Free online XLS to XLSX converter

Convert XLS to XLSX online from any device, with a modern browser like Chrome, Opera and Firefox.

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Aspose.Cells for .NET Aspose.Cells Excel Conversion

 

Aspose Excel converter is a free app to convert Excel format, also you can save the result to PDF, XLS, XLSX, XLSM, XLSB, ODS, CSV, TSV, HTML, JPG, BMP, PNG, EMF, WMF, SVG, TIFF, XPS, MHTML and Markdown. Convert Excel online from Mac OS, Linux, Android, iOs, and anywhere.

If you want to convert programmatically please check Aspose.Cells documentation.

Aspose.Cells

XLS Microsoft Excel Binary File Format

Files with XLS extension represent Excel Binary File Format. Such files can be created by Microsoft Excel as well as other similar spreadsheet programs such as OpenOffice Calc or Apple Numbers. File saved by Excel are known as Workbook where each workbook can have one or more worksheets. Data is stored and displayed to users in table format in worksheet and can span numeric values, text data, formulas, external data connections, images and charts.

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XLSX Microsoft Excel Open XML Spreadsheet

XLSX is well-known format for Microsoft Excel documents that was introduced by Microsoft with the release of Microsoft Office 2007. Based on structure organized according to the Open Packaging Conventions as outlined in Part 2 of the OOXML standard ECMA-376, the new format is a zip package that contains a number of XML files. The underlying structure and files can be examined by simply unzipping the .xlsx file.

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How to convert XLS to XLSX

  • Click inside the file drop area to upload XLS files or drag & drop XLS files.
  • You can upload maximum 10 files for the operation.
  • Your XLS files will be uploaded and will be converted to XLSX format.
  • Download link of XLSX files will be available instantly after conversion.
  • You can also send a link to the XLS file to your email address.
  • Note that file will be deleted from our servers after 24 hours and download links will stop working after this time period.

Other Supported Conversions

You can also convert XLS into many other file formats. Please see the complete list below.