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XLSX

Microsoft Excel Open XML Spreadsheet

MIME type: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet

XLSX is the default file format for Microsoft Excel spreadsheets since Office 2007. It stores data, formulas, charts, and formatting in a ZIP-compressed XML container.

Advantages

+Industry standard for spreadsheets
+Supports formulas, charts, macros
+Smaller than XLS (ZIP compressed)
+Compatible with Google Sheets, LibreOffice

Limitations

-Binary content can be hard to diff/merge
-Macro-enabled versions (.xlsm) can be security risks
-Complex for simple data (use CSV instead)
-Proprietary format specification

Common Use Cases

Financial reports and budgetsData analysis and modelingBusiness reportingInventory tracking

Technical Details

XLSX files are ZIP archives containing XML files. Worksheet data is in xl/worksheets/sheet1.xml with shared strings in xl/sharedStrings.xml. Cell values, formulas, and formatting are stored separately for efficiency.

Frequently Asked Questions

What is an XLSX file?

XLSX is Microsoft Excel's default spreadsheet format since 2007. It's a ZIP archive containing XML files with your data, formulas, charts, and formatting.

How do I convert XLSX to CSV?

Open the file in Excel or Google Sheets and export as CSV. For bulk conversion, use BriskTool's conversion tools.

Related Tools

Json To Csv

Related Formats

CSV PDF DOCX

Compare XLSX with...

XLSX vs CSV XLSX vs PDF XLSX vs DOCX