Convert XLSX to ODS

Convert XLSX to ODS instantly in your browser. Your spreadsheet data is processed on your device and never uploaded.

Your file never leaves your device.

How to convert XLSX to ODS

ODS is the OpenDocument spreadsheet format used by LibreOffice and many public administrations. This tool reads the XLSX with SheetJS, a proven spreadsheet engine, directly in your browser and writes a correct ODS file with the right encoding, escaping and structure. There are no rows to copy by hand and no data leaves your computer.

Step 1: Choose your XLSX file
Drag and drop a .xlsx, .xlsm, .xlsb file onto the converter or click to browse. It works on desktop, tablet and phone.
Step 2: Automatic conversion
Rows and columns are read and written as ODS in a fraction of a second.
Step 3: Download the ODS
Save each result individually, or download everything as a single ZIP when you convert several files.

Good to know

All sheets, values, formulas, number formats and column widths are carried over. Charts, pivot tables and macros are not converted.

Why use this XLSX to ODS converter?

ODS is the OpenDocument spreadsheet format used by LibreOffice and many public administrations.
Handles large files with thousands of rows.
Correct quoting and UTF-8 encoding.
100% local: spreadsheets often contain personal or financial data, and here it never leaves your device.

Is it free?

Yes. Converting XLSX to ODS is free, with no watermark, signup or email required. Local conversions have no artificial file-size or daily cap; the practical limit is your device.

Is my file uploaded?

The XLSX file is processed entirely in your browser. It is never uploaded, never stored and never seen by anyone, so this is safe for confidential files.

About the formats

What is XLSX?

XLSX (Excel Open XML) is the standard spreadsheet format from Microsoft Excel, also supported by Google Sheets and LibreOffice Calc. Data is organised into cells and sheets, with support for formulas, functions, charts and formatting. Because the file is a ZIP container of XML, its content stays readable and easy to process.

Use XLSX for tabular data that needs structure and calculation, budgets, inventories, lists and anything with formulas or multiple sheets. When you only need the raw data, you can export a single sheet to CSV or JSON here.

Excel Spreadsheet (XLSX)

What is ODS?

ODS is the spreadsheet format of the OpenDocument standard (ODF), an open, ISO-standardised format. It is the native format of LibreOffice Calc and Apache OpenOffice Calc. Like XLSX, an ODS file is a ZIP archive containing XML, with sheets, formulas, styles and charts. Microsoft Excel and Google Sheets can also open and save it.

Use ODS when you work with LibreOffice or when an open, vendor-independent format is required, as is common in public administrations. If your recipients mostly use Excel, XLSX avoids small formatting differences; for plain data exchange, CSV is enough.

ODS (OpenDocument spreadsheet)

Frequently Asked Questions

Is XLSX to ODS conversion free?

Yes. It is free, with no watermark, signup or email required. Local conversions have no artificial file-size or daily cap; the practical limit is your device.

What happens to formulas when converting XLSX to ODS?

Formulas are preserved together with their last calculated values.

Is it safe to convert xlsx to ods here?

Yes. The work happens on your own device with WebAssembly and browser APIs, so the file is not uploaded at all. You can even disconnect from the internet once the page has loaded.

Do I need to install anything?

No. Everything runs in a modern browser (Chrome, Edge, Firefox or Safari) on Windows, macOS, Linux, Android and iOS. There is no app, plugin or account.

Can I convert ODS back to XLSX?

Yes, there is a dedicated ODS to XLSX converter linked in the related tools below. Keep in mind that information dropped in one direction cannot always be restored in the other.

Need the opposite? Convert ODS to XLSX

ExcelProcessed locally