Online Tool Store
Excel to CSV Converter
Convert any sheet in an .xlsx workbook to CSV, with a choice of delimiter and a live preview before download. Runs entirely in your browser.
🔒 This tool runs entirely in your browser. Your files are never uploaded to a server.
How it works
- Choose an .xlsx file — every sheet inside it is listed.
- Pick a sheet and a delimiter (comma, semicolon, or tab).
- Preview the CSV, then copy it or download the file.
FAQ
Does this support the older .xls format?
No — only the modern .xlsx format (Excel 2007 and later). Open an .xls file in Excel or Google Sheets and save/export it as .xlsx first.
What happens to formulas?
The CSV includes each formula's last-calculated result, not the formula text itself — the same way Excel's own "Save As CSV" behaves, since CSV has no concept of formulas.
Can I extract just one sheet from a multi-sheet workbook?
Yes — every sheet in the workbook shows up in the Sheet dropdown, and only the selected one is converted and downloaded.
Is my spreadsheet uploaded anywhere?
No — the file is parsed and converted entirely in your browser using the ExcelJS library. It never leaves your device.
How we compare
| Feature | Online Tool Store | Excel's "Save As" | Online converters |
|---|---|---|---|
| No Excel/Office install needed | ✓ | Requires Excel | ✓ |
| No file upload — runs in your browser | ✓ | ✓ | Uploads to a server |
| No ads | ✓ | ✓ | Ad-supported |
Handy on a device without Excel installed, or when a spreadsheet with something sensitive in it shouldn't go through a third-party upload.