Excel to XLSX Converter — Free Online Tool
Upgrade legacy Excel XLS files to the modern XLSX format. Upload your .xls file and download a clean .xlsx workbook compatible with Excel 2007+, Google Sheets, and LibreOffice.
Convert in Three Steps
The whole process takes under a minute, even for large files.
Upload your file
Drag and drop or click to browse. SQL, SQLite, CSV and JSON files up to 50 MB are accepted.
Pick your target
Select the output format. The source format is detected automatically from your file.
Download the result
Your converted file is ready in seconds. Import it directly into your database.
Every Syntax Difference Handled Automatically
XLS is the legacy Excel format from Excel 97-2003. While modern tools can still open XLS files, the XLSX format is smaller, faster, and more compatible with modern applications. Converting to XLSX ensures your spreadsheets work correctly in Google Sheets, LibreOffice, and all modern Excel versions.
Our converter reads your XLS file and outputs a clean XLSX workbook with all data preserved. Formulas are evaluated and their results are exported as values.
Related Conversions
Other conversions you might need alongside Excel to XLSX.
Common Questions
XLS is the legacy binary format (Excel 97-2003). XLSX is the modern XML-based format (Excel 2007+). XLSX is smaller, faster, and more compatible.
Formula results are exported as values. The formulas themselves are not included in the output.
Macros are not included in the XLSX output. Use .xlsm format if you need macros.
Related Conversions
Ready to Convert Your Excel to XLSX File?
Upload your file above and get a converted result in under a minute. No account, no cost, no catch.