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.XLSX file extension

To open .XLSX files on Windows, open in microsoft excel..

.xlsx files are spreadsheet workbooks. Open them with Microsoft Excel, LibreOffice Calc, or Google Sheets.

Home Extension Index Documents in index Documents category page

Open on your device

Choose your operating system for a dedicated step-by-step opening guide.

How to open .XLSX files

Use these platform-specific instructions to open .XLSX files safely.

Windows

  1. Open in Microsoft Excel.
  2. If formulas fail, recalculate and check linked workbook references.
Full Windows guide

Mac

  1. Open in Excel or Numbers.
  2. Convert to native format only after verifying formulas and date parsing.
Full Mac guide

Linux

  1. Open with LibreOffice Calc or OnlyOffice.
  2. Review locale settings for decimal and date separators.
Full Linux guide

iOS

  1. Open in Excel mobile or Numbers from Files.
  2. Use OneDrive or iCloud to preserve version history.
Full iOS guide

Android

  1. Open with Excel or Google Sheets.
  2. Use the import preview to verify delimiters and chart rendering.
Full Android guide

Can't open this file?

These are the most common causes and fixes when .XLSX files fail to open.

Common reasons

  • Formulas return errors after import

Fix steps

  1. Check locale settings.
  2. Re-enter formulas in the target app.
  3. Use a CSV export for plain data transfer.

OS-specific troubleshooting

Convert .XLSX to other formats

Use conversion tools to change .XLSX files into formats your software supports.

What is a .XLSX file?

XLSX is the default Excel workbook format based on Office Open XML. It packages worksheet XML and assets inside a ZIP container.

Common MIME types: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet

Common .XLSX issues

Formulas return errors after import

Locale or compatibility differences can alter formula separators and function names.

  1. Check locale settings.
  2. Re-enter formulas in the target app.
  3. Use a CSV export for plain data transfer.

Security notes

  • Inspect external links and data connections before enabling refresh.
  • Avoid opening unknown spreadsheets that request content enablement.
  • Use protected view for email attachments.

FAQ

Why does my chart look different?

Chart engines differ between apps. Open in Excel for highest fidelity.

Can XLSX be opened as CSV?

You can export to CSV, but formulas, multiple sheets, and formatting are lost.

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