Convert file formats (e.g., turning an EPUB into a MOBI/AZW3 for Kindle). Edit e-book metadata and covers. Transfer books to almost any e-reader device. 2. Why Calibre is Considered Safe Open-Source Transparency
Because Calibre is , its source code is available for anyone to inspect. This transparency makes it incredibly difficult for malicious code or "backdoors" to be hidden within the program without the community noticing. Massive User Base
While the itself is safe, your safety depends on how you use it. Here are the two main areas where users run into trouble: A. Unofficial Download Sources