ODS, the open spreadsheet
ODS is the open standard spreadsheet format of LibreOffice and OpenOffice.
Strengths: It does not depend on any vendor and many public bodies require it.
Limits: Outside LibreOffice not everyone opens it comfortably.
Data
Turn your ODS files into XLSX in seconds. Everything happens in your browser: nothing is uploaded to any server.
Drag your files here
Or paste them with Ctrl+V. They never leave your device.
Outside LibreOffice not everyone opens it comfortably. As XLSX you open it in Excel with its columns and sheets.
ODS is the open standard spreadsheet format of LibreOffice and OpenOffice.
Strengths: It does not depend on any vendor and many public bodies require it.
Limits: Outside LibreOffice not everyone opens it comfortably.
XLSX is the Microsoft Excel format: a workbook with one or more sheets, data types and formatting.
Strengths: It is what almost any office expects.
Limits: Other apps and databases usually ask for CSV to import data.
No. The ODS to XLSX conversion runs entirely in your browser, with code downloaded from this site and executed on your device. You can check it in the Network tab of the developer tools or by going offline after the page loads.
Up to 1 GB on desktop and about 200 MB on mobile, although a huge spreadsheet may take a few seconds.
Yes. Drop as many ODS files as you like: several are converted at the same time, depending on your processor cores, and when they finish you can download each XLSX or all of them in a ZIP.