Azw3 File

[Anthony Small]

KindleFile Format is a proprietary e-book file format created by Amazon.com that can be downloaded and read on devices like smartphones, tablets, computers, or e-readers that have Amazon's Kindle app. E-book files in the Kindle File Format originally had the filename extension .azw; version 8 (KF8) introduced HTML5 & CSS3 features and have the .azw3 extension, and version 10 introduced a new typesetting and layout engine featuring hyphens, kerning, & ligatures and have the .kfx extension.

Kindle devices and apps are designed to use Amazon's e-book formats: AZW that is based on Mobipocket; in fourth generation and later Kindles, AZW3, also called KF8; and in seventh generation and later Kindles, KFX.[1] When uploaded via the Send to Kindle service Kindles now support the EPUB file format used by many other e-book readers. Similar to EPUB, Amazon's file formats are intended for reflowable, richly formatted e-book content and support DRM restrictions, but unlike EPUB, they are proprietary formats. AZW files debuted with the first Amazon Kindle in 2007.

Software such as the free and open source Calibre, Amazon's KindleGen,[2][3] and the email based Send-to-Kindle service are available to convert e-books into supported Kindle file formats. Kindle devices can also display some generic document formats such as plain text (TXT) and Portable Document Format (PDF) files; however, reflowing is not supported for these file types.

In late 2011, the Kindle Fire introduced "Kindle Format 8" (KF8), also known as AZW3 file format.[4] AZW3 supports a subset of HTML5 and CSS3 features,[5] while acting as a container for a backwards-compatible MOBI content document.[6][7]

In August 2015, all the Kindle e-readers released within the previous two years were updated with a new typesetting and layout engine that adds hyphens, kerning and ligatures to the text; e-books that support this engine require the use of the "Kindle Format 10" (KFX) file format.[8] E-books that support the enhanced typesetting format are indicated in the e-book's description on its product page.

In 2022, while the Send-to-Kindle service only supported the original .mobi/.azw ebook formats (along with some other non-ebook file formats),[10] Amazon announced removing this support in favor of .epub which will be converted to Amazon's KF8 (.azw3) from late-2022.[11][12][10]

I am trying to convert my ebooks from epub format to mobi/azw3, in order to put them onto my Kindle App and Paperwhite. Everything works fine except the book covers don't show up in kindle app. There's no description also, so it's impossible to recognise which book I'm opening. I am using Calibre (osX) for the conversion.

Unfortunately, that's the default behavior, because the Kindle for PC/OSX app will only display covers for "personal documents," i.e. ePubs converted with Kindle Previewer/KindleGen, or books bought from Amazon.

AFAIK, Calibre adds a fake ASIN and changes other metadata items so that books no longer appear in the Personal Documents folder. However, this change also causes the book to be displayed without a cover in the Kindle for PC/OSX apps.

Whenever I upload a Calibre-converted .azw3 file to my new (third-generation) Kindle Paperwhite the cover does not show on the device. I am aware that similar problems have been reported to you before, but I have found a simple solution you might not be aware of.

After playing around with Calibre and using the 'Edit book' feature I have noticed that whenever an .epub file is converted to .azw3 a smaller duplicate of the .jpg cover file is created (150x240 px or similar size).

It is enough to delete the duplicate cover ('Edit book' > 'AZW3' > select duplicate cover file, e.g. '00002.jpeg' > 'Delete the selected file') and upload the file again to the device for the cover image to show up correctly.

As it would take a long time to manually delete the duplicate .jpeg file from all of the converted books in my library (and I am sure I am not the only user who is experiencing this problem), I wonder whether it would be possible to stop Calibre from creating the smaller duplicate cover in the first place.

The duplicate jpeg file is a cover thumbnail and is required by the azw3

format. As long as you use the calibre send to device button to send

books to your PaperWhite the cover will show up. If you transfer books

some other way, then whether the cover shows up or not is dependent on

various things.

I cannot replicate your results. Sending books to my PaperWhite via send

to device always shows covers on the device. Deleting the thumbnail from

the file before sending makes no difference.

Incidentally, the reason that covers show up when using send to device

in calibre is because calibre uploads a thumbnail for the book

manually, so that the Kindle never needs to go and look for the

thumbnail in the file at all. If they aren't showing up for you, then

something is going wrong. Make sure you are running an up to date

version of calibre, and if you are, then start in in debug mode and send

a book to your device, and post the debug log.

AZW3 is a variation of AZW and also known as KF8 (Kindle Format8). It was released by Amazon in 2011 along with the release of Kindle Fire. At beginning it was only supported by Kindle Fire tablet, but later expanded to Kindle 4th generation and Kindle for PC/Mac.

Nowadays Kindle books directly downloaded to recent generations E-Ink Kindle or downloaded from the Amazon official website are usually saved as AZW3 format and protected by DRM. And some AZW files downloaded from Kindle for PC/Mac would also turn to AZW3 after the DRM protection is removed.

PRC is a old Kindle format adopted in the Kindle books from early Kindle Android app. From Kindle for Android V7.2 and later versions, all the downloaded Kindle files are KFX format, not the old PRC format. And currently there isn't any effective method to directly remove DRM from the Kindle KFX books via Kindle Android app (including Kindle Fire tablet).

Mobi is actually not an independent format. It can be viewed as the mixture of prc and azw3. The ebook html content is saved as 2 formats in a mobi file after processed twice, one is in prc format and the other is in azw3 format. The file format is compatible in the early Kindle ereaders which can be rendered greatly on these devices.

Generally speaking, all the formats above are basically generated upon Mobi and AZW, but the Topaz, or the variations TPZ and AZW1, are pretty different. And the difference mainly lies in the file structure and database.

An AZW6 file only contains texts. All the images in the book are saved in the related folder. So if you convert an AZW6 book to another format, all the images will be lost, as they are not contained in the book file.

Imagine you buy a Kindke AZW6 book (you don't know its format before buying) in a place with poor WiFi network, then this book will download low quality images, you needn't wait a long time to start reading the book. When you go to a place with strong WiFi, Kindle will download high quality images to replace those low quality images automatically.

Portable Document Format (PDF) is the most widely used file format which is created by Adobe. Except Amazon Kindle, almost all other retailers/devices support PDF files. Ebooks in PDF format are usually protected by Adobe adept DRM or the proprietary DRM adopted by the specific retailers.

There're many privileges of PDF that other formats can't compete with. PDF files can preserve and retain the original formatting of file. The display effect preserves when reading a PDF on different devices or platforms. PDF files are designed to deliver content suit for A4 or letter scale. Content in PDF is not relowable, so there might be problematic when reading PDF in a handheld device. It can provide the best display effect when reading on computers, but it's not a good idea to read PDF files with small screens in most mobile eReaders.

We can't avoid buying epub or pdf format eBooks, and we can't (and in fact there is no need to) buy all those main popular reading devices at hand. So talking about which one is the best is meaningless. The perfect solution is to use Epubor Ultimate, an eBook Converter tool to help you convert eBooks formats between Kindle Mobi and ePub, PDF with high quality.

I purchased a textbook from amazon.

I want to remove DRM so that I could sync it to iBooks (I don't like kindle reader), and also so that one day Amazon doesn't just decide to pull it off if the lose a contract with the publisher (like that 1984 conundrum).

Are you having problems opening an AZW3 file or are you simply curious about its contents? We're here to explain the properties of these files and provide you with software that can open or handle your AZW3 files.

These AZW3 files are digital documents saved in a proprietary ebook format known as Kindle Format 8. Amazon developed this file format as an update to their .azw format. A .azw3 file may contain text, images, links, other media files, text formatting attributes, and metadata information.

Also known as Amazon KF8, these .azw3 files can be opened by applications like Amazon Kindle for PC, Kindle Previewer, and other ebook viewers with compatibility support for the AZW3 format. Some applications can convert these AZW3 files to more popular ebook formats like PDF. Word processing tools like Microsoft Word and other applications like Adobe InDesign may create documents that can be converted into an AZW3 ebook.

These apps are known to open certain types of AZW3 files. Remember, different programs may use AZW3 files for different purposes, so you may need to try out a few of them to be able to open your specific file.

Not sure exactly what type of file you are trying to open? Try our new File Analyzer. It is a free tool that can identify more than 11,000 different kinds of files - most likely yours too! It will help you find software that can handle your specific type of file. Download File Analyzer here.

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