Convert spreadsheets (XLSX ↔ CSV/JSON)
Excel in, data out — and back the other way. Pick the sheet, get a clean CSV or JSON.
Runs on your device
No uploads, ever
Free, no account
How it works
- Drop a spreadsheet or tabular file
XLSX, XLS, ODS in — or CSV/JSON to build a workbook.
- Choose the direction and sheet
Multi-sheet workbooks let you convert one sheet at a time, or all of them at once.
- Download
CSV or JSON for outgoing data; a proper .xlsx for anything headed to Excel.
Questions people actually ask
Are formulas evaluated?
Cached values are used — what you last saw in Excel is what converts. The formulas themselves live on in the original file.
My dates changed format!
The classic Excel-dates-in-CSV problem. Dates export as readable ISO values; if a column looks wrong, check the sheet's own formatting first.