Fast, secure and free online tool to convert legacy Excel XLS files to modern XLSX format. Preserve all tables, data and formatting. No watermark, no registration required.
Click or drag XLS file to upload
Your XLS has been converted to XLSX successfully.
Our free XLS to XLSX converter helps you convert older Excel XLS spreadsheets into modern XLSX format quickly and easily. Upgraded XLSX files are perfect for editing in the latest Microsoft Excel, data analysis, sharing, printing and archiving while keeping your original spreadsheet tables, data and layout intact.