XLSX to XLS Converter
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What is a XLSX file?
XLSX is the default spreadsheet format used by Microsoft Excel since Office 2007. It is based on the Open XML standard and stores data in cells organized by rows and columns.
XLSX files support formulas, charts, formatting, and large data sets. They are widely used for financial modeling, data analysis, and record keeping across industries.
How to open XLSX files
XLSX files can be opened with Microsoft Excel, Google Sheets, LibreOffice Calc, and many other spreadsheet applications. They are the standard format for spreadsheets today.
You can convert XLSX to PDF, CSV, or XLS using AnyConv or via built-in export options in Excel and other tools.
Key facts about XLSX
- Full name: Microsoft Excel Open XML Spreadsheet
- Extension: .xlsx
- MIME type: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
- Developed by: Microsoft
- Initial release: 2007
Useful links and resources
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
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❓ Frequently Asked Questions
- Do I need to register to convert XLSX files?Not at all! You can convert XLSX to XLS without signing up or installing anything.
- Is it safe to convert XLSX to XLS on AnyConv?Absolutely. All XLSX and XLS files are securely handled and automatically deleted after 1 hour. Nobody can access your data.
- Will the quality change after converting XLSX to XLS?We do our best to preserve the original quality during XLSX to XLS conversion. The result is accurate and clean.
- How long does it take to convert XLSX to XLS?Most conversions from XLSX to XLS take just a few seconds — even for larger files.
- Can I upload more than one XLSX file?Yes, batch conversion is supported. You can convert multiple XLSX files to XLS at once — fast and easy.
- What browsers support XLSX to XLS conversion?All modern browsers! Chrome, Firefox, Safari, Edge — AnyConv runs online and supports converting XLSX to XLS on any platform.