How it works
- Click Open your ODS to launch the editor in your browser.
- Pick the .ods file from your device, or drag and drop it onto the page.
- Edit cells and watch formulas recalculate — it is a live spreadsheet engine.
- Save it back as ODS, or export as XLSX, CSV or PDF.
ODS is the OpenDocument Spreadsheet format, what LibreOffice Calc and OpenOffice save by default. It is an open ISO standard, and it turns up whenever data comes out of an organisation that standardised on open formats — councils, universities, public data portals.
The OnlyOffice spreadsheet engine, compiled to WebAssembly, opens ODS as a live calculation engine rather than a static table: formulas recalculate as you edit, number formats and cell styling survive, and workbooks with several sheets open with all their tabs. Save it back as ODS to stay in the open format, or export to XLSX for someone on Excel, CSV for a data pipeline, or PDF for a fixed copy.
Core local editing: The file is read straight from disk into the browser tab, so nothing is uploaded — which is the point when the spreadsheet holds a budget, a member list or a data export you would rather not put through a third-party converter.
Frequently asked questions
Can I open an ODS file without LibreOffice?
Yes. This editor opens ODS directly in your browser — no LibreOffice, OpenOffice or Excel needed.
What is an ODS file?
ODS is OpenDocument Spreadsheet, the open ISO-standard spreadsheet format used by LibreOffice Calc and OpenOffice.
Do formulas still work?
Yes. It is a real calculation engine, so formulas recalculate as you edit rather than showing a frozen snapshot.
Can I save it back as ODS?
Yes. You can save it back in the same open format, or export as XLSX, CSV or PDF.
Can I convert ODS to Excel?
Yes. Open the ODS and save as XLSX — the conversion runs on your device.
Are workbooks with multiple sheets supported?
Yes. Workbooks with several tabs open with all their sheets intact.
Is my spreadsheet uploaded?
Core opening, editing and conversion run locally in your browser without a required document upload. The built-in AI assistant is unfinished and is not a released feature. An embedding host can receive exported files and upload them according to its own policy.
Does it work offline?
Offline editing requires the application, editor engine, converter and relevant fonts and format resources to be cached and retained by your browser. One visit or PWA installation does not guarantee this. Remote file URLs require a network connection.