When you need ODS from XLS
XLS is the old Excel 97-2003 format. It still turns up in archives, accounting exports, templates, and old reports. ODS is needed when such a spreadsheet must be moved into an open OpenDocument format for editing, sharing, or storing without a dependency on old Excel.
Converting XLS to ODS is especially useful when switching to office suites that support open standards, in educational and government organizations, and in teams where spreadsheets are opened in different editors.
What is transferred to ODS
ODS generally receives cell values, sheets, basic formulas, column widths, fonts, borders, fills, and simple charts. The ODS format allows continued editing of the spreadsheet, so it is better than CSV when a working office document is needed rather than just a data export.
That said, XLS and ODS are structured differently. Macros, complex pivot tables, old external links, protected elements, and Excel-specific functions may behave differently or need manual review. If you only need a flat data export, use XLS to CSV. For the modern Excel format, use XLS to XLSX.
Which files it works well for
Good candidates for conversion: price lists, registries, reports, simple calculation tables, teaching materials, and archive workbooks with multiple sheets. After moving to ODS, such files can be edited and stored as open documents.
Be careful with workbooks where macros, automated buttons, external connections, complex charts, or calculations tied to old Excel behavior are important. For important documents, open the result and compare key sheets, formulas, and totals.
Related tasks
If ODS needs to go back to Excel, use ODS to XLSX or ODS to XLS. If the spreadsheet needs to be sent without editing, ODS to PDF or XLS to PDF are better options.
What is XLS to ODS conversion used for
Moving to an open format
Convert old Excel files to ODS for use in an OpenDocument environment.
Teaching spreadsheets
Prepare materials that need to open in different office editors.
XLS archive
Save old workbooks in an open format for future reading and editing.
Team sharing
Pass a spreadsheet to colleagues who do not use legacy Excel.
Tips for converting XLS to ODS
Check macros
If the XLS has buttons or automation, they may stop working after the move to ODS.
Compare totals
For calculation-heavy spreadsheets, verify key values before and after conversion.
Remove unnecessary sheets
Before converting, delete outdated hidden sheets and temporary calculations that the recipient does not need.
Choose CSV for data import
ODS is convenient for editing, but loading data into systems usually requires CSV.