Convert Excel (.xlsx) to CSV
Drop an .xlsx workbook and get a real, correctable preview of every sheet it contains, then download each one as CSV. Nothing is sent anywhere.
Convert Excel (.xlsx) to CSV
Drop your .xlsx file here
Up to 25MB per file. Stays on this device.
Nothing is sent anywhere. Turn off your Wi-Fi and this page still works - try it.
How it works
- Drop or choose an .xlsx workbook.
- Review each sheet it found: a real preview, with a toggle for whether the first row is a header.
- Download one sheet as CSV, or every sheet at once.
Source sheet
CSV grid
| Region | Region | |
|---|---|---|
| North | Widget | 120 |
| North | Gadget | 75 |
| South | Widget | 60 |
A1:B1 was one merged "Region" cell in the sheet. Unmerged, its value fills both A1 and B1 rather than leaving one blank.
Frequently asked questions
Is my file uploaded to a server?
No. The workbook is unzipped and read entirely on your device. Nothing is sent anywhere, and turning off your Wi-Fi after the page loads doesn’t stop it from working. This page loads 13KB of JavaScript, gzipped - about what your browser's network tab will show for this page's own scripts.
What about the older .xls format?
This tool reads .xlsx, the Open XML format Excel has used since 2007, not the older binary .xls format. Re-save an .xls file as .xlsx in Excel, LibreOffice, or Google Sheets first, then convert it here.
Does it handle dates correctly?
Yes, for the common case: a cell formatted as a date or date-time in the workbook is converted to a readable date (YYYY-MM-DD, or YYYY-MM-DDTHH:MM:SS if it carries a time) rather than the raw serial number spreadsheets store internally.
What if a sheet is hidden, or the workbook has formulas?
Hidden sheets are skipped, matching what you’d normally see when you open the file. A formula cell exports its last-calculated value, exactly what a plain CSV export from Excel itself would show; the formula text itself is not exported.
Is a password-protected workbook supported?
No. An encrypted or password-protected .xlsx can’t be read without the password, and this tool never asks for one. Remove the password in Excel first, then convert the file here.
Files are processed locally in your browser and never uploaded. Read more on the privacy page.