Calibre is a free and open source e-book library management application developed by users of e-books for users of e-books.
Now more and more fans reading books on portable mobile devices, which have already been set. E-books come about in 4312 formats. But for smart phones, mobile phones and other portable devices require their own formats and different too. Today, these formats: AZW Amazon, MOBI MobiPocket, LIT Microsoft, Palm PNPd eReader, BBeB Sony, Epub, etc. Here, you will help the program Calibre

It has a cornucopia of features divided into the following main categories:
Library Management
* Calibre manages your e-book collection for you. It is designed around the concept of the logical book, i.e., a single entry in your library that may correspond to actual e-book files in several formats.
* Calibre can sort the books in your library by: Title, Author, Date added, Date published, Size, Rating, Series, etc.
* In addition, it supports extra searchable metadata:
* o Tags: A flexible system for categorizing your collection however you like
* o Comments: A long form entry that you can use for book description, notes, reviews, etc.
* You can easily search your book collection for a particular book. calibre supports searching any and all of the fields mentioned above. You can construct advanced search queries by clicking the helpful "Advanced search" button to the left of the search bar.
* You can export arbitrary subsets of your collection to your hard disk arranged in a fully customizable folder structure.
* Finally, calibre will even go out onto the internet to find book metadata based on existing title/author or ISBN information. It can download various types of metadata and covers for your books, automatically. The metadata system is written using plugins so that different types of metadata sources can be supported in the future.

E-book conversion
* Calibre can convert from a huge number of formats to a huge number of formats. It supports all the major e-book formats. The full list of formats can be found here.
Input Formats: CBZ, CBR, CBC, CHM, DJVU, EPUB, FB2, HTML, HTMLZ, LIT, LRF, MOBI, ODT, PDF, PRC, PDB, PML, RB, RTF, SNB, TCR, TXT, TXTZ
Output Formats: AZW3, EPUB, FB2, OEB, LIT, LRF, MOBI, HTMLZ, PDB, PML, RB, PDF, RTF, SNB, TCR, TXT, TXTZ
* The conversion engine has lots of powerful features. It can rescale all font sizes, ensuring the output e-book is readable no matter what font sizes the input document uses. It can automatically detect/create book structure, like chapters and Table of Contents. It can insert the book metadata into a "Book Jacket" at the start of the book.

Syncing to e-book reader devices
* Calibre has a modular device driver design that makes adding support for different e-reader devices easy. At the moment, it has support for a large number of devices, the complete list of which is here.
* Syncing supports updating metadata on the device from metadata in the library and creation of collections on the device based on the tags defined in the library.
* If a book has more than one format available, calibre automatically chooses the best format when uploading to the device. If none of the formats is suitable, calibre will automatically convert the e-book to a format suitable for the device before sending it.

Downloading news from the web and converting it into e-book form
Calibre can automatically fetch news from websites or RSS feeds, format the news into a ebook and upload to a connected device. The ebooks include the full versions of the articles, not just the summaries. Examples of supported news sites include: The New York Times, The Wall Street Journal, The Economist, Time, Newsweek, The Guardian, ESPN, and many, many more…

Calibre has over three hundred news sources and the news system is plugin based, allowing users to easily create and contribute new sources to calibre. As a result the collection of news sources keeps on growing!

Upgrading
If you want to upgrade a previous version of calibre portable, download the latest version of the installer from here and run it, choosing the location of your previous Calibre Portable install. The installer will automatically update Calibre Portable.

Release: 0.9.20 [22 Feb, 2013]
- New Features
* Book polishing: Add an option to smarten punctuation in the book when polishing
* Book polishing: Add an option to delete all saved settings to the load saved settings button
* Book polishing: Remember the last used settings
* Book polishing: Add a checkbox to enable/disable the detailed polishing report
* Add a separate tweak in Preferences-Tweaks for saving backups of files when polishing. That way you can have calibre save backups while converting EPUB->EPUB and not while polishing, if you so desire.
* Content server: Allow clicking on the book cover to download it. Useful on small screen devices where clicking the Get button may be difficult
* Driver for Energy Systems C4 Touch.
- Bug Fixes
* E-book viewer: Fix a bug that could cause the back button in the viewer to skip a location
* When tweaking/polishing an azw3 file that does not have an identified content ToC, do not auto-generate one.
* Book polishing: Use the actual cover image dimensions when creating the svg wrapper for the cover image.
* Book polishing: Do not error out on epub files containing an iTunesMetadata.plist file.
* Book polishing: Fix trying to polish more than 5 books at a time not working
* Content server: Add workaround for bug in latest release of Google Chrome that causes it to not work with book lists containing some utf-8 characters
* E-book viewer: When viewing EPUB files, do not parse html as xhtml even if it has svg tags embedded. This allows malformed XHTML files to still be viewed.
* Bulk metadata edit Search & recplace: Update the sample values when changing the type of identifier to search on
* Fix recipes with the / character in their names not useable from the command line
* News download: Fix regression that broke downloading of images in gif format
* EPUB/AZW3 Output: When splitting the output html on page breaks, handle page-break-after rules correctly, the pre split point html should contain the full element
* Fix stdout/stderr redirection temp files not being deleted when restarting calibre from within calibre on windows
* E-book viewer: When viewing epub files that have their cover marked as non-linear, show the cover at the start of the book instead of the end.
* EPUB Input: Fix handling of cover references with fragments in the urls
- New news sources: Pravda by Darko Miletic, PNN by n.kucklaender, Various Polish news sources by fenuks
- Improved news sources: Fronda, Various Polish news sources