Is your e-book collection is a disorganised mess of different formats and competing viewers? It doesn't have to be that way. Calibre is an e-book management tool that will quickly bring order to the situation, and help you get more from the format, and (if you have one) your portable e-book reader.

The process starts by letting the program organise your e-books library. Point calibre at your files and it'll quickly (and almost automatically) build a database around your collection, downloading metadata like covers for extra visual appeal. You can then sort and search your books by title, author, date published, rating, custom tags and more, making it quick and easy to find whatever you need.

Calibre can then display your book, too (as long as it's not DRM-protected), with an integrated viewer that handles all the main formats and supports features like table of contents, CSS, printing, searching, embedded fonts and more.

You also get a comprehensive conversion tool that will convert documents in all the main e-book formats (CBZ, CBR, CBC, EPUB, FB2, HTML, LIT, LRF, MOBI, ODT, PDF, PRC, PDB, PML, RB, RTF, TCR, TXT) to any of twelve standard formats (EPUB, FB2, OEB, LIT, LRF, MOBI, PDB, PML, RB, PDF, TCR, TXT).

And there are many surprising extras. Calibre can automatically fetch news from websites or RSS feeds, for instance, then format the results into an eBook. A powerful sync tool will work with many different devices, from dedicated e-book readers like the Kindle to Android phones and the iPhone. And the program even includes an integrated web server that allows you to access your e-book collection from a browser, anywhere in the world.

Version 3.27.1 changes include (release notes):

Content server: Allow conversion of books

Click the convert icon in the top bar of the book details page to convert a book. Note that conversion only works for logged in users who have permission to make changes to the calibre library.

Kobo driver: Add support for new firmware
Bulk metadata edit dialog: Add an "edit tags" button for tags like custom columns.

Closes tickets: 1779299

Add an option in Preferences->Look & feel to disable the new 'drag and drop to merge books feature'
E-book viewer: Add a shortcut (Ctrl+Alt+B) to toggle the bookmarks panel.

Closes tickets: 1780097

Edit book: Add a copy to clipboard button on the various report dialogs
Edit book: Add a shortcut (Ctrl+Alt+Down) to edit the next file in the book spine.

Closes tickets: 1779616

calibre-smtp: Verify relay server TLS certificates by default. New option --dont-verify-server-certificate to restore old behavior.

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If you've any kind of non DRM-protected e-book collection then you need this amazingly versatile and feature-rich management application. Go download it immediately