Sample Files
Details
XLSX
Microsoft Excel Spreadsheet
About
What is .XLSX?
.xlsx is the default spreadsheet file format for Microsoft Excel. It is an XML-based, compressed container that stores worksheets, formulas, charts, tables, styles, and data. XLSX is widely used for financial reports, data analysis, scientific computation, business modeling, and database exports.
History
Origin of XLSX
The file format was introduced by Microsoft in 2007 as part of the Office Open XML (OOXML) specification. It replaced the older binary Excel format, offering improved transparency, reduced corruption risk, smaller file sizes, and better cross-platform interoperability. XLSX files are ZIP-based packages containing XML definitions for worksheets, formulas, styles, relationships, and metadata. The format is standardized as ECMA-376 and ISO/IEC 29500, making it widely supported across spreadsheet editors and programming libraries.
Learn more at: https://www.microsoft.com
Benefits
Smaller and more efficient than the older XLS binary format
Open XML structure improves compatibility and long-term accessibility
Supports complex formulas, charts, pivot tables, and conditional formatting
Cross-platform support on Windows, macOS, Linux, and the web
Easily parsed or generated by many programming libraries
Usage
Open or edit using Microsoft Excel on Windows or macOS
Use Google Sheets or Excel for the Web for online editing and collaboration
Import XLSX files into data tools like Python Pandas, R, or SQL databases
Export spreadsheets from applications or forms to share structured data
Convert XLSX to CSV, PDF, or XLS using Excel or programming libraries
Use Cases
Common Use Cases
Here are the use cases for this file extension
Business & Financial Reporting
Used for budgets, forecasts, accounting sheets, and KPI dashboards.
Data Analysis & Modeling
Popular for formulas, charts, pivot tables, and scenario analysis.
Data Exchange & Automation
Widely used in APIs, ETL pipelines, and automation scripts for structured data export.
Compatibility
Supported By
This extension is compatible with the following platforms.
Windows (native Excel support)
macOS (native Excel support)
Linux (LibreOffice, OnlyOffice)
Android (Excel Mobile, Google Sheets)
iOS / iPadOS (Excel Mobile, Numbers)
Web Browsers (Excel Online, Google Sheets)
More Details
Technical Specs
Here are some technical details about this extension
File Extension
.xlsx
MIME Type
application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
Container Format
ZIP package using Office Open XML
Internal Structure
XML files for worksheets, shared strings, styles, formulas, metadata
Data Types
Numbers, strings, dates, booleans, formulas
Feature Support
Charts, pivot tables, conditional formatting, data validation
Metadata Support
Yes (document properties, revisions, custom metadata)
Typical Use
Spreadsheets, reports, dashboards, analytics, data storage
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Got Questions?
Get answers to common questions
Yes. XLSX can be opened using Google Sheets, LibreOffice Calc, or Excel Online in any modern web browser.
XLSX files can be exported to CSV, PDF, XLS, or HTML using Excel, or converted programmatically using tools like Python Pandas.