XLS to SXW Converter

Turn XLS spreadsheets into SXW documents online

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Legacy Office Compatibility

Convert XLS into SXW — the StarOffice Writer format compatible with older OpenOffice and LibreOffice installations.

Entirely Browser-Based

No installs, no plugins. Convert your XLS to SXW directly in any web browser from any operating system.

Privacy Protected

Your XLS upload is deleted instantly after processing. SXW results are purged from servers within 24 hours.

How to convert XLS to SXW

1

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

2

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

3

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

About formats

XLS is the binary spreadsheet format of Microsoft Excel, first introduced with Excel 1.0 for Macintosh in September 1985 and becoming the dominant spreadsheet format worldwide. The format stores workbooks as OLE2 compound document files using the Binary Interchange File Format (BIFF), organizing sheets, cells, formulas, formatting, charts, pivot tables, macros, and metadata across multiple internal streams. Each cell record encodes the cell's value (number, string, boolean, error, or formula), position, and formatting index, while shared string tables and style records reduce redundancy. The format evolved through BIFF versions (BIFF2 through BIFF8), with BIFF8 (Excel 97) establishing the structure used through Excel 2003. XLS supports up to 65,536 rows and 256 columns per sheet, a limit that drove the creation of XLSX. One advantage is universal spreadsheet compatibility — XLS files are recognized by every major spreadsheet application including LibreOffice Calc, Google Sheets, Apple Numbers, and dozens of programming libraries across all platforms. The format's mature feature set is another strength: XLS handles complex formulas, conditional formatting, data validation, named ranges, array formulas, external references, and VBA macros. Although XLSX replaced XLS as the default in Office 2007, the binary format persists in financial institutions, legacy reporting systems, and any environment where Excel 97-2003 compatibility is required.
Developer: Microsoft
Initial release: September 1985
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

Frequently Asked Questions

Why convert XLS to SXW?

SXW is the legacy StarOffice/OpenOffice Writer format — converting XLS lets you use spreadsheet data in older OpenOffice environments.

What programs open SXW files?

OpenOffice Writer, LibreOffice Writer, and StarOffice handle SXW natively. Microsoft Word can also open SXW files with some compatibility.

Is the XLS table structure kept?

Yes — your tabular data, cell content, and basic formatting transfer into the SXW document for continued editing.

Is this service free?

Convertio.co offers free XLS to SXW conversion. Premium plans are available for users needing larger limits or faster queues.

Do I need to sign up?

No registration is needed. Just visit convertio.co, upload your XLS, select SXW, and download the result.

XLS to SXW Quality Rating

5.0 (2 votes)
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