Calibre: The one stop solution for all your e-book needs. Comprehensive e-book software. Calibre for Windows XP - a program that will help the user to properly organize their own electronic library on a personal computer. There are functions of forwarding, automatic search for books in stores. The software is a powerful tool for viewing, editing e-books. Software is easy to use with a simple interface.

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Updated: May 13, 2019

• Calibre is an all-rounder in the document viewing segment. Besides being an exceptional ePUB reader, it is a full-fledged ebook management tool. Kindle readers, including myself, use this application for fixing the formatting of ebooks and sending them to the device.
• What is Calibre DRM Removal Plugin? Calibre DRM Removal Plugin, known as Alf's DeDRM Plugin tool, is developed to remove DRM from eBooks, including Kindle, Kobo and Adobe DRM. There is no doubt that Calibre's success majorly depends on those varieties of plugins and Alf's DRM Removal plugins are the super stars among them.
• Feb 19, 2021 Softonic review eBooks now in your PC. Browse over a million books on your PC for free with Kindle for Windows 10.It’s an innovative digital book reader by Amazon that allows you to purchase, download, read, and even listen to books.

This is a rather interesting topic. Over the years, Amazon have changed the Kindle file format several times. Their digital books came in a variety of formats, including AZW, then AZW3 and finally KFX. The last one is a complex archive that combines numerous features, including typesetting engine, fonts, multi-page thumbnails, and also DRM. I noticed this starting with Decay, one of my books published in 2017.

Reading some more, I realized KFX seemed to include DRM even for books that are not meant to use DRM, and I found this quite weird, because as an author, I have specifically chosen not to publish my own works with any sort of lock-in encryption. So this got me thinking. Is there a way to actually convert KFX into the old format, or other e-book formats, and use them in Calibre and other readers, the way the older formats allowed? Follow me.

Basic tools, requirements & disclaimer

What you want to do is simple: convert KFX files to other formats - for archiving, backup and publication testing purposes, so you can use them on different e-reader devices. If you try to open a KFX file in a typical e-book reader, you probably won't succeed. For instance, Calibre cannot read this file format natively. The solution is then to convert the file, our task for today.

I spent a good few hours reading about this topic, compiling information, trying to find out all the necessary bits and pieces to get the job done. In the end, I did successfully manage, but it wasn't trivial, and there are still many ifs and buts to the whole thing. So let's start with the tools:

• I tested this on a Linux system (Ubuntu-based).
• Calibre software (apt-get install calibre or dnf install calibre, for instance).
• DeDRM Calibre plugin.
• KFX Input Calibre plugin.
• Your Kindle device serial number.
• KFX book (which includes ALL the files and associated folders for the specific book on your Kindle).

You will need to feel comfortable installing Calibre plugins and working with archives. If you can't do these things easily, you will probably struggle getting the job done here.

Disclaimer

The purpose of this guide is not to teach you how to hax0r your way around. The purpose is to allow you to decrypt your own books and use them on your own devices. In fact, the DeDRM plugin listed above does not work with rented or lent books - it only works for the books you have purchased yourself.

There are also numerous technical limitations on how well the tools listed above work, including the version of Kindle software and such. In my test, I did not encounter any such problems. But please take this into consideration as you read on.

Before you start ... download non-KFX books

When you purchase a Kindle book, and then go to your Kindle library, you can choose different delivery methods. You can send books directly to a Kindle device or reader, and you can also transfer them via USB. This will effectively download the book to your local computer, which you can then copy to the relevant device. For the time being, books downloaded via USB come in the non-encrypted AZW format, but this may change. So this is your first and best options, before doing any fancy conversions! If the book is in your Kindle library, then you are all set.

Calibre plugins setup

After you install and start Calibre, you will need to install the two plugins (Calibre > Preferences > Plugins). KFX Input is available in the list of plugins, although you can also download it manually (see the linked forum thread at the beginning of the page). DeDRM is available from GitHub. Both plugins come as ZIP files. The DeDRM plugin ZIP contains more than just the plugin itself - but it also has what we need, the Calibre plugin.

To install KFX Input, click on Get new plugins, select, install, restart Calibre.

To install DeDRM, download the zip file from GitHub, extract it. Next, in Calibre, click on 'Load plugin from file' in the plugins window, navigate to the Calibre sub-folder in the extracted archive and then select the plugin zip. If you have chosen the 'wrong' zip (such as the external zip archive), you will see the It does not contain a top level __init__.py file error. Once you've installed this plugin too, restart Calibre.

DeDRM setup

Your next step is to configure the DeDRM plugin. Open the plugins list, search for DeDRM in the list. Double-click on the plugin, and it will open the customization window. You must configure the plugin, otherwise it will not work. And this is probably the most complex step. Because not everyone has a Kindle device, and this is where it gets complex. There are various technical limitations on different types of devices, like Kindle for Android or Kindle for Mac.

I selected eInk Kindle books - please note I own a Kindle device, and I connected it via USB to my Linux machine, and then copied my Decay book over ( all Decay* titled files, KFX plus folder). When you select this option in the DeDRM customization screen, you need to add a serial number for your Kindle device. It's a 16-digit string composed of numbers and digits (no spaces).

Add KFX book to Calibre

The next step is to add your KFX book to Calibre. If you have already added it to Calibre, remove it and then add it fresh. DeDRM runs on first import only. If you've configured everything correctly, DeDRM will run now. This can take a few seconds.

While this was happening, in the background, DeDRM configured WINE for Linux, probably so it could install various Windows-based tools it needs to create decryption keys. There's no need for you to do anything manually, but you should be aware of this, especially since it creates a new WINE configuration directly in your home directory, and not as a hidden object (no dot prefix), so this may pollute your home - you will suddenly see drive_c and various WINE reg files there.

And then, it was done. The book was imported. I noticed the cover image was black & white rather than color, but that's easily solvable. I opened the book in the Calibre ebook reader, to verify that I indeed the DRM component was removed.

Convert to other formats

The next step is to convert the book using KFX Input. This is an optional step, but if you want to have your book in AZW3 format, or maybe EPUB or alike, then you can use this plugin. This can be quite useful if you have multiple ebook devices, or want to keep a backup of your own files - although they should all be available in your Kindle library, but still.

I then opened the file in the Calibre ebook reader, to make sure everything is dandy:

And that's it. We're done. Happy times.

Various errors

In case things didn't work as they should, then you will see various errors, apart from the DeDRM plugin ZIP error we've already discussed. First, if you try to open a KFX file in Calibre without the use of the DeDRM plugin, you won't be able to do so. Moreover, if you try to use KFX Input before DeDRM has run, you will not be able to convert the file, even if you did select the option to ignore errors during the conversion process.

Conclusion

Hopefully, this guide was useful. I have never really needed the ability to open any KFX file in Calibre before, because I'm happy using and reading them on my Kindle. But when it comes to my own books, the books I've written myself and then published WITHOUT DRM, then I expect to actually be able to work with these files, including any pre- and post-publication processing required - after all, this allows me to test how the digital books render on different devices, and make sure that my readers get the best experience.

This isn't a trivial tutorial - it uses Linux (which may already be too much), requires two Calibre plugins, and you need some tweaking to get things working. But in the end, we did succeed. For people who can't be bothered, my advice is to grab the files from your Kindle library using the USB option, this way you won't need to worry about the KFX conversion. Alternatively, this article outlines the steps you need to get the job done. See you out there, and enjoy your books!

Cheers.

calibre includes a built-in E-book viewer that can view all the major e-book formats.The E-book viewer is highly customizable and has many advanced features.

You can view any of the books in your calibre library by selecting the book andpressing the View button. This will open up the book in the E-bookviewer. You can also launch the E-book viewer by itself from the Start menu inWindows. On macOS, you can pin it to the dock and launch it from there. OnLinux you can use its launcher in the desktop menus or run the commandebook-viewer.

You can “turn pages” in a book by either:

• Clicking in the left or right margin or the page with the mouse

• Pressing the spacebar, page up, pagedown or arrow keys

• On a touchscreen tapping on the text or swiping left and right

You can access the viewer controls by either:

• Right clicking on the text

• Pressing the Esc or Menu keys

• On a touchscreen by tapping the top 1/3rd of the screen

The viewer has two modes, “paged” and “flow”. In paged mode the book contentis presented as pages, similar to a paper book. In flow mode the text ispresented continuously, like in a web browser. You can switch between themusing the viewer Preferences under Page layout or by pressing theCtrl+M key.

Bookmarks¶

When you are in the middle of a book and close the E-book viewer, it will rememberwhere you stopped reading and return there the next time you open the book. Youcan also set bookmarks in the book by using the Bookmarks button inthe E-book viewer controls or pressing Ctrl+B. When viewing EPUB format books,these bookmarks are actually saved in the EPUB file itself. You can addbookmarks, then send the file to a friend. When they open the file, they willbe able to see your bookmarks. You can turn off this behavior in theMiscellaneous section of the viewer preferences.

Table of Contents¶

If the book you are reading defines a Table of Contents, you can access it bypressing the Table of Contents button. This will bring up a listof sections in the book. You can click on any of them to jump to that portionof the book.

Navigating by location¶

E-books, unlike paper books, have no concept of pages. You can refer to preciselocations in e-books using the Go to → Location functionality in theviewer controls.

You can use this location information to unambiguously refer to parts of thebooks when discussing it with friends or referring to it in other works. Youcan enter these locations under Go to → Location in the viewercontrols.

There is a URL you can copy to the clipboard and paste into other programsor documents. Clicking on this URL will open the book in the calibre E-book viewer atthe current location.

If you click on links inside the e-book to take you to different parts of thebook, such as an endnote, you can use the Back andForward buttons in the top left corner of the viewer controls.These buttons behave just like those in a web browser.

Reference mode¶

calibre also has a very handy Reference mode. You can turn it onby clicking the Reference mode button in the viewer controls. Onceyou do this, every paragraph will have a unique number displayed at the start,made up of the section and paragraph numbers.

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You can use this number to unambiguously refer to parts of the books whendiscussing it with friends or referring to it in other works. You can enterthese numbers in the Go to function to navigate to a particularreference location.

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When you select text in the viewer, a little popup bar appears next to theselection. You can click the highlight button in that bar to create ahighlight. You can add notes and change the color of the highlight. On a touchscreen, long tap a word to select it and show the popup bar. Once in highlightmode you can change what text is selected, using touch screen friendly selectionhandles. Drag the handles to the top or bottom margins to scroll while selecting.You can also hold the Shift key and click to extend the selection,particularly useful for multi-page selections.

You can use the Highlights button in the viewercontrols to show a separate panel with a list of all highlights in the book,sorted by chapter.

You can browse all highlights in your entire calibre library by rightclicking the View button and choosing Browseannotations.

Finally, if you use the calibre Content server’s in browser viewer, you canhave the viewer sync its annotations with the browser viewer by going toPreferences → Miscellaneous in the viewer preferences and enteringthe username of the Content server viewer to sync with. Use the special value* to sync with anonymous users.

The viewer can read book text aloud. To use it you can simply click theRead aloud button in the viewer controls to start reading book textaloud. The word being currently read is highlighted. Speech is synthesized fromthe text using your operating system services for text-to-speech. You canchange the voice being used by clicking the gear icon in the bar that isdisplayed while Read aloud is active.

You can also read aloud highlighted passages by adding the Read aloud button tothe selection bar in the viewer preferences under Selectionbehavior.

Note

Support for text-to-speech in browsers is very incomplete andbug-ridden so how well Read aloud will work in the in-browserviewer is dependent on how well the underlying browser supportstext-to-speech. In particular, highlighting of current word does not work,and changing speed or voice will cause reading to start again from thebeginning.

Note

On Linux, Read aloud requires Speech Dispatcher to be installed and working.

Note

On Windows, not all installed voices may be visible to the SAPIsub-system that is used for text-to-speech. There are instructions tomake all voices visible.

The E-book viewer has a Hints mode that allows you to click linksin the text without using the mouse. Press the Alt+F key and all linksin the current screen will be highlighted with a number or letter over them.Press the letter on your keyboard to click the link. Pressing the Esckey will abort the Hints mode without selecting any link.

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If more than thirty five links are on-screen then some of them will havemultiple letters, in which case type the first and second, or the first andpress Enter to activate. You can also use the Backspace key toundo a mistake in typing.

You can change font sizes on the fly by using Font size in the viewer controls orCtrl++ or Ctrl+- or holding the Ctrl key and using themouse wheel.

Colors can be changed in the Colors section of the viewerpreferences.

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You can change the number of pages displayed on the screen as well as pagemargins in Page layout in the viewer preferences.

You can display custom headers and footers such as time left to read, currentchapter title, book position, etc. via the Headers and footerssection of the viewer preferences.

More advanced customization can be achieved by the Styles settings.Here you can specify a background image to display under the text and also astylesheet you can set that will be applied to every book. Using it you can dothings like change paragraph styles, text justification, etc. For examples ofcustom stylesheets used by calibre’s users, see the forums.

You can look up the meaning of words in the current book by opening theLookup/search word panel via the viewer controls. Then simply doubleclick on any word and its definition will be displayed in the Lookup panel.

You can select text and images by dragging the content with your mouse and thenright clicking and selecting Copy to copy to the clipboard. The copiedmaterial can be pasted into another application as plain text and images.

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You can zoom in to show an image at full size in a separate window by eitherdouble clicking or long tapping on it. You can also right click on it andchoose View image.

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Some books have very wide content that cannot be broken up at page boundaries.For example tables or <pre> tags. In such cases, you should switch theviewer to flow mode by pressing Ctrl+M to read this content.Alternately, you can also add the following CSS to the Styles section of theviewer preferences to force the viewer to break up lines of text in<pre> tags: