Convert XLSX to ODS — Online Excel to ODS Converter
Turn an Excel .xlsx or .xls workbook into an OpenDocument .ods spreadsheet right in your browser — the real LibreOffice engine, batch files, no upload.
Key Features
High-Fidelity Conversion
The real LibreOffice engine preserves formulas, formatting, sheets, and data exactly as you built them.
XLSX to ODS
Turn Excel .xlsx and .xls workbooks into OpenDocument .ods spreadsheets.
Batch Convert
Convert multiple files at once and download them together as a ZIP.
100% Local & Private
All conversion happens in your browser — your spreadsheets never leave your device.
No Office Required
No LibreOffice or Microsoft Excel installation needed — everything runs in the browser.
Free & No Sign-Up
No account, no install, no limits. Download results in one click.
About the Excel to ODS Converter
The XLSX to ODS converter turns Excel workbooks — .xlsx and the classic .xls — into OpenDocument .ods spreadsheets, the native format of LibreOffice and OpenOffice. Using the real LibreOffice engine compiled to WebAssembly, it preserves formulas, cell styles, sheet structure, and data faithfully, so the file opens in LibreOffice, Excel, or Google Sheets exactly as you built it. Everything runs locally in your browser: no upload, no account, and your data never leaves your device.
How to Convert
Converting files takes three simple steps:
Upload Files
Upload one or more .xlsx or .xls files — drag and drop or browse.
Automatic Conversion
Files convert to .ods in your browser — no need to wait or install anything.
Download
Download each file, or grab all converted files as a single ZIP.
Important Notes
Conversion runs entirely in your browser through the high-fidelity LibreOffice engine. Open this page over HTTPS (localhost counts) so the browser grants cross-origin isolation; files of any size are supported. All data stays on your device.