Tool Fu
$ toolfu run excel-to-csv

Excel to CSV Converter — Convert Excel to CSV Online Free

Convert Excel spreadsheets to CSV format online for free. Supports XLSX, XLS, multiple sheets, and custom delimiters — runs in your browser.

all processing runs in your browser
excel-to-csv
delimiter

$ drop an Excel file here or click to browse

supports .xlsx, .xls, .xlsb, .xlsm, .ods — max 50MB

or paste from clipboard (⌘V / Ctrl+V)

Free Excel to CSV Converter

Convert Excel files to CSV format instantly in your browser. Supports all major spreadsheet formats.

Features

  • XLSX, XLS, XLSB, XLSM, ODS support
  • Multiple sheet handling
  • Custom delimiters (comma, tab, semicolon, pipe)
  • Download individual or all sheets
  • 100% private — runs in your browser
$ cat FAQ.md
What Excel formats are supported?
XLSX, XLS, XLSB, XLSM, and ODS files are all supported via the SheetJS library.
Does it handle multiple sheets?
Yes. All sheets are parsed and you can switch between them. Download individual sheets or all at once.
Is my spreadsheet uploaded?
No. Parsing runs entirely in your browser using SheetJS. Your data never leaves your device.
Can I change the delimiter?
Yes. Choose between comma, tab, semicolon, or pipe delimiters.