Free Excel ↔ CSV converter
Turn an Excel workbook into a CSV, or a CSV into a proper Excel file — pick the sheet, preview the data and download. The conversion happens locally in your browser.
How it works
A converter that keeps your data on your machine.
Choose an .xlsx/.xls to convert to CSV, or a .csv to convert to Excel.
Multi-sheet workbooks let you pick which sheet becomes the CSV.
Check the first rows, then download the converted file with one click.
Everything runs in-browser — your file is never sent anywhere.
FAQ
Is my spreadsheet uploaded?
No. The conversion runs entirely in your browser, so the file never leaves your computer — suitable for confidential data.
Can I pick which sheet to export?
Yes. For multi-sheet workbooks, each sheet shows as a tab; the sheet you select is the one exported to CSV.
Does it keep my numbers and dates?
Values are exported as they appear in the sheet. CSV is plain text, so formatting is dropped, but the underlying values are preserved.
Can it go the other way, CSV to Excel?
Yes. Upload a .csv and the tool builds a proper .xlsx workbook you can download and open in Excel or Google Sheets.
Doing this on real spreadsheets, every week?
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