XLSX to CSV converter
To convert XLSX to CSV, drop your XLSX file in the box below. It converts straight away; press Download to save the CSV. It all happens in your browser, so your file stays on your device.
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Converted on this device, never uploaded
What changes
| XLSX to CSV | What happens |
|---|---|
| Sheets | The first sheet, or any sheet you pick (one sheet per CSV) |
| Dates | Written as ISO dates (2026-03-02), not Excel’s day numbers |
| Numbers | As Excel shows them in General, up to 15 digits; text cells like 0042 stay as written |
| Formulas | Their last saved result |
| Old .xls files | Not supported: save them as .xlsx first |
How to convert XLSX to CSV
- Add your XLSX. Drop the file in the box, or click to choose it. It becomes CSV straight away.
- Check the result. Look at the preview. The delimiter and value types are set for you; change them if needed.
- Download. Press Download to save the CSV.
Why CSV
Get a sheet out of an Excel workbook as CSV, the format almost every app, database and script can import.
Questions
Yes. When the workbook has several sheets, pick one under Sheet.
That is the ISO format every program reads the same way, wherever you are. Excel stores dates as day numbers; they are turned back into dates here.
Turn on “Excel-friendly” before downloading. It adds a UTF-8 mark so Excel reads accents correctly.
No. The conversion happens right in your browser, so your file stays on your device. There is no account to make, either.