Convert XLS to XLSX
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You have the option to convert your xls file to xlsx, as well as a variety of other formats, using our free online converter.
Converting your xls file to xlsx is easy with these steps.
Converting your xlsx file to xls is easy with these steps.
Step 1
Upload xls-file
You can select xls file you want to convert from your computer, Google Drive, Dropbox or simply drag and drop it onto the page.
Step 2
Select «to xlsx»
Choose xlsx or any of the other 200+ supported formats you'd like to convert to.
Step 3
Download your xlsx file
Please wait for the conversion to complete, then click on the download button to obtain your converted file in the xlsx format.
Converting xls to xlsx
Fast and easy
Simply drag and drop your xls files onto the webpage, and you'll be able to convert them to xlsx or over 250 different file formats, all without having to register, provide an email address, or include a watermark.
You don't need to worry about security.
As soon as you upload your xls 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.
Everything is stored in the cloud.
You don't have to go through the hassle of installing any software. We handle all xls to xlsx conversions in the cloud, which means that none of your computer's resources will be used in the process.
Microsoft Excel Binary File Format
| Extension | .xls |
| Category | 🔵 documents |
| Programs | 🔵 Microsoft Office 🔵 LibreOffice 🔵 Kingsoft Office 🔵 Google Docs |
| Main program | 🔵 Microsoft Office |
| Description | 🔵 XLS – is a spreadsheet created by a popular Microsoft Excel application. It includes document data that is located in cells that have a specific address. They can contain formulas, mathematical equations associated with the information in other cells, and fixed information. It is often used for the development of graphs and charts. The format allows us to store and edit a broad range of parameters - images, tables, macros, types, diagrams. It has been widely used until the appearance of the 2007 version of Excel, and then it was replaced with the XMLSS extension. The information inside the XLS document is contained in a series of static-size streams. Their location is described using several segment distribution tables. It differs in backward compatibility and supports various file formats created for DOS. It is often used by web browsers to exclude the use of binary formats. The utility is included in the Microsoft Office suite and, in addition to Excel, can be opened by various applications like Apache Open Office, Libre Office, adapted to Mac OS, Windows, or Linux. |
| Technical details | 🔵 The format's relevance is explained by its simplicity, although it does not support separate functions, for example, storing VBA macros. Until XMLSS appeared, the Excel application used the Biff extension when formatting, created based on the IFF container format. Due to this, changes to the book templates and their contents were available. After introducing the new format in 2007, the program has not lost the backward compatible properties, which guarantees the wide distribution of XLS in the future. Subsequently, the XLS extension was replaced by the XLSM, XLSB, and XLSX formats. |
| Developer | 🔵 Microsoft |
| MIME type | 🔵 application/vnd.ms-excel |
Office Open XML Document
| Extension | .xlsx |
| Category | 🔵 documents |
| Programs | 🔵 Microsoft Office 🔵 LibreOffice 🔵 Kingsoft Office 🔵 Google Docs |
| Main program | 🔵 Microsoft Office |
| Description | 🔵 XLSX – is an e-book created with one of the versions of the Excel program older than 2007. Thus the data have the form of tables consisting of columns and lines. Each table is divided into cells with a unique address, consisting of numeric and alphabetic characters. Cells contain data, both manually entered, and information that was obtained as a result of calculations. The extension allows the use of images, diagrams, and graphic information. XLSX files are formatted based on the Open XML standard, which will enable you to compress data by the type of ZIP. The archive contains a file for describing the table and individual files for each of its worksheets. The format makes it possible to develop and edit complex multi-sheet spreadsheets with various formulas and data sources. |
| Technical details | 🔵 Using the XLSX extension helps to optimize the file's content, the technology of managing, and restoring information. The format significantly increases the capabilities of binary files of obsolete Excel program variants. All applications that display XML can work correctly with the XLSX extension. Due to the preservation of data in XML format, reliable data storage is provided. This allows you to transfer files over local networks seamlessly. |
| Developer | 🔵 Microsoft |
| MIME type | 🔵 application/vnd.openxmlformats-officedocument.spreadsheetml.sheet |
FAQ
❓ How do I change xls to xlsx?
To get started, either pick a file you want to convert from xls 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 xls to xlsx?
Typically, image conversions only take a few seconds, so you can expect a speedy conversion when changing xls to xlsx.
🛡️ Can I trust OnlineConvertFree to convert xls to xlsx 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 xls to xlsx, are 100% safe on OnlineConvertFree.
📱 Is it possible to convert xls to xlsx 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 xls to xlsx, on your computer or mobile device, completely online.