Convert XLSX to ODS Online Free — No Upload, Formatting Kept
Turn Excel .xlsx workbooks into OpenDocument .ods for LibreOffice and OpenOffice — formulas, dates and styles stay intact. No upload, no signup, no limits.
Drop .xlsx or .xlsm files here, or click to browse
Supports .xlsx, .xlsm · processed locally · never uploaded
How to Convert XLSX to ODS Online
- Drop one or more .xlsx / .xlsm files into the box above — files are processed locally and never uploaded.
- Click Convert to ODS — every workbook is parsed and repacked in the OpenDocument spreadsheet format.
- Check the report — each file lists the worksheets that were converted, by name.
- Download — a single file downloads directly; multiple files come back bundled as a ZIP.
Why Convert XLSX to ODS
The .ods format is the native format of LibreOffice Calc and OpenOffice, defined by the ISO-standard OpenDocument specification. If you (or the people you work with) live in the open-source office world, delivering .ods removes every import quirk: the file opens natively, with no conversion warnings and no feature lottery.
Government agencies, universities and public bodies in many countries mandate OpenDocument for archival and interchange, because the specification is open and vendor-neutral. Converting your Excel deliverables to .ods once, properly, keeps you compliant without giving up Excel as your working tool.
Macros do not survive: the .ods format cannot store VBA projects, so any macros inside a .xlsm workbook are dropped during conversion. Keep the original .xlsm if you still need the macros.
XLSX vs ODS at a Glance
Under the hood the two formats are close cousins — both are XML packed into a ZIP — but they answer to different standards bodies and different default applications.
| Aspect | .xlsx (Excel 2007+) | .ods (OpenDocument) |
|---|---|---|
| Internal structure | XML files in a ZIP archive | XML files in a ZIP archive |
| Governing standard | ECMA-376 / ISO/IEC 29500 (OOXML) | ISO/IEC 26300 (OpenDocument) |
| Formula language | Excel formula syntax | OpenFormula (ODF formulas) |
| Default application | Microsoft Excel | LibreOffice Calc, OpenOffice |
| Macro support | VBA (only in .xlsm) | Basic/other scripts, no VBA |
| Ecosystem support | Virtually all spreadsheet tools and services | Open-source suites, public-sector mandates |
What the Conversion Preserves
The converter reads the OOXML of the source workbook and rebuilds it as OpenDocument XML, keeping the workbook structure intact.
- Cell values — text, numbers, booleans and error codes stay exactly as they were.
- Dates keep their value and display format, so they look identical in LibreOffice Calc.
- Formulas are translated to OpenFormula syntax where a direct equivalent exists; the last calculated result is always kept.
- Multiple sheets keep their names and order, along with basics like column widths and merged cells.
Limitations
- Only .xlsx and .xlsm are accepted — legacy .xls (Excel 97–2003) is not supported; convert it to .xlsx first.
- VBA macros in .xlsm files are dropped, because .ods cannot store them.
- A few Excel functions have no OpenFormula equivalent; those cells keep their last calculated result as a static value.
- Encrypted .xlsx files (password required to open) cannot be converted.
- Only convert files you own or have permission to modify.
Frequently Asked Questions
Is this XLSX to ODS converter really free?
Yes — 100% free, with no sign-up, no watermark and no file limit. Everything runs in your browser.
Are my files uploaded to a server?
No. Parsing and repacking happen entirely in your browser with JavaScript; your file never leaves your device.
Will formulas survive the XLSX to ODS conversion?
Values always do. Formulas are translated from Excel syntax to OpenFormula where an equivalent exists; for the few without one, the last calculated result is kept as a static value.
What happens to macros in my .xlsm file?
They are dropped. The OpenDocument spreadsheet format has no place to store a VBA project, so macros cannot be carried over. Keep the original .xlsm if you still rely on them.
Can LibreOffice open XLSX files directly?
It can, but the import is lossy for some formatting and features. Converting to .ods once gives you a native file that behaves predictably in every OpenDocument application.
Can it convert a password-protected XLSX file?
If a password is required to open the file, no — that is genuine encryption. Mere cell or sheet protection without an open password does not block conversion.
Can I convert several files at once?
Yes. Drop multiple .xlsx or .xlsm files and convert them in one pass; the results download together as a ZIP.
Will my spreadsheet look the same after conversion?
For typical sheets, yes — values, dates and layout carry over. Exotic Excel features (rare chart types, form controls, pivot embellishments) have no OpenDocument equivalent and may be simplified or dropped.
Related Tools
Need to view or edit the workbook before or after converting?
Open the free online Excel editor