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LibreOffice Calc (recommended, available here)

  • From an open spreadsheet, select File > Save As > Text CSV

  • If you have more than one sheet, only the active sheet will be saved as CSV

  • Tip: LibreOffice is a free open-source application, and it handles international character sets and CSV files much better than Excel. It also does not “helpfully” change the format of your dates, change non-dates to dates, remove “decimals” from identification number strings, or convert ISBNs to scientific notation number format.
    If you’re not a regular user of LibreOffice, you can always create spreadsheets in the program of your choice, save, open in LibreOffice Calc, and then convert to CSV from there.