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Convert XLSX to XLS

You have the option to convert your xlsx file to xls, as well as a variety of other formats, using our free online converter.

How to convert xlsx to xls?

How to convert xls to xlsx?

Step 1

Upload xlsx-file

You can select xlsx file you want to convert from your computer, Google Drive, Dropbox or simply drag and drop it onto the page.
Step 2

Select «to xls»

Choose xls or any of the other 200+ supported formats you'd like to convert to.
Step 3

Download your xls file

Please wait for the conversion to complete, then click on the download button to obtain your converted file in the xls format.

The security of your files is our priority

Understanding the importance of the security of our users' data, we have implemented a number of measures to ensure reliable file conversion without the risk of information leakage or privacy violations.

Data encryption

All information uploaded to our platform is SSL encrypted, ensuring privacy during transmission.

Safe storage

After the conversion is completed, the files are stored on secure servers for 24 hours and are automatically destroyed, excluding access by third parties.

Harmless scripts

Our file conversion tools are regularly tested for malicious code or vulnerabilities to eliminate the risk of a potential cyber attack.

Best tool to convert xlsx to xls

xlsx to xls Fast and easy

Simply drag and drop your xlsx files onto the webpage, and you'll be able to convert them to xls or over 250 different file formats, all without having to register, provide an email address, or include a watermark.

Secure xlsx to xls Conversion

As soon as you upload your xlsx files, we instantly delete them. Converted files are then deleted after 24 hours. Furthermore, we ensure that all file transfers are secure through advanced SSL encryption.

No Software Installation Required

You don't have to go through the hassle of installing any software. We handle all xlsx to xls conversions in the cloud, which means that none of your computer's resources will be used in the process.

Office Open XML Document

Extension.xlsx
Category🔵 documents
Programs
🔵 Microsoft Office
🔵 LibreOffice
🔵 Kingsoft Office
🔵 Google Docs
Main program🔵 Microsoft Office
Description🔵 .xlsx (Microsoft Excel Open XML Spreadsheet) The .xlsx format is the default file format for spreadsheets created in Microsoft Excel, starting with Excel 2007 and later versions. It is part of the Office Open XML specification and utilizes XML and ZIP compression to reduce file sizes. The .xlsx format is capable of handling complex spreadsheets with data, formulas, charts, pivot tables, and various formatting options. It is more efficient and secure compared to the older .xls format and is commonly used in business, education, and personal data management.
Technical details🔵 Introduced in Excel 2007 as part of the Office Open XML (OOXML) standard, the `.xlsx` format represents a significant advancement from the older `.xls` format. It utilizes XML within a ZIP archive structure to enhance data readability and efficiently organize elements such as worksheets and shared strings. This format can handle extensive datasets, supporting up to 1,048,576 rows and 16,384 columns per sheet. Additionally, it includes advanced features like formulas, charts, pivot tables, and VBA macros. The use of shared XML files helps optimize file size. `.xlsx` promotes cross-platform interoperability, integrates security features such as digital signatures and encryption, and even offers a macro-enabled `.xlsm`
Developer🔵 Microsoft
MIME type
🔵 application/vnd.openxmlformats-officedocument.spreadsheetml.sheet

Microsoft Excel Binary File Format

Extension.xls
Category🔵 documents
Programs
🔵 Microsoft Office
🔵 LibreOffice
🔵 Kingsoft Office
🔵 Google Docs
Main program🔵 Microsoft Office
Description🔵 .xls The .xls format is the default file format for spreadsheets created in Microsoft Excel, particularly in versions before Excel 007. This binary file format can store data in cells organized in rows and columns, and it supports formulas, charts, graphs, and various formatting features to manipulate and visualize dataThe .xls format was commonly used in business, finance, and any field requiring data analysis and presentation but has since been largely replaced by the more advanced .xlsx format.
Technical details🔵 The `.xls` format, primarily for Microsoft Excel versions before 2007, stores spreadsheet elements like worksheets, formulas, and macros. As a proprietary binary format by Microsoft, its undocumented internal structure made third-party software compatibility challenging. This format includes binary records encapsulating data, formatting, and embedded objects, supporting multiple worksheets, various functions, and inter-sheet referencing. `.xls` files may contain Visual Basic for Applications (VBA) macros, enabling automation and complex calculations. It's supported not just in Excel but also in applications like OpenOffice Calc, with options to convert between `.xls` and other formats like `.xlsx`. Despite security concerns with macros, `.xls` is still used, mainly for its compatibility with older Excel versions and legacy systems, although the newer `.xlsx` format, introduced in Office 2007 with XML and ZIP technologies, offers improved efficiency and security.
Developer🔵 Microsoft
MIME type
🔵 application/vnd.ms-excel

FAQs on xlsx to xls Conversion

❓ How do I change xlsx to xls?
To get started, either pick a file you want to convert from xlsx and select it or drag and drop it into the conversion tool. Next, select the desired format that you wish to convert your file to. Once you have selected the format, click the "convert" button and wait for the tool to finish converting your file.
⏳ What is the estimated time it will take to convert xlsx to xls?
Typically, image conversions only take a few seconds, so you can expect a speedy conversion when changing xlsx to xls.
🛡️ Can I trust OnlineConvertFree to convert xlsx to xls securely?
Absolutely! We take your security seriously, and guarantee the protection of your uploaded and converted files. No one will have access to your information since we delete all files once the conversion process is complete. You can trust that all types of conversions, including xlsx to xls, are 100% safe on OnlineConvertFree.
📱 Is it possible to convert xlsx to xls without having to install any software?
Yes, that's right! OnlineConvertFree doesn't require any installation, which means that you can convert any files, including xlsx to xls, on your computer or mobile device, completely online.