You do not need to install an office suite just to open an occasional file. Export to common office formats when you are ready to keep working or share.
Files are opened and processed on your device, with no document upload or account required.
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.
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?
No. When you open local files directly on this site, viewing, editing and conversion happen on your device without uploading your documents.
Does it work offline?
Yes, with some preparation. Open the files you need online and try editing and exporting, then disconnect to check they work. Clearing browser data may require reconnecting. Files opened from links need a connection.