The ePub format is one of the many open source eBook file formats available. Initially released in 2007, it succeeded the legacy Open eBook format. The format was first defined by the Open eBook forum, part of the international digital publishing forum. EPUB digital books and publications all have the associated .epub extension and can be opened and viewed on any compatible device, software application, smartphone, or dedicated reader. The format is capable of optimizing the resolution of digital publications to suite the resolution of the device being used, making it inherently a 'reflowable' format.
The American company Amazon is a recognized powerhouse when it comes to all things related to books. Their proprietary eBook readers dubbed the Kindle which was first released in 2007 is a testament to this. The .azw file format is the filename extension associated with eBooks designed to be read on Amazon's proprietary Kindle device and through their free but closed source Kindle software for smartphones, PCs, and Macs. The format is incompatible with any device other than kindle and its associated software. In order to open files saved in this format on non-kindle devices, one would have to convert the file to another format such as the open ePub format or PDF. Some converters can also convert other formats into .azw files which can later be opened on a kindle device or application.
FreeFileConvert uses tuned encoding for EPUB to AZW3 conversions, preserving clarity while trimming file size. Finished ebooks download instantly across phones, tablets, desktops, and modern browsers without extra tweaks.
Upload EPUB files from desktop or tablet, queue multiple jobs, and let the converter finish autonomously. Return whenever convenient to download synchronized AZW3 results on any device you rely on.
Process up to 5 files sized 1024 MB per batch without splitting queues manually. Mixed-format uploads convert together, producing consistent AZW3 ebooks with dependable progress tracking.
The EPUB or electronic publication format is formally standardized in ISO/IEC TS 30135. Its structure is an extension of XHTML and XML and has optional support for cascaded style sheets. The format allows for documents that contain images either in raster or vector graphics format. Digital rights management is also supported.
Because the AZW format restricts content to kindle devices and software, it has become a popularized format for authors wishing to enforce digital rights management and copyright restrictions over their content. It supports richly formatted text and enables documents to be reflowable i.e. able to be presented on a multitude of devices with varying screen sizes.
Upload your ebook file in the EPUB format from your device.
Select AZW3 as the output format and click Convert. Adjust optional settings if needed.
Download the converted ebook file. Each file stays available for up to 5 downloads.
Kindle ecosystems historically preferred AZW3. Converting a DRM-free EPUB to AZW3 helps sideload books onto newer Kindles and Kindle apps that prefer AZW3.
Amazon has been moving away from MOBI for new personal documents, but many users still convert to MOBI/AZW3 for sideloading older devices. AZW3 is usually the better modern Kindle target when available.
Only convert files you have the right to process. DRM-protected purchases typically will not convert until the publisher allows a DRM-free copy.
Upload your EPUB, select AZW3, and convert. Transfer the result to your Kindle via USB or the method your device supports.
Yes within free-tier limits. Outputs remain available for up to 5 downloads.