The XLS files are used in Microsoft Excel 97 to 2003 for Workbooks, spreadsheet document files. The XLS is Microsoft Excel's proprietary file format for storing its documents. The latest versions of Microsoft Office use XLSX file format. XLSX format uses ZIP compression for smaller file sizes.
Click the «Choose files» button and select the files you want to convert.
Choose «XLSX» as target format. Click «Convert» to start converting files to XLSX. It only takes a few seconds.
Done! Your files are converted to XLSX format. You can download them to your device.
You don't need to download and install any software to convert files to .xlsx format. All conversions take place in the cloud.
Your files are completely safe and accessible only to you. All files will be permanently deleted within 2 hours after conversion.
Convert your xlsx files in 2 clicks. And don't pay anything for it! MiConv XLSX Converter is free for all users.