XLSX Dummy File
Microsoft Excel spreadsheet format for data and calculations.
Click to download — no generation needed, files are ready instantly.
About XLSX Files
XLSX is the default file format for Microsoft Excel spreadsheets since Office 2007. Like DOCX, it is based on the Office Open XML standard and is stored as a ZIP archive containing XML files. The format superseded the older binary XLS format and brought improvements in file size, data capacity, and openness.
Excel spreadsheets are indispensable in business, finance, science, and engineering for data analysis, financial modeling, project management, and reporting. XLSX supports up to 1,048,576 rows and 16,384 columns per worksheet, multiple sheets per workbook, complex formulas, pivot tables, charts, conditional formatting, and macros (stored in XLSM variant). The format is supported by virtually all modern spreadsheet applications.
Programmatically, XLSX files can be created and manipulated using libraries like openpyxl and xlsxwriter in Python, Apache POI in Java, or SheetJS (xlsx) in JavaScript. The internal XML structure separates shared strings, styles, and worksheet data into distinct components, allowing efficient reading and writing of large datasets.
Frequently Asked Questions
What is an XLSX file?
An XLSX file is a Microsoft Excel spreadsheet in the Office Open XML format. It stores data in rows and columns across one or more worksheets, supporting formulas, charts, and rich formatting.
How to open XLSX without Microsoft Excel?
XLSX files can be opened with LibreOffice Calc (free), Google Sheets (online), Apple Numbers on Mac/iOS, and WPS Spreadsheets. All support the format with good compatibility.
What is the row limit in XLSX?
An XLSX workbook supports up to 1,048,576 rows and 16,384 columns (XFD) per worksheet. This is a significant increase from the older XLS format which was limited to 65,536 rows.
What is the difference between XLSX and CSV?
XLSX is a rich binary format supporting multiple sheets, formatting, formulas, and charts. CSV is a plain text format with just comma-separated values — simpler, smaller, and universally compatible but with no formatting or formulas.