Office Open XML Spreadsheet
XLSX is the default format for Microsoft Excel spreadsheets. It supports complex formulas, charts, pivot tables, and large datasets. It's the industry standard for data analysis and financial modeling.
MIME type
application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
Developer
Microsoft
Introduced
2007
XLSX is a ZIP-compressed package of XML files following OOXML standard. It contains worksheets, shared strings, styles, and calculation chains. Supports up to 1,048,576 rows and 16,384 columns.
12 conversion options available
12 formats can be converted to XLSX
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Start converting — it's freePortable Document Format
Office Open XML Document
Microsoft Word Document (Legacy)
Plain Text File
Microsoft Excel Spreadsheet (Legacy)
Comma-Separated Values
Office Open XML Presentation
Microsoft PowerPoint Presentation (Legacy)
Open Document Text
Rich Text Format
HyperText Markup Language
Electronic Publication