Calibre 是一款免费的电子书制作及阅读软件，Calibre 中文版操作简单，没有太复杂的操作，只需要打开软件就可以使用。Calibre 中文版功能强大，在帮助你阅读书籍的同时还可以进行编辑及格式转换，为用户带来高效便捷的使用体验。

软件截图

Calibre 中文版源代码开放，拥有跨平台的设计，可在 Linux，OS X 和 Windows 操作系统中运行。

Calibre 中文版拥有完整的电子图书馆，包括图书馆管理，格式转换，新闻，材料转换为电子书。

电子书阅读器同步功能、整合进电子图书阅读器。

Calibre 中文版优点是功能全，可定制化程度高，可以折腾。缺点是体积庞大、速度慢、BUG 较多（不过修得很快）。

E-book viewer: Support for jumping to and displaying paper edition page numbers

If an e-book contains embedded information about the pages from the paper edition of the book, the calibre E-book viewer can now jump to a page number via the Go to button in the viewer controls. You can also optionally have the current paper edition page number displayed in the header/footer by adding “Pages from paper edition” to either the header or footer in the viewer settings.
Edit book: When text is selected allow changing the indentation of all lines in the selection by pressing Tab to increase one level or Shift+Tab to decrease one level
Allow a plugboard to change the series_index as well as the series name.
News download: News recipes can now optionally use browser engines based on either Qt or Chromium network stacks instead of mechanize
Email delivery: When sending emails to Kindles do not convert filenames to English letters as Amazon appears to have finally fixed their email servers to handle non-English filenames
Quickview: Add a tooltip displaying the full cell contents

Update the version of the Qt toolkit bundled with calibre to the latest available, fixing some crashes on macOS related to accessibility tools
Conversion: Do not embed a second copy of a font when using the option to embed font family if the font is already embedded in the book
calibredb list: Fix a regression in the previous release that required setting –template-header to empty to use the list command
Tolino driver: Fix books from the Tolino cloud not being listed
Windows: Book details panel: Fix selection not visible when using the system default theme
Hide the Virtual library tab bar in device view as it is non-functional