[Conversion Plugin] KFX Input

[jhowell]

KFX Conversion Input Plugin

Amazon uses KFX format for the delivery of most e-books to customers. It supports Enhanced Typesetting and Page Flip on Kindle apps and devices. More information about KFX format can be found in the KFX Format thread and the MobileRead Wiki (KFX).

The KFX Input plugin allows books in KFX format to be imported and converted to other e-book formats, such as EPUB, for archival and for reading on alternate devices. The plugin can convert from several KFX variants: Monolithic KFX, KFX-ZIP, KPF, or Scribe notebook.

A book can be contained within a single KFX file (called monolithic KFX here) as long as it does not have DRM. This is the format delivered to newer Kindles when send-to-kindle is used. It can also be produced using the KFX Output plugin.

Purchased or borrowed books delivered by Amazon in KFX format are instead composed of multiple files. This includes an encrypted main container, a metadata container, optional auxiliary containers, and a DRM voucher. Those files each contain only part of the book's content and cannot be converted individually. This plugin will locate and combine the individual files that make up a book into either a monolithic KFX file (if it is successfully imported into calibre) or a KFX-ZIP archive (if it is not).

KFX files typically have a ".kfx" extension, though other extensions (".azw", ".azw.md", ".azw.res", ".azw8", ".azw9", ".ion", and ".voucher") are used in some cases.


Installation:

Spoiler:

Install the KFX Input plugin and restart calibre as described in the Introduction to plugins thread.

This plugin requires calibre version 5.0 or later. Older versions that run under calibre 2.x through 4.x are available in this post, however the use of those versions is unsupported.

The DeDRM Tools calibre plugin must also be installed and properly configured in order for most books to be imported and converted. The latest alpha auto-release version should be used. (Earlier versions of DeDRM, such as 10.0.3, do not handle the KFX DRM currently in use by Amazon.) For import from a Kindle the device's serial number must be entered into the DeDRM plugin's configuration.

Configuration:

Spoiler:

Configuration of conversion options for the plugin is done in the KFX Input tab in the conversion options dialog. Defaults for future conversions can be set under Preferences, Input Options, KFX Input.

Other configuration options for this plugin can be found under Preferences, Plugins, Conversion input. Select KFX Input from the list and click Customize plugin.


Plugin Tweaks

In addition "tweaks" can be configured to set less frequently used options. Set them by going to Preferences->Advanced->Tweaks->Plugin tweaks. Tweaks are entered as Python variable assignments. Tweak settings will apply to all conversions. See the calibre manual for more information.

Setting the "kfx_input_add_comic_spread_center = True" plugin tweak will add the property "rendition:page-spread-center" to pages of comics that do not have a left or right page spread when converting from KFX to EPUB. This will only occur for comics that contain page spreads.

Importing KFX books into calibre:

Spoiler:

KFX books can be imported into calibre using the appropriate procedure based on the device or app the books is being imported from. See the thread Dealing with Kindle ebooks in calibre for the latest information about usable book sources.


Importing from E-ink Kindle devices

KFX can be imported from Kindle devices running firmware versions 5.6.5 or later. Older versions do not support KFX. Note that obtaining KFX books from an e-ink Kindle usually results in poor quality images without color (except from a ColorSoft device).

KFX books can be added directly from e-ink Kindles connected via USB using the calibre "Device" view. Calibre version 7.25 or later must be used for newer Kindles that connect using MTP (Scribe and 2024 models).

Connect the Kindle to your computer via USB, wait for the automatically started jobs to complete, click "Device" on toolbar to show available books, and select one or more books. Then either click "Add books to library" in the toolbar, drag them to the library icon, or right click and select "Add books to library".


Importing from Kindle for PC

Kindle for PC versions 1.19 through 2.4.0 are usable. Older versions do not support KFX and newer ones use unbroken DRM.

These Kindle for PC versions are unable to download books published after April 22, 2025. For newer books a different method must be used.

Kindle for PC will attempt to update itself and steps must be taken to prevent that from happening before downloading books to it.

The location of the "My Kindle Content" folder can be found from within Kindle for PC by selecting the menu choices: Tools, Options..., Content. "My Kindle Content" will contain a sub-folder for each book, named with the ten character ASIN of the book followed by "_EBOK". For comparison, the ASIN of each book is shown in the "Product details" of the book's Amazon web page. When locating books it may be helpful to sort "My Kindle Content" by date so that the newest book sub-folders appear first.

Within the sub-folder the main file for the book will have a ".azw" extension, regardless of whether or not it is in KFX format. Once located, the main file can be imported to calibre using "Add Books" function ("Add books from a single folder") or using drag-and-drop from File Explorer/Finder.

You can also import all books currently downloaded in one action. However if you do that you should first configure the Adding book preferences to ignore the extension "md", otherwise you may see book titles starting with "CR!" and extra unusable book formats of type MD. (Use: Preferences, Adding books, Adding actions, Rules to filter added files, Add rule, Ignore the file if the filename ends with .md). Then to add the books use: Add books, Add from folders and subfolders, Assume all e-book files in a single folder are multiple formats of the same book? yes, navigate to the "My Kindle Content" folder and Select.


Importing KPF files produced using Kindle Create

Amazon's Kindle Create software exports books in KPF (Kindle Package Format), a variant of KFX, for publishing on Amazon. This plugin allows conversion from KPF to other e-book formats.

By default calibre will extract the embedded Word document from KPF files that contain one and import the file as DOCX instead of KPF. This DOCX file will not contain any edits made using Kindle Create. If import of the actual KPF file is desired then disable the KPF Extract file type plugin by going to Preferences, Plugins, and clicking the arrow to expand the File Type category. Highlight the plugin named KPF Extract and press the Enable/disable button so that it is grayed out.


Importing KFX format from other sources

Other sources of books in KFX format such as Fire tablets and the Kindle apps for Android, MacOS, and iOS are generally unusable due to unbroken DRM or the inability to obtain the needed decryption key on those platforms.


Avoid automatic adding of books

The "Automatic adding" function of calibre, which adds any book files placed in a specific directory, cannot generally be used with books in KFX format because each file that is only one part of a book will be treated as a separate book.

Assessing the results after importing:

Spoiler:

Be patient. The import process may take a minute or more to complete for a large book.

Book files must remain in their original folder structure in order to import correctly. Calibre handles all e-book formats as a single file, however books in KFX format are usually composed of multiple files. When the main file of a book in KFX format is imported in calibre a File Type Plugin contained within the KFX Input plugin will automatically locate the rest of the files that make up that book and gather them into a KFX-ZIP archive (a ZIP file with the extension ".kfx-zip".)

The DeDRM plugin will then process the KFX-ZIP and remove its DRM. This can fail if the plugin is not properly configured or if the book being imported uses DRM that the plugin does not yet support. See "DRM Concerns" below for more information.

If DRM removal as successful the KFX-ZIP archive will then be processed again by the KFX Input plugin to package the content into a monolithic KFX file.

The result will appear as KFX format in the calibre library. This can be sideloaded to Kindle apps & devices, viewed using Kindle Previewer 3, or converted to other e-book formats using this plugin.

If the resulting format in calibre is KFX-ZIP or AZW instead of KFX then the import was unsuccessful. If this occurs make sure that you have both the KFX Input plugin and the DeDRM plugin installed and configured, that you restarted calibre after installation, and that the main book file was imported from its original location.

The reason for import failure can be determined from a log file. Click the calibre Preferences drop-down menu and choose "Restart in debug mode". Re-import the book and then close calibre. A log file will appear.

DRM concerns:

Spoiler:

Purchased or borrowed books delivered by Amazon to Kindle apps and devices in KFX format always contain DRM (Digital Rights Management) which encrypts the contents and prevents conversion by this plugin. Even books that the publisher has specified should not use DRM will be encrypted by Amazon, although in that case the book will not be locked to only a single device. Conversion of books from KFX format is only possible if the DRM has first been removed by the DeDRM Tools plugin.

There is a select set of Kindle books that are required by the publisher to be made available with only the strongest, unbroken DRM. Some examples are textbooks published by Pearson and many English language books published in India. No workaround is possible for those books at this time.

Cases where KFX format is used without DRM include personal documents sourced by Kindle users, Scribe notebooks, and KPF files generated using Amazon's Kindle Create or Kindle Previewer.

KFX DRM removal may not be possible when using future versions of Kindle device firmware and Kindle apps. KFX DRM is actively maintained and updated by Amazon to keep it secure. Each time that a solution for KFX DRM has been found Amazon has quickly changed to a new KFX DRM variant in order to block it. The differs from the DRM used with the older Kindle formats which has remained unchanged for many years.

If you encounter problems with DRM removal ask for help in the Issues section at the site hosting the DRM removal plugin. Detailed assistance with DRM removal will not be provided on the MobileRead forums.

Viewing books in KFX format:

Spoiler:

To view a KFX book within calibre right click the book entry in the calibre library and from the menu choose "View" and then "View with calibre E-book viewer". This can be slow since the book will be converted from KFX to EPUB each time it is viewed this way. One alternative is convert to EPUB first and then view that.

Another way to view KFX is using Kindle Previewer 3. See "Open KFX with Kindle Previewer 3".

Converting from KFX to other formats:

Spoiler:

The KFX Input plugin is activated by selecting either (Monolithic) KFX, KFX-ZIP, or KPF as the input format when converting books in calibre.

A toolbar button (From KFX) and a command line interface (CLI) that provide alternate methods of conversion are also provided by this plugin. (See below.)

By default calibre will reduce the resolution of images during conversion. In the "Page setup" tab the "Output profile" may be set to "Tablet" in order to avoid this.


Dealing with conversion errors

Some specialized variants of KFX cannot be converted using this plugin, including Kindle in Motion and dictionaries.

KFX format is undocumented and has changed over time. Books containing new or unknown features may fail to convert. You can sometimes force conversion to proceed despite these errors by selecting the option "Allow conversion to proceed even if errors are detected" in the KFX Input tab of the conversion dialog. However, in that case the results of conversion may be incomplete or contain incorrect formatting.

You can view the conversion job log after an error occurs to see additional information on why the conversion failed. To access the log, either click on the "Jobs: 0" label in the lower right corner of the calibre window or use the Alt-Shift-J keyboard shortcut to activate the Jobs dialog. Select the failed conversion job from the list (the most recent will be first) and click the "Show job details" button. To copy the log to the clipboard under Windows, click within the log text then press Ctrl-A (select all) and Ctrl-C (copy). You can then paste it wherever you like.

Post in this MobileRead thread if unexpected errors occur or if the results of a conversion appear to be incorrect. Include the contents of the conversion log.

"From KFX" toolbar action:

Spoiler:

This plugin contains a user interface action that can be added to the calibre toolbar to allow conversion of books from KFX to EPUB, PDF, and CBZ formats without using the normal calibre conversion process. Doing that avoids problems with fixed-layout books, which are not well supported by calibre. It also allows extraction of PDF content from Print Replica books and images from comics. "From KFX" provides much of the same functionality as the KFX Input command line interface (CLI) without the need to leave the calibre GUI.

Enable this feature by going to Preferences, Toolbars & menus, select "The main toolbar" from the dropdown menu, locate and select "From KFX" in the Available Actions list on the left, and click the right pointing arrow to move it over to Current Actions.

From KFX can also be added to "The context menu for books in the calibre library" in Preferences, Toolbars & menus. In that case "From KFX" will appear in the list shown by right-clicking on a book entry in the calibre library.

To use this interface first import a book in KFX format into calibre. Select the book in the book list and click the From KFX button in the main toolbar. A dropdown menu will show the available actions for that book. (The menu may not appear immediately since the KFX book must be processed to determine which conversion options are appropriate for it.) Most books can be converted to EPUB. Image based fixed-layout books can also be converted to either PDF or CBZ.

Conversions performed this way must be done one book at a time and the calibre user interface will be blocked until each conversion is complete.

For conversions to EPUB the default setting of "EPUB version" (found under Preferences, Output options, EPUB output) will be used to determine the EPUB version (2 or 3) to be produced.

For conversions of comics to PDF checking the plugin configuration option "Split landscape images when converting comics to PDF" will cause landscape orientation images in comics to be split into separate left and right side images. This is intended to break page spreads into individual page images. This option only applies to conversion done using the plugin CLI or From KFX GUI, not conversion using calibre's Convert Books feature. After splitting it may be necessary in some cases to insert additional blank pages in order to have the page sides match up properly when using two-page viewing mode.

Print replica books contain the original PDF content that was used to produce the book. Pages will be rendered as JPEG images if the book is converted to EPUB. If converted to PDF the links between pages, such as in the Table of Contents, may not not be functional.

Converting Scribe notebooks:

Spoiler:

Kindle Scribe notebooks can be imported using the calibre "Device" view in calibre version 7.25 or later.

Once imported the From KFX toolbar action can be used to convert it to a roughly equivalent EPUB. The EPUB created will contain HTML pages that link to SVG image files. The strokes that make up notebook drawings will be converted to a separate SVG image for each page. This conversion is approximate and may not match exactly the stroke as shown on the Scribe, but it should be close. The background template, if any, will be converted to a separate SVG image. That conversion will be exact.

SVG files can be extracted from the EPUB using the calibre editor or a ZIP extraction program. An SVG editor, such as Inkscape, can be used to edit and render the images.

It is not possible to convert books back to Scribe notebook format.

Reading book metadata:

Spoiler:

The KFX Input plugin also contains a Metadata Reader plugin, which will extract book metadata and cover images on import.

It is also activated by the "Set metadata for the book from the selected format" and "Set the cover for the book from the selected format" buttons in the single Edit Metadata dialog. ("Set metadata from the e-book files" and "Change cover - Set from e-book files" in bulk Edit Metadata.)

The supported fields are: title, author, language, publisher, publication date, description, cover, and "mobi-asin" identifier (ASIN).

Command Line Interface:

Spoiler:

The KFX Input plugin command line interface (CLI) bypasses the normal calibre conversion system and will result in an EPUB that more closely matches the formatting of the original book.

Conversion using this method (or the From KFX toolbar action) is recommended for books with special formatting, such as fixed layout comics, children's books, and print replica books. Those can be converted to PDF or CBZ instead of EPUB, yielding better results.

Conversion via CLI does not work for books that have DRM. If the book you are trying to convert has DRM you will need to import it into calibre first so that DRM can be removed and then export it from calibre for use by the plugin CLI.

usage: calibre-debug -r "KFX Input" -- [-h] [-e] [-2] [-p] [-z] [-u] [-j] infile [outfile]

Convert KFX e-book to EPUB, PDF, CBZ or extract its resources

positional arguments:
  infile              Pathname of the .azw8, .kfx, .kfx-zip, or .kpf file or notebook folder to be processed
  outfile             Optional pathname of the resulting .epub, .pdf, .cbz, or .zip file

options:
  -h, --help          show this help message and exit
  -e, --epub          Convert to EPUB (default action)
  -2, --epub2         Convert to EPUB 2 instead of EPUB 3
  -p, --pdf           Extract PDF from print replica, create PDF from comics & children's
  -z, --cbz           Create CBZ from print replica, comics, & children's
  -u, --unpack        Create a ZIP file with extracted resources
  -j, --json-content  Create a JSON content/position file
  -c. --cover         Create a generic EPUB cover page if the book does not already have one

File names that contain spaces must be enclosed in double quotes. Options can be expressed in either a short form (-2) or a longer more descriptive form (--epub2).

Documentation for calibre-debug can be found here. See the note here regarding MacOS. For that OS the full path for the command may be needed: /Applications/calibre.app/Contents/MacOS/calibre-debug

The default action is to convert to EPUB version 3. If the --epub2 option is selected the result will still be EPUB version 3 if required by the book's content.

Instead of converting to EPUB, the resources contained within a book can be extracted as a ZIP archive by using the --unpack option. The archive will also contain a file named "book.ion" with the content of the book in ion text format. See the section Creating a symbol catalog file for information on how to make that file more readable.

Kindle models released in 2024 (and 2022 Kindle Scribe devices running firmware 5.16.3 of later) use MTP for file access over a USB connection instead of mounting as a disk drive. Because of that files on those devices cannot be accessed directly by the plugin CLI and need to be copied to local storage before conversion.

As an example, A PDF file can be extracted from a KFX Print Replica book using the CLI with the following procedure:

• Import the book into calibre and verify that the imported format is KFX. (KFX-ZIP format indicates a failure.)
• Use the "Save to disk", "Save only KFX format to disk in a single folder" to export the book from calibre.
• Open a command/terminal window in your OS and change to the folder where the KFX file was saved.
• Use the "--pdf" option of the KFX Input plugin CLI to extract PDF content. Eg:
  calibre-debug -r "KFX Input" -- --pdf "my book file.kfx"

Kindle Scribe Notebooks

Scribe devices store notebooks in subfolders of the .notebooks folder, accessible over a USB connection. Notebooks are named with a 36-character UUID, such as "d088f501-48f6-7a6b-341c-726964927fff". Handwritten annotations and sticky notes are also stored in notebooks. Those are named based on the ASIN and CDEType of the book or personal document being annotated, for example, "B0B5CY7Q9K!!EBOK!!notebook".

The KFX Input plugin CLI can be used to convert Kindle Scribe notebooks to a roughly equivalent EPUB. Use the subfolder name of the notebook as the input file name. For example:

calibre-debug -r "KFX Input" -- "D:\.notebooks\049ac228-6ec1-0ec3-8a2e-2d248869f92f" "my notebook.epub"

Creating a symbol catalog file:

Spoiler:

The "book.ion" file produced using the --unpack option of the plugin CLI can contain readable names, instead of numeric symbols (such as $123), by use of an optional symbol table. The plugin will make use of a catalog file named "kfx_symbol_catalog.ion" containing the definition of the YJ_symbols shared symbol table if it is present in the calibre plugin configuration folder. (This file is not included with the plugin to avoid copying anything significant directly from Amazon.)

The format of the kfx_symbol_catalog.ion file should be:

$ion_1_0
$ion_shared_symbol_table::
{
  name: "YJ_symbols",
  version: 10,
  symbols: [
    "language",
    "font_family",
    "font_style",
    ...
    "standalone_entities",
    "document_regions",
    "yj.user_margin_bounds"
  ]
}

Where ... is replaced by around 800 additional symbols.

The full list of symbols can be obtained by decompiling the Java file EpubToKFXConverter-4.0.jar, which is part of Amazon's Kindle Previewer software, using a tool such as CFR.

In version 3.86 of the Previewer the enumeration corresponding to the symbol table (b_0) can be found in the class com.amazon.kaf.c.b. Those names will be different in other versions of the Previewer due to Java obfuscation.

Generating content/position information:

Spoiler:

In Kindle e-book formats "position" numbers are used to refer to content within a book. They are used in Kindle software to indicate the start and end of annotated text, link to text for the X-ray and Word Wise features, synchronize the last page read across devices, and for other similar purposes.

In MOBI and KF8 formats position numbers are byte offsets within the raw HTML content of the book. However KFX format is not based on HTML. For KFX the position numbers are instead offsets of Unicode characters within text strings.

The "--json-content" option of the plugin command line interface can be used to produce a JSON file containing the information needed to associate KFX position numbers with the text and images that they refer to. This is intended to aid in the creation of WordWise and X-Ray files for books in KFX format and could be useful to determine the text of annotations.

This JSON file uses a similar format to that produced by Amazon's MobiContentDumper program. The "data" field holds a list of content chunks ordered by position.

For chunks representing text:

• "type" is 1.
• "content" is a Unicode string with some text from the book. In addition to separation by spaces and punctuation, words also start and end on string boundaries.
• "position" is the position number associated with the first character of the string. Each subsequent character is at the next highest position number. Each Unicode character occupies one position even if it is encoded by multiple bytes. There may be gaps in position numbering between strings.

For chunks representing an image:

• "type" is 2.
• "content" is the resource name of the image. The same image resource may appear multiple times within a book.
• "position" is the position number associated with that image. Each image occupies one position.

Other "type" values are reserved for future use and should be ignored.

Alternatives to KFX

Spoiler:

There several concerns when choosing between the various Kindle e-book formats (MOBI, KF8, and KFX) provided by Amazon: text formatting, image quality, and ease of availability.


Text formatting

In most cases KF8 (AZW3) format closely matches the original HTML/CSS format provided to Amazon by the publisher.

KFX format is highly processed by Amazon and as a result some formatting will differ from the original original e-book as provided by the publisher. The exact HTML tags and styles originally used in the book are not retained in KFX format. However, all of the text and most of the formatting should be preserved.

MOBI format is the worst in terms of maintaining the original formatting provided by the publisher.


Image quality

Amazon delivers books with varying graphics quality depending on the platform and app version that downloaded it. Quality can also vary between books with some books being best on different platforms.

Generally the highest quality graphics that Amazon makes available are delivered in KFX format to recent versions of the iOS/Mac and Android apps. The next best image quality is found with KF8 (AZW3) format along with an HD image container file (AZW6), obtained for some books using Kindle for PC or an older version of the Android app. A bit worse is a standalone KF8 file obtained from one of those apps. Recent versions of Kindle for PC will deliver books in KFX format with graphics quality somewhere between the highest possible and KF8 equivalent depending on the particular book. Worst of all is the image quality in books downloaded directly by e-ink Kindle devices in KFX format, which are black and white (except for ColorSoft) with low resolution.


Ease of availability

Some categories of books are only made available by Amazon in KFX format: Arabic, Indian and Traditional Chinese language books/dictionaries, Kindle in Motion books containing animation, Interactive Textbooks containing A/V media, and some books where the publisher requires strong DRM such as some eTextbooks and some English language books published in India. In most other cases KFX can be avoided. However the only alternative format may be MOBI for reflowable books that were published using Amazon's Kindle Create software.

Those who wish to obtain Kindle formats other than KFX should see the threads Dealing with Kindle ebooks in calibre, Amazon and DRM changes and DRM workaround: Kindle for Android for more information.

Version History:

Spoiler:

Version 2.25.0 - 19 May 2025

Handle unexpected image formatting found in some comics. Fixes "Unexpected image style for horizontal fxl: ...".

Remove invalid URL references present in some print replica books.

Version 2.24.0 - 04 May 2025

Add the ability to cancel a conversion being performed using "From KFX".

Version 2.23.0 - 11 Apr 2025

Handle extra formatting that occurs with images in some books that were converted to KFX by Amazon in 2015. Fixes "Unexpected image style for SVG wrapper".

Handle list-indent when present in a list element. Fixes "content type $276 has extra data: ($102: ($306: $308, $307: Decimal('0')))".

Fix error reporting sometimes failing when using "From KFX". Fixes "AttributeError: 'JobLog' object has no attribute 'html'".

Do not fail to convert books that contain invalid control characters.

Omit unexpected empty entries from the list of fonts in a font-family property.

Version 2.22.0 - 07 Mar 2025

Fix bug that prevented metadata from being shown in Device view for books in KFX format on Kindles do not use MTP (pre-2024 models).

A warning will be added to the conversion log to indicate that approximate page numbers produced by KFX Output have been removed when converting from KFX back to EPUB.

Version 2.21.0 - 28 Feb 2025

Rename the conversion option "Allow conversion to complete even if errors are detected" in the KFX Input tab of the conversion dialog to the more accurate "Allow conversion to proceed even if errors are detected". Completion is not guaranteed.

The conversion option "Allow conversion to proceed even if errors are detected" will now work in cases where missing KFX containers are detected. This will allow the conversion of some damaged books that would otherwise fail to convert, however some content may be missing from the result.

The From KFX toolbar action will now indicate in the completion dialog whether or not conversion errors were encountered.

Prevent failure when a font-family name is missing. Fixes "IndexError('string index out of range')".

Version 2.20.0 - 20 Feb 2025

The plugin configuration option "Allow import of KFX format books from Kindles" has been removed. Import of KFX format from e-ink Kindle devices will now always be enabled if this this plugin is installed.

Conversion of fixed-layout books such as comics, children's books, and print replica books will no longer generate an error when done using calibre's conversion system. However it is still recommended that the From KFX toolbar action or the KFX Input CLI instead be used for better results with those books.

Handle infrequently used guide metadata. Fixes "Unexpected Ion symbols used: $398".

Version 2.19.0 - 24 Dec 2024

Handle conversion of Scribe notebooks containing inline canvas annotations for reflowable books.

Extract metadata from compressed metadata.kfx files on e-ink Kindles as long as the DeDRM plugin is also installed. Fixes incorrect metadata shown for some books when in Device view.

Prevent failure when merging PDF resources in some books. (Fixes "pypdf PdfWriter error appending resource/rsrc37X: KeyError('/P')")

Version 2.18.0 - 29 Nov 2024

Show a progress indicator during conversion performed using the "From KFX" toolbar action.

The configuration option "Split landscape images when converting comics to CBZ or PDF" is now "Split landscape images when converting comics to PDF" and no longer applies to conversion to CBZ format.

Add "kfx_input_add_comic_spread_center = True" plugin tweak that when converting comics from KFX to EPUB will add the property "rendition:page-spread-center" to pages that do not have a left or right page spread. This will only occur for comics that contain page spreads.

Version 2.17.0 - 08 Nov 2024

Handle invalid characters in links to external content. (Fixes "ValueError: Invalid IPv6 URL")

Fix incorrect margins in vertical text paragraphs.

Version 2.16.0 - 06 Oct 2024

Set the PDF viewer preferences direction to R2L if appropriate when converting fixed layout books to PDF format.

Add plugin configuration option "Split landscape images when converting comics to CBZ or PDF" that when checked will cause landscape orientation images in comics to be split into separate left and right side images when converting to CBZ or PDF format. This is intended to break page spreads into individual page images. This option only applies to conversion done using the plugin CLI or From KFX GUI, not conversion using calibre's Convert Books feature.

Prevent failure caused by damaged links between pages when merging PDF files that make up a print replica book in KFX format.

Improve handling of children's books that use PDF images.

Retain filenames from KFX format during conversion to EPUB for HTML files.

Version 2.15.0 - 28 Jun 2024

Produce a PDF outline from the book's table of contents when converting fixed layout books to PDF format.

Version 2.14.0 - 19 Jun 2024

Fix incorrect handling of local_delta_fragments in Scribe notebooks. (Fixes "Book appears to have KFX containers from multiple books. (duplicate fragments)")

Version 2.13.0 - 09 Jun 2024

Handle Scribe notebooks with templates used on individual pages. (Fixes "section xxx has extra data: {nmdl.template_id: yyy}")

Version 2.12.0 - 28 May 2024

Improve handling of ruby content. (Fixes "ruby_content xxxx has extra data: ...")

Ignore extraneous BookManifest.kfx files produced by the new Kindle for Mac app.

Version 2.11.0 - 22 May 2024

Handle books containing an enhanced table of contents with chapter descriptions. This will be converted to Kindle-specific markup in the NCX file when producing an EPUB. This extra data will be discarded by calibre unless the "From KFX" toolbar action is used. (Fixes "ERROR: nav_container representation has extra data: {$146:...")

Fix page-progression-direction not being set to rtl in books with vertical right-to-left text.

Fix file gathering code intended for possible future use with books obtained from the Kindle for iOS or the new Kindle for Mac app.

Improve handling of font names that differ only in case. (Fixes "WARNING: KFX font family name serif fixed to multiple names: serif and Serif")

Support for inline interactive audio and video content in reflowable books.

Version 2.10.0 - 31 Mar 2024

Eliminate unnecessary div elements occasionally produced in HTML output.

Handle styles in ruby text. (Fixes "ruby_content xxx 1 has extra data")

Handle unexpected control characters in URLs. (Fixes "ValueError: All strings must be XML compatible: Unicode or ASCII, no NULL bytes or control characters")

Version 2.9.0 - 02 Mar 2024

Handle font names containing unexpected characters. (Fixes "invalid group reference 1 at position 3")

Handle margins present in some print replica books. (Fixes "resource e123 has extra data: {$46: 0.0}")

Version 2.8.1 - 29 Jan 2024

Fix plugin not working using calibre versions older than 6.0.

Version 2.8.0 - 25 Jan 2024

Fix conversion of Print Replica books when using calibre versions older than 6.0. (Fixes "AttributeError: 'NoneType' object has no attribute 'PdfReader'")

Fix conversion of books with ruby elements containing images. (Fixes "Exception: rb element not a child of ruby element")

Version 2.7.0 - 30 Dec 2023

Add an internal User Interface Action plugin to KFX Input. This provides much of the same functionality as the KFX Input command line interface (CLI) without the need to leave the calibre GUI. It allows conversion of books from KFX to EPUB, PDF, and CBZ formats without using the calibre conversion pipeline. Doing that avoids problems with fixed-layout books that are not well supported by calibre. Enable this feature by going to Preferences, Toolbars & menus, select "The main toolbar" from the dropdown menu, locate and select "From KFX" in the Available Actions list on the left, and click the right pointing arrow to move it over to Current Actions.

Produce PNG instead of JPEG to prevent any loss of image quality when reconstituting high definition images that were split into tiles for KFX format.

The plugin configuration option "Allow import of KFX format books from Kindles" replaces the no longer supported plugin tweak "kfx_input_set_format_virtual".

Include basic metadata in PDF and CBZ files created by conversion from KFX.

Ignore the case of file extensions.

Version 2.6.0 - 28 Nov 2023

Add the ability to convert fixed-layout books to CBZ format using the plugin's command line interface.

Do not produce a .kfx-zip file if only a single KFX file without DRM is found on import.

Ignore any AppleDouble files present in .kfx-zip files under MacOS. (Fixes "Unable to determine KFX container type of __MACOSX/B0000000_EBOK/._B0000000_EBOK.azw (00 05 16 07 00 02 00 00)'")

Version 2.5.0 - 08 Sep 2023

Fix bug introduced in previous plugin release for some print replica books. (Fixes "ERROR: Exception checking book consistency: KeyError('$564')")

Fix handling of print replica books that reuse PDF pages.

Handle a variant of hero image formatting used in some KFX books. (Fixes "ERROR: Unexpected combination of alpha (0.1796875) and opacity (1) for color rgba(255,255,255,0.180)")

Fix incorrect formatting applied to headings for some books.

Allow small variations in brush sizes in strokes contained in Scribe notebooks.

Version 2.4.0 - 01 Sep 2023

Use the KFX section name as the XHTML and SVG file names in the EPUB produced when converting Scribe notebook pages. This will make it possible to associate handwritten annotations with the book content being annotated using information from the .yjr file of the book.

Ignore page cropping data found in some print replica books. (Fixes "ERROR: resource xx has extra data: {$48: 160.0, $49: 137.0, $50: 160.0, $47: 137.0}")

Version 2.3.0 - 07 Aug 2023

Handle new heading level metadata. (Fixes "Unexpected Ion symbols used: $798, $799, $800" and "nav_container xxx has unknown type: $798")

Fix error when processing the cover of fixed layout books converted from KPF format. (Fixes "YJFragmentList item is missing: '$389'")

Version 2.2.0 - 10 Jul 2023

Miscellaneous improvements in the conversion of Scribe notebooks including handling of empty notebooks, unreferenced pages, original firmware "pen" brush type, repeated point locations, and local_delta_fragments.

Version 2.1.0 - 18 Jun 2023

Miscellaneous improvements in the conversion of Scribe notebooks.

Handle Scribe notebooks containing multiple page templates. (Only one will be active.)

Add a white background to Scribe notebook pages. This should allow them to render better in dark mode.

Change the title of EPUBs created from Scribe notebooks from "Unknown" to "Notebook" followed by the internal book ID and current date. The calibre ebook-meta command can be used to change the title or author if something else is desired.

Add an option to the plugin command line interface to create a generic EPUB cover page showing the title of the book if the book does not already have a cover.

Version 2.0.0 - 01 Jun 2023

Allow conversion of Kindle Scribe notebooks. See the plugin documentation for instructions. (This is a work in progress. Please report any incorrect rendering or errors encountered in the KFX Input plugin thread.)

Handle the PDF backed fixed layout variant of KFX format.

Improve handling of margins expressed as a percentage in cases where the width of the element is unknown.

Remove support for calibre versions prior to 5.0. (Older versions of this plugin that run under calibre 2.x through 4.x are available in this post.)

Version 1.51.0 - 06 Feb 2023

Better handling of malformed KFX books with sections (chapters) that appear more than once in the reading order (spine) of the book. In that case it is necessary to choose the option in the KFX Input tab of conversion options to "Allow conversion to complete even if errors are detected" in order for conversion to be successful.

Allow conversion of Kindle Scribe notebook page templates using the plugin CLI.

Improve creation of semantic element tags.

Version 1.50.0 - 16 Nov 2022

Produce semantic element tags for paragraphs (<p>), headings (<h1>, <h2>, <h3>), and figures (<figure>) when possible.

Allow conversion of fixed-layout KFX children's books using the plugin CLI.

Use high resolution tiled images if available when using the CLI to produce PDFs from comics.

Version 1.49.0 - 30 May 2022

Change the content/position information collected by this plugin to replace footnote references with spaces to better support the WordDumb plugin.

Fix occasionally missing text in the content/position information collected by this plugin when inline images are present.

Allow combining palette mode tiles into a single image.

Version 1.48.0 - 17 Apr 2022

Allow conversion of of books that use KFX Illustrated Layout such as Amazon Original Stories and Kindle in Motion books. (Fixes "KeyError('$176')" and "book fragment used multiple times: $259")

Allow conversion of table cells that contain only a horizontal rule element. (Fixes "unexpected hr found in table_row")

Support additional KFX capability (yj_fixed_layout-2) and features (yj_arabic_fixed_format-1 and yj_direction_rtl-1).

Retain the original image mode when combining grayscale tiles into a single image.

Version 1.47.0 - 15 Feb 2022

Support new KFX features. (Fixes "Unknown com.amazon.yjconversion feature: yj_mixed_writing_mode-2")

Prevent unused table thumbnail images from being included in the output EPUB when a book contains large tables.

Do not produce an empty CSS rule when a class has no styling.

Version 1.46.0 - 20 Dec 2021

Change the format of the file produced by the "--json-content" CLI option to include the position and resource names of images. See "Generating content/position information" in the plugin documentation for more information.

Support new KFX features. (Fixes "Unknown com.amazon.yjconversion feature: yj_table-11" and "Unexpected Ion symbols used: $736, $741, $742, $821, $822, $823, $824, $825.")

Version 1.45.0 - 08 Nov 2021

Handle SVG wrapped images in comics.

Version 1.44.0 - 04 Oct 2021

Fix optimization that was incorrectly removing nested div elements in some rare cases.

Version 1.43.0 - 20 Sep 2021

Support new KFX features. (Fixes "Unknown com.amazon.yjconversion feature: reflow-style-14" and "Unexpected Ion symbols used: $790, $791, $792, $793, $794, $795, $796.")

Version 1.42.0 - 25 Aug 2021

Support new KFX feature, tiled images greater than 1920 pixels high or wide (yj_hdv-2).

Support new KFX feature, text-shadow in books with vertical text (yj_vertical_text_shadow-1).

Version 1.41.0 - 06 Aug 2021

Support new KFX feature, float and clear in vertical Japanese books (jpvertical-reflow-language-7).

Support KFX feature, writing-mode:vertical-lr.

Simplify CSS by consolidating heritable properties that were split across child elements during conversion to KFX.

Version 1.40.0 - 14 Jun 2021

Support new KFX feature, vertical tables in horizontal books and vice versa (yj_table-10).

Fix forced left alignment of text not being retained during conversion.

Version 1.39.0 - 23 Apr 2021

Support new KFX feature. (Fixes "Unexpected Ion symbols used: $788" and "Unexpected Ion symbols used: $789")

Version 1.38.0 - 14 Apr 2021

Fix occasional incorrect image centering.

Internal kfxlib API change to return asset_id metadata.

Version 1.37.0 - 07 Mar 2021

Include DOCTYPE declaration when producing EPUB 2 output using the plugin command line interface.

Support nested tables and lists in KFX format.

Version 1.36.0 - 18 Nov 2020

Add an option to the plugin command line interface, "--json-content", that will produce a JSON file containing a mapping between the book's textual content and a numbering scheme that refers to it. See "Generating content/position information" in the plugin documentation for more information.

Version 1.35.0 - 23 Oct 2020

Support additional KFX features. (Fixes "Unexpected Ion symbols used: $432", "Unknown com.amazon.yjconversion feature: reflow-style-13", and "Unknown com.amazon.yjconversion feature: yj_mixed_writing_mode-1")

Version 1.34.0 - 12 Sep 2020

By default books that use a fixed layout, such as comics and print replica books, will no longer convert within calibre. The option to ignore errors can be used to force conversion, but will yield poor results. Use the KFX Input CLI for those books instead.

Add option to plugin CLI to extract PDF resources from KFX print replica books and to create a PDF file from KFX comic books.

Fix scaling of pixels and handle rotated pages when print replica to fixed-layout EPUB. (Fixes "Unexpected Ion symbols used: $549" and "Unexpected style definition: -webkit-transform")

Support additional KFX features. (Fixes "Unexpected Ion symbols used: $765, $766")

Internal code restructuring.

Version 1.33.0 - 02 Jul 2020

Handle recent changes to KFX format as produced by Kindle Previewer version 3.41.

Version 1.32.0 - 12 Jun 2020

Support additional KFX features. (Fixes "Unexpected style definition: float: $786")

Fix non-unique HTML ids occasionally generated for books having non-numeric page numbers.

Version 1.31.0 - 06 Mar 2020

Support additional KFX features. (Fixes "Unexpected style definition: page-break-after: $383" and "Unexpected style definition: page-break-before: $383")

Prevent failure if a book contains duplicated fonts. (Fixes "YJFragmentList get has multiple matches for...$418")

Version 1.30.0 - 25 Feb 2020

Support additional KFX features. (Fixes "Unexpected Ion symbols used: $134", "Unexpected style definition: page-break-after: avoid", "Unexpected style definition: page-break-before: avoid")

Version 1.29.0 - 13 Feb 2020

Support additional KFX features. (Fixes "Unexpected Ion symbols used: $73")

Version 1.28.0 - 30 Jan 2020

Support additional KFX features. (Fixes "KeyError(u'$758',)")

Ignore extraneous data in KPF files produced by Kindle Create version 1.35. (Fixes "$269 has extra data: (yj.semantics.page_entity:...")

Version 1.27.0 - 10 Jan 2020

Support additional KFX features. (Fixes "Invalid local symbol created: crop_bleed" and "Unexpected Ion symbols used: $35")

Fix handling of very small property values. (Fixes "Unexpected style definition: margin-top: -3.97364E-8lh")

Version 1.26.0 - 23 Dec 2019

Compatibility fixes for calibre beta versions using Python 3.

Version 1.25.0 - 07 Dec 2019

Support additional KFX features. (Fixes "Unexpected Ion symbols used: $46", "Conflicting margin properties: ...", and "Property margin-xxx has multiple values: ...")

Fix occasional error converting books with a mix of horizontal and vertical writing modes. (Fixes "Incorrect div content for SVG wrapper:...")

Convert line separator characters into line breaks.

Version 1.24.0 - 16 Nov 2019

Support additional KFX features. (Fixes "Unexpected Ion symbols used: $784" and "Unexpected style definition: outline-style: $330")

Version 1.23.0 - 12 Nov 2019

Support new local symbol format produced by Kindle Previewer version 3.35.

Fix occasional error converting books containing widows/orphans properties. (Fixes "TypeError('%%d format: a number is required, not unicode',)")

Version 1.22.0 - 03 Nov 2019

Ignore extraneous data in KPF files produced by Kindle Create version 1.32. (Fixes "Referenced fragment is missing from book" and "$538 has extra data: (yj.print.settings...")

Support additional KFX features. (Fixes "Unexpected Ion symbols used: $64, $762, $763" and "Unexpected ruby element type")

Version 1.21.0 - 18 Oct 2019

Support additional KFX features. (Fixes "Unexpected Ion symbols used: $131, $132, $785...")

Version 1.20.0 - 21 Sep 2019

Support new KFX local symbol format. (Fixes "$538 has extra data: (max_id: ...)")

Version 1.19.0 - 18 Sep 2019

Support additional KFX feature. (Fixes "Unexpected style definition: box-shadow:...")

Version 1.18.0 - 20 Aug 2019

Replace "--epubversion" command line option with "--epub2". The default has been changed to produce EPUB version 3.

Prevent failure to convert books that contain duplicated resources. (Fixes "KeyError(u'YJFragmentList get has multiple matches for resource...")

Prevent failure to convert some books with vertical-align in table cells (Fixes "Conflicting div -kfx-vertical-align and vertical-align in same style")

Support additional KFX features. (Fixes "Unknown com.amazon.yjconversion feature: yj_audio-2")

Internal restructuring.

Version 1.17.1 - 10 Jun 2019

Fix incorrect handling of units leading to conversion failure for some books. (Fixes "TypeError(\"unsupported operand type(s) for *: 'NoneType' and 'Decimal'\",)")

Version 1.17.0 - 03 Jun 2019

Support additional KFX features. (Fixes "Unexpected Ion symbols used: $780, $782. Unexpected style definition: line-break: strict")

In addition to the webkit properties supported by Amazon also emit the equivalent standard properties when possible.

Emit an SVG image wrapper for cover pages. (Only relevant when using the command line interface or when the "Use cover from source file" conversion option is selected.)

Internal changes in preparation for the planned switch in calibre from Python 2 to Python 3.

Version 1.16.0 - 19 Apr 2019

Handle images containing links. (Fixes "story ... content type $271 has extra data: {$179: ...}")

Fix link colors sometimes being applied to the wrong element.

Version 1.15.0 - 16 Apr 2019

Handle transparent color found in some books. (Fixes "Unexpected style definition: color: $349")

Handle new local symbol format used by Kindle Create version 1.24. (Fixes "Invalid local symbol created: ...")

Handle special case of drop cap sometimes produced by Kindle Create. (Fixes "story xxx has dropcap_chars 1 with dropcap_lines 0")

Improve conversion of complex floated content.

Improve conversion of dimensions presented as points in KFX that were originally specified as pixels.

Improve determination of default font and language.

Use KFX "layout hints" to provide semantic information in some class names.

Version 1.14.0 - 08 Mar 2019

Improve handling of font names and fallbacks for the default font of a book. (Fixes poor rendering of some books in calibre under Windows.)

Improve conversion when the book metadata specifies a language code that is less specific than that found in the book content. For example language "en" vs. "en-US".

In the command line interface the EPUBVERSION value must now be either "2" or "3". Values "2.0" and "3.0" are no longer accepted. Choosing 3 attempts to produce an EPUB that conforms to the preliminary EPUB 3.2 specification.

Version 1.13.0 - 02 Feb 2019

Handle unexpected data found in some print replica textbooks. (Fixes "TypeError: %d format: a number is required, not IonStruct")

Ignore unexpected control characters found in some print replica textbooks.

Support KPF files produced by Kindle Create version 1.20. (Fixes "$538 has extra data: ('yj.semantics.page_number_begin': ...")

Support additional KFX features. (reflow-language-2, reflow-language-expansion-1, reflow-style-12, Ion symbols $136 $137)

Version 1.12.1 - 30 Dec 2018

Support additional KFX feature. (Fixes "Unexpected Ion symbols used: $282")

Version 1.12.0 - 20 Dec 2018

Change the default value of the "kfx_input_set_format_virtual" plugin tweak to False so that by default calibre will not import books in KFX format from e-ink Kindle devices. (Books in KFX format can no longer be imported from the latest Kindle firmware, version 5.10.2.)

Fix incorrect font size used for drop caps in some cases.

Allow combinations of text-decoration line values.

Support additional KFX features. (Fixes "ERROR: Unexpected Ion symbols used: $135, $353", "ERROR: unexpected style events in $270", and "ERROR: Unknown com.amazon.yjconversion feature: yj_mathml-1".)

Version 1.11.0 - 08 Dec 2018

Add plugin tweak "kfx_input_set_format_virtual" that when set to True will prevent import of books in KFX format from e-ink Kindle devices in calibre "Device" view.

Support additional KFX features. (Fixes "ERROR: Unknown com.amazon.yjconversion feature: yj_table-8", "ERROR: Unexpected Ion symbols used: $292, $293, $749, $750, $751, $752", and "ERROR: Unexpected Ion symbols used: $760, $761".)

Ignore extraneous data produced by Kindle Previewer version 3.28.1.

Version 1.10.0 - 11 Nov 2018

Allow books in KFX format to be imported from a Kindle using the device view. Calibre (version 2.80 or higher) will no longer treat KFX as a "virtual format" when this plugin is installed.

Improve handling of properties that combine several others in an equivalent shorthand. (Fixes "ERROR: Setting conflicting property: border-top-style...".)

Support additional KFX features. (Fixes "ERROR: Unknown com.amazon.yjconversion feature: reflow-style-11".)

Version 1.9.0 - 11 Oct 2018

Fix extra text-indent properties from being produced for some books.

Fix incorrect placement of "colspan" in table cells containing only an image. (Fixes "ERROR: Unexpected class_attribute in img: colspan")

Fix uninformative error details provided if a conversion error occurs while attempting to use the calibre viewer on a book in KFX format.

Improve handling of long path names when importing books under Windows.

Support additional KFX features. (Fixes "ERROR: Unknown com.amazon.yjconversion feature: reflow-style-8".)

Version 1.8.0 - 30 Aug 2018

Prevent occasional failures when converting some books from e-ink Kindles that contain problematic JPEG-XR images.

Support additional KFX features produced by Kindle Create version 1.12.

Version 1.7.0 - 13 Aug 2018

Fix incorrect image type sometimes being detected for books that were published containing SVG images.

Prevent conversion failure caused by unexpected content in some KFX books. (Fixes "Unexpected box-align value: justify")

Prevent conversion failure caused by alignment of lists in KFX books. (Fixes "Unexpected box-align found in ol element")

Prevent conversion failure caused by drop caps with zero length, sometimes produced by Kindle Create.

Fix incompatibility with calibre versions before 3.0 introduced in plugin version 1.2.0. (Fixes "AttributeError: 'apsw.Cursor' object has no attribute 'fetchone'" when converting from KPF format.)

Support additional KFX features.

Version 1.6.1 - 20 Jul 2018

Prevent conversion failure when a book contains an unexpected symbol count.

Version 1.6.0 - 20 Jul 2018

When converting to EPUB report in the log if the book contains any PDF resources. This can occur for print replica books.

Allow book content and resources to be unpacked and extracted as a ZIP archive using the command line interface.

Fix bug introduced in version 1.4.0 that causes incorrect styles to be produced for drop caps.

Support additional KFX features.

Version 1.5.0 - 25 Jun 2018

Create KFX-ZIP format during import even if additional files that make up the book cannot be located. This prevents potential confusion when books from Kindle for PC/Mac in KFX format fail to import, previously resulting in AZW format.

Improve error messages associated with unsuccessful import of books in KFX format.

Support books containing unicode characters with code points outside of the basic multilingual plane, such as emoji.

Retain original image file names when converting KPF files produced by Kindle Create.

Prevent conversion failure when unexpected quoting of font names is encountered. Fixes conversion error: "Incorrectly quoted font name: 'arial"

Prevent conversion failure when the OS platform on which the plugin is running cannot be properly determined.

Version 1.4.0 - 21 May 2018

Fix error when converting KPF files produced by Kindle Create version 1.6: CorruptError: malformed database schema (?)

Do not include extra metadata in OPF that could lead to duplicate cover pages when converting comics.

Support additional KFX features.

Version 1.3.0 - 09 Apr 2018

Fix error during conversion of books with referenced fonts that are not present: "'unicode' object has no attribute 'list_symbols'"

Support additional KFX features.

Version 1.2.0 - 02 Apr 2018

Added an option to proceed with conversion even if unknown or incorrect content is detected.

Handle additional features of KPF format produced by Kindle Create.

Fix KFX-ZIP archives not being created for e-book samples.

Fix debug message logging when creating KFX-ZIP archives.

Internal restructuring and performance improvements.

Version 1.1.0 - 31 Jan 2018

Added a built-in File Type Plugin to automatically gather the component files of a book and produce KFX-ZIP format during book import. This eliminates the need for the user to produce KFX-ZIP files manually, simplifying the process of importing KFX books into calibre. (DRM removal must still be accomplished by other means, prior to import.)

Added another built-in File Type Plugin to combine the components of a KFX-ZIP into monolithic KFX format. This process will only succeed if all of the components of the book are present in the KFX-ZIP and do not contain DRM. This makes it easier to determine whether on not the import was successful since a successful import will result in KFX format and an unsuccessful one will result in KFX-ZIP format.

Added a Metadata Reader Plugin to extract KFX book metadata. This allows the title, author, and other metadata to appear in the calibre book entry when importing a KFX book.

Ignore approximate page numbers created by the KFX Output plugin.

Handle changes to KPF format produced by Kindle Create 1.3.30.0 and Kindle Previewer 3.17.1.

Fix KPF format not being accepted for conversion using the GUI interface.

Allow conversion of additional KFX features.

Improve detection of unsupported KFX features.

Version 1.0.1 - 16 Oct 2017

Remove extraneous files that were inadvertently included in the initial release.

Version 1.0.0 - 16 Oct 2017

Initial release.

[jhowell]

Reserved post

[odamizu]

Awesome! Thank you, jhowell, for all your work unraveling KFX and making it more accessible to all!

[jhowell]

Originally Posted by odamizu

Awesome! Thank you, jhowell, for all your work unraveling KFX and making it more accessible to all!

You're welcome.

I know that this plugin isn't especially useful right now given the continued availability of KF8 and the lack of automatic DRM removal for KFX. But I thought it would be best to be prepared in case this capability is needed in the future.

[odamizu]

Originally Posted by jhowell

... I thought it would be best to be prepared in case this capability is needed in the future.

Absolutely! Hopefully KF8 and EPUB will continue to be available and accessible for a long time to come, but it gives me great comfort knowing your plug-in (and the Pascal decrypter) exists, just in case. for all your time and effort.

[Terisa de morgan]

Thank you very much, perhaps some of the things which you say they limit its usefulness will disappear in a near future.

[mbovenka]

Originally Posted by odamizu

Absolutely! Hopefully KF8 and EPUB will continue to be available and accessible for a long time to come, but it gives me great comfort knowing your plug-in (and the Pascal decrypter) exists, just in case. for all your time and effort.

+1. Not that I expect EPUB to go anywhere, as Amazon has no control over it, but KF8 might.

[odamizu]

Originally Posted by mbovenka

+1. Not that I expect EPUB to go anywhere, as Amazon has no control over it, but KF8 might.

Amazon isn't the only one we have to worry about. Adobe has their hardened DRM. So far ADE 2.0.1 still works for most Adobe epubs, but that could change.

[pdurrant]

Thank you for this most impressive bit of work.

[Iris-maybe]

I do not think this is unuseful right now since Epubor has update this software to remove Kindle KFX DRM yesterday. Unfortunately, they can not convert KFX. This is really what I need. Thanks for your contribution.

[JSWolf]

epubor is a rip-off of Calibre (overall).

[odamizu]

Originally Posted by JSWolf

epubor is a rip-off of Calibre (overall).

And epubor will likely soon rip-off jhowell's awesome KFX conversion plug-in

[JSWolf]

Originally Posted by odamizu

And epubor will likely soon rip-off jhowell's awesome KFX conversion plug-in

I would not be surprised if they do.

[issybird]

The rest of this conversation has been moved to a new thread here, per request. Please continue the conversation along those lines there; this thread is for the support of the KFX Input plugin only.

[luisdent]

I have decent luck so far, but one book "inferno" by dan brown won't convert to kfx. It seems to be any image files from what I can tell. If I removed the first graphic symbol on one of the pages, the next time i convert it errors on a further page... Any way to keep the graphic elements and still convert?