XLS to XLSX

Convert online and free XLS to XLSX

Free: up to 750 MB per file (Premium: 20 GB)

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convert .xls to . xlsx

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How to convert XLS to XLSX online?

Upload XLS file Choose your XLS file with the "Choose File" Button, Drag & Drop or import it directly from Dropbox/Google Drive.
Choose target filetype XLSX is set as default target format. Change it if you need a different target filetype for your conversion.
Start Conversion Click "Start Converting!". Most files process in seconds, only the largest files may take a few minutes.
Download your XLSX file Download your finished XLSX file. Your files will be automatically deleted from our servers.

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Currently we support the following conversions with XLS files:

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Information about the extensions for the conversion from XLS to XLSX

From: XLS

XLS is a file format used for spreadsheets created in Microsoft Excel and related applications. It has been an industry standard format for many years, and can be created using many different spreadsheet software products. A typical file will consist …

File extension: .xls
More information and converters for XLS

To: XLSX

XLSX is the file extension of Microsoft's most widely used Excel spreadsheet program. The format has been the successor of the XLS format since 2003. For editing, formulas or formatting commands are entered in the specified table cells, and macr …

File extension: .xlsx
More information and converters for XLSX

Video-Tutorial: XLS to XLSX

File-Converter-Online.com is a service for converting files online from one type to another. We take care of your privacy and take care of your files. As a part of this, there's no registration required on file-converter-online.com. As we're offering our service in a browser, it doesn't matter whether you use Windows, Apple OS X or Linux. Your conversion results will always be at the same, very high quality and of course, without watermarks.