Online XLS Converter

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What is a XLS file?

XLS is the proprietary spreadsheet format used by Microsoft Excel prior to the introduction of XLSX in 2007. It uses a binary file structure and supports formulas, charts, macros, and formatting.

XLS files remain widely compatible and are still used in many organizations. However, XLSX offers better performance and security.

How to open XLS files

XLS files can be opened using Microsoft Excel, Google Sheets, LibreOffice Calc, and other spreadsheet applications. They support charts, formulas, and formatting.

To ensure compatibility and security, convert XLS to XLSX or ODS using AnyConv or within Excel itself.

Key facts about XLS

  • Full name: Microsoft Excel Binary File Format
  • Extension: .xls
  • MIME type: application/vnd.ms-excel
  • Developed by: Microsoft
  • Initial release: 1987

Useful links and resources

🎯 Did You Know?

XLS could hide more than just numbers
Due to its binary structure, XLS files were historically a common target for macro viruses — tiny programs embedded in spreadsheets. That’s one of the reasons why Microsoft introduced the more secure XLSX format with macro-free defaults.
— Fact picked by

❓ Frequently Asked Questions

Answers to common questions about XLS
  • Do I need to install software to convert XLS files?
    No extra software is required. Just upload your XLS files to AnyConv, we’ll convert them on our servers, and you can download the finished file right away.
  • Can I use XLS converter on my phone or tablet?
    Yes, you can convert XLS files on any device — including phones and tablets. AnyConv works perfectly on mobile.
  • Is it safe to convert XLS files with AnyConv?
    Yes, converting XLS files with AnyConv is secure. All files are automatically deleted after conversion and never shared.
  • Can I convert multiple XLS files at once?
    Yes, our converter supports batch processing. You can upload several XLS files and convert them all at once.