Free Online Converter
Convert XLS to XLSX Online — Upgrade Your Spreadsheets
Modernise old .xls files to the current .xlsx format for full compatibility with Microsoft Excel 2007+, Google Sheets, and modern data tools.
Convert XLS to Excel NowNo sign-up required · Files deleted after conversion · 100% browser-based
How to Convert XLS to Excel
1
Upload your file
Select or drag & drop your XLS file
2
Choose format
Select Excel as the output format
3
Download result
Click Convert and download your file instantly
Why Use Converal?
Works in any browser — no software installation
Files are processed securely and deleted after download
Free to use with no watermarks on your files
Supports 50+ conversion formats in one place
Fast server-side processing — results in seconds
Mobile-friendly — convert on any device
Frequently Asked Questions
Why upgrade XLS to XLSX?
XLSX supports more rows, is smaller in size, and is better supported by modern tools. It also removes the 65,536-row limit of old XLS files.
Will my formulas still work after conversion?
Yes. All formulas and cell references are preserved and remain functional in the converted XLSX file.
Can I open the XLSX in Google Sheets?
Absolutely. Google Sheets natively opens and edits XLSX files, so you can collaborate online after converting.
Ready to convert your XLS file?
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