Groupdocs logo
  1. GroupDocs Products
  2. Conversion App
  3. Convert XLS to XLTX

XLS to XLTX converter

Convert XLS to XLTX online from any device with a free converter.

Powered by groupdocs.com and groupdocs.cloud.

drop files here

By uploading your files or using our service you agree with our Terms of Service and Privacy Policy.

We have already processed 5,836,054 files with total size of 9,543,609 Mbytes

About Spreadsheet converter

Convert XLS to XLTX files online with our free spreadsheet converter. Whether you're on Windows 10, Mac, Android or iPhone, converting XLS files is quick and easy.

Spreadsheet file formats like XLSX, XLS, ODS, and CSV are commonly used for organizing and analyzing data. XLSX and XLS are associated with Microsoft Excel and support advanced features, CSV is a simpler format, storing data as plain text. Popular applications for working with tables include Microsoft Excel, Google Sheets, and Apple Numbers.

To change XLS to XLTX just drop your file onto the upload form, pick the output format and hit the Convert button. After the conversion is finished, download your XLTX file instantly. No email needed.

Check our video
XLS

Microsoft Excel Binary File Format

The XLS file format is a binary file format used by Microsoft Excel to store spreadsheet data, including text, numbers, formulas, and formatting. It is supported by various spreadsheet applications like Microsoft Excel, LibreOffice Calc, and Apache OpenOffice, as well as online tools like Google Sheets. The format organizes data into worksheets with rows and columns, supports advanced features like macros, charts, and conditional formatting, and is part of the broader Excel ecosystem, though it has been largely replaced by the XML-based XLSX format.

XLTX

Microsoft Excel Open XML Template

XLTX is a file format used for Excel Open XML Spreadsheet Templates, designed to store pre-formatted spreadsheet layouts for creating consistent and reusable Excel documents. It is supported by Microsoft Excel, LibreOffice Calc, and other spreadsheet applications, enabling users to create, edit, and share templates across platforms. The format is based on XML and ZIP compression, allowing for structured data storage, advanced formatting, and customization options such as formulas, styles, and macros.

Add the conversion API to your app

  • Convert over 200 file formats — including PDF, Word, Excel, HTML, images, and many more
  • Load files from disk, URLs, FTP servers, or cloud storage (such as Amazon S3 or Azure)
  • Customize output settings — rotate and reorder pages, add comments, or apply watermarks
How it works

How to convert XLS to XLTX

Step 1
Click inside the file drop area to upload XLS file or drag & drop XLS file.
Step 2
Click on Convert button. Your XLS files will be uploaded and converted to XLTX result format.
Step 3
Download link of result files will be available instantly after conversion.
Step 4
You can also send a link to the XLTX file to your email address.
FAQ

Questions & Answers

Other Supported Conversions

You can also convert XLS into many other file formats. Please see the complete list below.

© Aspose Pty Ltd 2001-2025. All Rights Reserved.
More apps

Upgrade to Premium

The application usage limit reached.
Upgrade for extended access, starting at $4/month.
Upgrade Learn more