SXW to AZW3 Converter

SXW to AZW3 — turn legacy documents into Kindle ebooks

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Kindle-Ready Output

Turn legacy SXW documents into AZW3 files optimized for Kindle — enjoy reflowable text and adjustable font sizes.

Private Conversion

Your SXW uploads are deleted after processing and AZW3 files are purged within 24 hours — your content stays confidential.

Cloud-Powered

Conversion runs entirely on Convertio servers. No software needed on your end — just upload, convert, and download.

How to convert SXW to AZW3

1

Select files from Computer, Google Drive, Dropbox, URL or by dragging it on the page.

2

Choose azw3 or any other format you need as a result (more than 200 formats supported)

3

Let the file convert and you can download your azw3 file right afterwards

About formats

SXW is the word processing document format used by StarOffice 6.0 and OpenOffice.org 1.0, developed by Sun Microsystems and released in 2002. The format was one of the first mainstream office document formats to adopt an XML-based architecture, packaging document content, styles, metadata, and embedded media in a ZIP archive — a structural approach that directly influenced the later OpenDocument Format (ODF). The content.xml file describes the document body using XML elements for paragraphs, headings, lists, tables, footnotes, and inline formatting, while styles.xml defines the styling rules and meta.xml carries document properties. SXW represented a significant milestone in open-source office software, demonstrating that a non-proprietary XML format could handle the full range of word processing features including change tracking, indexes, cross-references, and complex page layouts. One advantage was transparency and openness — the XML structure made document content inspectable, transformable, and processable using standard tools, a sharp contrast to the opaque binary formats dominant at the time. The format's role as a technological precursor to the ODF standard is another historical significance: the OASIS OpenDocument Technical Committee used the OpenOffice.org XML format (including SXW) as the starting point for developing ODF 1.0. While SXW was superseded by ODT with OpenOffice.org 2.0 in 2005, existing SXW documents can be opened by LibreOffice, Apache OpenOffice, and document conversion tools.
Developer: Sun Microsystems
Initial release: 2002
AZW3, also known as Kindle Format 8 (KF8), is Amazon's advanced ebook format introduced in November 2011 alongside the first Kindle Fire tablet. It replaced the older MOBI-based AZW format with a substantially more capable layout engine built on HTML5 and CSS3 subsets, enabling fixed layouts, embedded fonts, SVG graphics, drop caps, and other typographic refinements that were impossible in earlier Kindle formats. Internally, an AZW3 file packages content in a structure derived from EPUB, wrapped in Amazon's proprietary Palm database container with optional DRM protection. The format supports both reflowable text for novels and fixed-layout pages for comics, cookbooks, and children's titles. One major advantage is rich formatting fidelity — publishers can produce visually sophisticated ebooks with complex page designs, nested tables, and precise font control that render consistently across the Kindle ecosystem. Another strength is backward compatibility: AZW3 files can bundle a MOBI fallback section so older Kindle hardware still displays the content, even without full KF8 rendering. The format integrates tightly with Amazon's Kindle platform, supporting features like X-Ray, Whispersync page tracking, and in-book dictionary lookups across millions of devices and apps worldwide.
Developer: Amazon
Initial release: November 2011

Frequently Asked Questions

Why convert SXW to AZW3?

AZW3 is the modern Kindle format — converting SXW lets you read old StarOffice documents on any Kindle device or app.

What reads AZW3 files?

Amazon Kindle devices, the Kindle app on iOS/Android/PC/Mac, and Calibre ebook manager all handle AZW3 files natively.

Do I need to register to convert SXW to AZW3?

No account is required. You can convert SXW to AZW3 directly without signing up — just upload, convert, and download.

Is SXW to AZW3 conversion free?

Basic conversions are free on Convertio. Premium plans are available for users with larger files or frequent conversion needs.

Can I convert on my phone?

Yes. The converter runs in any mobile browser — convert and download AZW3 files right from your smartphone or tablet.

Are images from my SXW preserved?

Embedded images transfer to the AZW3 output, appearing inline with the text content just as in the original SXW document.