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XLS to XLSX converter

Convert XLS to XLSX online from any device with a free converter.

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We have already processed 4,118,562 files with total size of 6,304,344 Mbytes

About Conversion app

Convert your XLS files online. You can convert your XLS documents from any platform (Windows, Linux, macOS). No registration needed. Just drag and drop your XLS file on upload form, choose the desired output format and click convert button. Once conversion completed you can download your XLSX file.

You even can perform more advanced conversions. For example you can convert password protected documents. Just expand LoadOptions and enter the password of your file. Or you can add a watermark to the converted XLSX file. Expand the ConvertOptions and fill the fields for watermarking.

You can convert your XLS documents from anywhere, from any machine or even from a mobile device. The XLS converter is always available online and is completely free.

  • Convert WORD to PDF, EXCEL to PDF, PDF to WORD, POWERPOINT to IMAGE, VSDX to PDF, HTML to DOCX,EPUB to PDF, RTF to DOCX, XPS to PDF, ODT to DOCX, ODP to PPTX and many more document formats
  • Simple way to instant convert XLS to XLSX
  • Convert XLS from anywhere - it works on all platforms including Windows, MacOS, Android and iOS
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APIs available

Convert popular document and image file formats in your app. The GroupDocs.Conversion APIs are available for .NET, Java, and many other platforms and languages.

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How it works

How to convert XLS to XLSX

Step 1
Click inside the file drop area to upload XLS file or drag & drop XLS file.
Step 2
Click on Convert button. Your XLS files will be uploaded and converted to XLSX result format.
Step 3
Download link of result files will be available instantly after conversion.
Step 4
You can also send a link to the XLSX file to your email address.
FAQ

Questions & Answers

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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Other Supported Conversions

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

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