Drop file here. 150 MB maximum file size.
An XLSX file is a spreadsheet created by Microsoft Excel or another spreadsheet program, such as OpenOffice Calc or Apple Numbers. Data are stored in worksheets, which contain cells arranged in a grid of rows and columns, and may also contain tables, mathematical functions, styles and formatting. XLSX files are commonly used to store financial data and backup simple or complex mathematical models.
An XLS file is a spreadsheet created by Microsoft Excel or another spreadsheet program, such as OpenOffice Calc or Apple Numbers. This contains one or more worksheets, which store and display the data as a table. They can also store mathematical functions, graphics, styles and formats.
Access powerful and secure free online XLSX tools to convert, view, edit, merge, split, and compare XLSX files β all without installing any software. Our tools support the .XLSX (Microsoft Excel Open XML Spreadsheet) file extension and run smoothly in any modern browser.
Select a tool below to explore features and manage your XLSX files directly from your device with ease.
Chose or drag & drop your XLSX file, click Convert to XLS, and download the XLS file. No registration needed.
Yes, all uploads are encrypted. Your files are auto-deleted after 24 hours.
Yes, our converter retains layout, fonts, and images as accurately as possible.
Fileproinfo converter engine works fast. You can convert XLSX to XLS in a few seconds to couple of minutes for large size files with complex structure.
FileProInfo support manay file formats that allow you to convert XLSX to 100s of file formats, without any limit, registration and downloading, 100% free and online XLSX converter.
All converters in this list are manually verified & 100% free and working properly, however you must use these apps according to their respective terms & conditions.
This tool and page updated at: 12-Apr-2025
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Listed file converters are from the wide range of online file converter.
These are the most polular file/document converters based on the user's review and usage on the FileProInfo.