uDocumentViewer
Convert.xlsx · .xls

Convert Excel to CSV online

100% localFiles never leave your device — no upload, no account, no tracking.
About Excel to CSV

Turn an Excel workbook's first sheet into a plain CSV that imports anywhere — databases, scripts, and other tools. We parse the spreadsheet locally with SheetJS.

The conversion runs entirely in your browser. Your data never leaves your device.

How it works
  1. 01

    Add a spreadsheet

    Drop your XLSX or XLS file onto the page or pick it from your device.

  2. 02

    Convert

    Click Convert to export the first sheet as CSV locally.

  3. 03

    Download

    Save the CSV file.

Features
plain CSVfirst sheetno install
Frequently asked
How does the Excel to CSV converter work?
Turn an Excel workbook's first sheet into a plain CSV that imports anywhere — databases, scripts, and other tools. We parse the spreadsheet locally with SheetJS.
Are my files uploaded to a server?
No. Everything runs entirely in your browser using local JavaScript and WebAssembly. Your files never leave your device.
Does it cost anything or require an account?
No. The converter is free, needs no sign-up, and runs locally in your browser.
Related converters
Open these files in a viewer