Sample Files
Details
XLS
Microsoft Excel Spreadsheet
About
What is .XLS?
.xls is a binary spreadsheet format used by older versions of Microsoft Excel. It stores worksheets, formulas, charts, formatting, macros, and cell data in a proprietary binary structure. XLS remains supported today for compatibility with legacy documents.
History
Origin of XLS
The format is the legacy spreadsheet file type used by Microsoft Excel from Excel 2.0 (1987) through Excel 2003. XLS files are stored using the proprietary binary format known as BIFF (Binary Interchange File Format), and the file itself is wrapped in an OLE Compound File container. Before being replaced in 2007 by the XML-based format as part of the Office Open XML transition, XLS was the industry standard for spreadsheets in business, finance, and data processing.
Learn more at: https://www.microsoft.com
Benefits
Compatible with older versions of Excel (pre-2007)
Supports formulas, charts, formatting, and macros
Common in legacy business and financial systems
Still readable by modern spreadsheet applications
Usage
Open and edit XLS files using Microsoft Excel on Windows or macOS
Open in LibreOffice Calc, Google Sheets (import), or other spreadsheet tools
Convert XLS to XLSX, CSV, or PDF for modern compatibility
Use macros embedded in XLS if required by legacy workflows
Use Cases
Common Use Cases
Here are the use cases for this file extension
Legacy Spreadsheet Archives
Used extensively before 2007, many organizations retain historical XLS documents.
Business Reporting Templates
Older financial models and forms may still require the binary XLS format.
Macro-Enabled Workflows
XLS supports Excel macros (VBA), making it useful for certain automation tasks.
Compatibility
Supported By
This extension is compatible with the following platforms.
Windows (Excel native support)
macOS (Excel, Numbers limited support)
Linux (LibreOffice, OnlyOffice)
Android (Excel Mobile, Google Sheets import)
iOS / iPadOS (Excel Mobile, Numbers)
Web Browsers (Excel Online with conversion)
More Details
Technical Specs
Here are some technical details about this extension
File Extension
.xls
MIME Type
application/vnd.ms-excel
Container Format
OLE Compound File containing BIFF records
Content Structure
Binary records describing worksheets, formulas, formatting, and cell data
Feature Support
Formulas, charts, formatting, macros (VBA), limited rows/columns
Limitations
65,536 rows, 256 columns, no modern XML structure
Typical Use
Legacy spreadsheets, financial models, macro workflows
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Got Questions?
Get answers to common questions
Yes. Modern versions of Microsoft Excel fully support files, though some newer features may not be available when editing them.
You can convert to XLSX, CSV, or PDF using Microsoft Excel, or import it into Google Sheets or LibreOffice Calc.