XLS to XLSX Online Converter

Convert your XLS file to XLSX format in simple 3 clicks.

Step 1 - Select a file(s) to convert
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Step 2 - Convert your files to
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Step 3 - Start converting
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Your file will be uploaded to DigitalOfficePro storage. By using this service, you agree to the DigitalOfficePro Terms of Use.

Convert your XLS File to XLSX Format

Our free XLS to XLSX online converter is the easiest way to convert XLS files to XLSX format. The best online web-based app to transform XLS's into high-quality XLSX format within seconds. No file size limit and no registration or login required. Choose your XLS file, click convert, then download your converted file without the burden of installing additional software on your PC. Our free online XLS to XLSX converter is 100% secure and super fast and also works on all computers and mobile devices with active internet access - regardless of the operating system you have.

XLS
  • File extension
  • .xls
  • Category
  • DOCUMENT
  • Description
  • Actions
  • XLS Converter
  • Technical Details
  • Associated programs
  • Microsoft Excel,Microsoft Excel Viewer,OpenOffice
  • Developed by
  • Microsoft
  • MIME type
  • application/vnd.ms-excel
XLSX
  • File extension
  • .xlsx
  • Category
  • DOCUMENT
  • Description
  • Actions
  • XLSX Converter
  • Technical Details
  • Associated programs
  • Microsoft Excel 2007,Open Office,Oxygen Office Progessional (Linux)
  • Developed by
  • Microsoft
  • MIME type
  • application/vnd.openxmlformats-officedocument.spreadsheetml.sheet

Free XLS File Conversion Tools

Free for Everyone

Our online service is absolutely FREE! There are no hidden costs, and you can convert as many files as you like. No need to download or install additional apps or extensions on your computer.

100% Secure

Your content is never stored on our servers. Files are automatically deleted from our servers immediately after the conversion process. We guarantee your file's security and privacy.

High-Speed Conversion

Your files are processed using our powerful conversion servers. In most cases, the conversion takes less time than it would if you used your own computer.

No Limitations

Unlike other services, our platform imposes no limits on the number of files you can convert. Convert as many as you want—no registration or login required.

Quality Output

We use high-quality conversion algorithms to ensure that you won't lose quality during the file conversion process. Your converted output file retains the same quality and effects as the original file.

Support 100+ Formats

We support over 200 file formats, more than any other online converter. From documents and images to videos, audio files, and eBooks, our service has you covered—and we’re continuously adding more formats.