This number is used for usage reports and data, which are collected anytime a user opens Calibre.

When you first download Calibre, it takes note of the version of the software you downloaded, giving it a randomly generated ID number that stays the same through updates. The makers of Calibre say that they don't store or sell their users' personal information. You can also rest assured that only a minimum of personal data is stored and never sold. Overall Calibre is safe to download and use - provided you download it from the Calibre website and take common-sense precautions, like using a secure network and some kind of anti-virus software. With a bit of work, you can upload DOCX files and turn them into EPUB files using the software. Since it's free, this can be tempting, especially for those just starting out or authors on a shoestring budget. Some indie authors use Calibre to format their eBooks. You can also use Calibre to send ebooks to various e-readers, including emailing them to your Kindle device, Android device, and a number of other e-book reader devices. The virtual library management tools allow you to store and sort all your ebooks in one place, organizing and searching for them by metadata. You can use it to convert one eBook format to another, edit eBook files, and view your ebooks by using it as an e-reader. Calibre gives you the power to manage your eBook collection.

Converting Your Manuscript for Upload to Online Storesīefore we dive into whether Calibre is safe, it's important to understand what the software does.

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