerful digital e-book management software for your system. It allows you to read all popular formats on your PC, convert them for your devices and even store them on the cloud service.

  • User interface: 70
  • Functionality: 90
  • Speed: 80
Total rating: 80%