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XLS to XLSX

Convert XLS spreadsheets to XLSX in seconds. XLS is best for older Excel and accounting software; XLSX is best for spreadsheets, accounts and data tables. Your files are processed on your own device.

  • No upload — 100% private
  • Fast, lossless when possible
  • Free & unlimited
  • Works on iPhone & Android

    How to convert XLS to XLSX

    1. 1

      Tap Choose files and select your XLS file(s).

    2. 2

      Adjust the options if you like (the defaults work well).

    3. 3

      Press Convert to XLSX. Several files can be downloaded together as a ZIP.

    XLS vs XLSX

    XLSXLSX
    Full nameExcel 97–2003 workbookMicrosoft Excel workbook
    Opens on iPhone◐ Partly / with an app◐ Partly / with an app
    Opens on Android◐ Partly / with an app◐ Partly / with an app
    Opens on Windows✓ Yes✓ Yes
    Opens on Mac◐ Partly / with an app◐ Partly / with an app

    XLS: XLS is the older binary Excel format. Some accounting and government software still exports it.

    XLSX: XLSX is the Excel spreadsheet format with multiple sheets, formulas and formatting. Google Sheets, Numbers and LibreOffice open it too.

    Frequently asked questions

    How do I convert XLS to XLSX on my phone?
    Open this page in your phone's browser, tap Choose files, pick your XLS file(s) and press the button. The XLSX file saves to Downloads.
    Is it free and unlimited?
    Yes. There's no sign-up, no watermark and no daily limit.
    Are my files uploaded?
    No. Conversion runs in your browser, so your documents and photos stay private.

    Rate this tool

    Be the first to rate it.

    Related conversions

    XLS to ODSXLS to CSVXLS to JSONXLS to HTMLXLS to PDFODS to XLSXCSV to XLSX

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