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.XLSX File Extension

File TypeMicrosoft Excel Open XML Spreadsheet

3.9 (668 Votes)
CategorySpreadsheet Files

What is an XLSX file?

An XLSX file is an Excel spreadsheet created by Microsoft Excel or another spreadsheet program, such as OpenOffice Calc or Apple Numbers. It stores data in worksheets, which contain cells arranged in a grid of rows and columns, and may also contain charts, mathematical functions, styles, and formatting. XLSX files are commonly used to store financial data and to create simple or complex mathematical models.

More Information

Screenshot of a .xlsx file in Microsoft Excel 2019

XLSX file open in Microsoft Excel 2019

XLSX files are created using the Open XML standard, which was introduced in Microsoft Office 2007. They are stored as a compressed Zip archive, which contains a collection of individual files. The archive includes the file [Content_Types].xml, which describes the spreadsheet, and an XML file for each worksheet within the spreadsheet.

Each cell in an XLSX spreadsheet may be formatted individually. For example, cells may have a number, text, currency, or another format, as well as color, border style, custom font, and size. Cells may also reference other cells to compute a resulting value.

NOTE: XLSX files can be opened in Excel 2007 or later. They are also backward compatible with earlier versions of Excel via Open XML component support.

Common XLSX Filenames

Workbook1.xlsx - The default filename Microsoft Excel gives to new workbooks beginning with Excel 2007.

Open and view .XLSX files with File Viewer Plus.
Programs that open XLSX files
Updated 8/1/2019

About XLSX Files

Our goal is to help you understand what a file with a *.xlsx suffix is and how to open it.

The Microsoft Excel Open XML Spreadsheet file type, file format description, and Mac, Windows, Linux, Android, and iOS programs listed on this page have been individually researched and verified by the FileInfo team. We strive for 100% accuracy and only publish information about file formats that we have tested and validated.

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