Convert EXCEL to XLSX

Understanding Excel and XLSX file formats

Excel is a general term referring to files created by Microsoft Excel, a popular spreadsheet application. Historically, Excel files used the .xls extension, which is a proprietary binary format. In 2007, Microsoft introduced the XLSX format, an open XML-based standard that offers better data management, reduced file size, and improved compatibility with other software.

Why convert Excel files to XLSX?

Converting older .xls files to .xlsx ensures better compatibility with modern software, improved security, and access to newer Excel features. The XLSX format is also less prone to corruption and is supported by a wider range of applications, including cloud-based tools.

How to convert Excel files to XLSX

The most straightforward way to convert an Excel file to XLSX is by using Microsoft Excel itself. Here’s how:

• Open your .xls file in Microsoft Excel.
• Go to File → Save As.
• In the Save as type dropdown, select Excel Workbook (*.xlsx).
• Click Save.

Best software for Excel to XLSX conversion

Microsoft Excel is the most reliable tool for converting Excel files to XLSX, as it preserves formatting, formulas, and macros. For users without Excel, LibreOffice Calc is a free alternative that can open .xls files and save them as .xlsx via File → Save As.

Online converters like Zamzar or CloudConvert also offer quick conversion without installing software, but may have file size limits and privacy considerations.

Tips for a successful conversion

• Always back up your original file before converting.
• Check the converted file for formatting or data issues, especially with complex spreadsheets.
• Use the latest version of your chosen software for best compatibility.