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 converts your files for free – no registration, no installation, no watermarks. Works on any device - Windows, macOS, Linux, Android and iOS. The free version supports files up to 750 MB, with Premium up to 20 GB. Our servers are located in Germany, all files are encrypted during transfer and automatically deleted after conversion. Since 2013, we have converted over 128,099,799 files - if you have any questions or issues, you can reach us anytime via the contact form.