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FreeConvertter

XLSX to ODS Converter

Convert Excel workbooks to the open OpenDocument format.

XLSXto

or drag and drop them here · up to 50 MB per file

Your files are processed on this device and never uploaded.

Instant conversion

There is no upload or server queue, so conversion starts the moment you drop a file and finishes as fast as your device can process it.

Your files stay private

Files are processed entirely inside your browser. They are never sent to, stored on, or seen by any server.

Nothing to install

Works on Windows, macOS, Linux, Android and iOS in any modern browser. No software, no extensions, no account.

How to convert XLSX to ODS

  1. 1

    Click "Choose XLSX files" or drop your Excel workbooks onto the converter.

  2. 2

    Click "Convert" to convert the workbook on your device.

  3. 3

    Click "Download" to save the .ods file.

  4. 4

    Open it in LibreOffice Calc or any ODS-compatible app.

Why convert XLSX to ODS?

  • Open standards — submit documents where OpenDocument is required.
  • LibreOffice users — give colleagues a file in their native format.

How the conversion works

The Excel workbook is read with SheetJS and written as an OpenDocument spreadsheet, keeping sheets, values, formulas and number formats.

What is an XLSX file?

XLSX is Microsoft Excel’s default workbook format since 2007, based on the Office Open XML standard. A workbook can contain several sheets, each a grid of cells holding text, numbers, dates or formulas, together with formatting, charts and comments. Inside, it is a ZIP archive of XML files.

XLSX opens in Excel, Google Sheets, LibreOffice Calc, Apple Numbers and Hancom Cell. Files ending in .xlsm are the same format with macros enabled.

What is an ODS file?

ODS (OpenDocument Spreadsheet) is the open, ISO-standardised spreadsheet format used by LibreOffice Calc and Apache OpenOffice, and widely required by public institutions in Europe. Like XLSX, it is a ZIP archive of XML files containing sheets, values, formulas and styles.

Excel and Google Sheets can open ODS files, but converting to XLSX gives the best compatibility with Microsoft Office users.

Frequently asked questions

What is kept?

All sheets and their names, cell values, formulas and number formats.

What is not kept?

Visual styling (fonts, colours, borders, column widths), charts, images and macros.

Why would I need ODS?

ODS is an open ISO standard required by some governments and institutions, and it is the native format of LibreOffice.

Is my file uploaded?

No. The conversion runs in your browser.

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