.XLSX file extension
To open .XLSX files on Windows, open with Microsoft Excel by double-clicking the file.
XLSX files are spreadsheet workbooks that can be opened with Microsoft Excel, Google Sheets, or LibreOffice Calc.
Last updated: March 19, 2026 · Reviewed by Julian Stricker
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
- Open with Microsoft Excel by double-clicking the file.
- If issues arise, right-click the file and select 'Open with' to choose Excel.
Mac
- Double-click to open in Excel or drag the file into Numbers.
- Check formulas and dates after opening in Numbers.
Linux
- Open with LibreOffice Calc by right-clicking and selecting 'Open with'.
- Ensure locale settings match for accurate data representation.
iOS
- Open in Excel mobile from the Files app or use Numbers for basic viewing.
Android
- Use the Excel app or Google Sheets to open directly from your device.
Security notes
- Be cautious with external links and data connections.
- Avoid enabling macros in files from unknown sources.
- Use protected view for files received via email.
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Can't open this file?
These are the most common causes and fixes when .XLSX files fail to open.
Common reasons
- Formulas return errors
- File won't open
Fix steps
- Verify the locale settings in your application.
- Re-enter the formulas manually if necessary.
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 format for Excel workbooks, utilizing the Office Open XML standard. It stores data in a compressed ZIP format containing XML files for worksheets and other components.
Background
Introduced with Microsoft Office 2007, the XLSX format replaced the older XLS format, providing better data management and reduced file sizes through XML-based storage. XLSX files are commonly used in business, education, and personal finance for tasks such as budgeting, data analysis, and reporting. The format supports advanced features like pivot tables, charts, and complex formulas, making it a versatile tool for data manipulation. Due to its open XML structure, XLSX files can be accessed and manipulated by a variety of software applications beyond Microsoft Excel, enhancing cross-platform compatibility.
Common MIME types: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
Further reading
Authoritative resources for more details on the .XLSX format.
Common .XLSX issues
Formulas return errors
This can occur due to different locale settings or unsupported functions.
- Verify the locale settings in your application.
- Re-enter the formulas manually if necessary.
File won't open
This might happen if the file is corrupted or the application is outdated.
- Try opening the file in another application like Google Sheets.
- Check for updates for your spreadsheet software.
FAQ
Why can't I edit the file?
The file might be in read-only mode; check the file properties or permissions.
Can I convert XLSX to PDF?
Yes, most spreadsheet applications, including Excel, allow you to export or save as PDF.
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