Convert XLS to XLTX
No Signup required, Convert and Download High Qulity XLTX and use anywhere
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Drag & drop up to 10 files here, or click to select files.
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XLS to XLTX Overview
Our free tool allows you to convert Excel files into a variety of formats, offering maximum flexibility for your document conversion needs. It's fully online and compatible with multiple platforms, including Mac OS, Linux, Android, iOS, and more.
How to Convert XLS Files to XLTX
Upload Your Files: Select the Excel files you want to convert and upload them to the website.
Start Conversion: Hit the "Convert" button to initiate the process.
Download: You can immediately download your converted files
File Deletion Notice: Please note that files are automatically deleted from our servers after 24 hours, and download links become inactive after this time.
Key Advantages - XLS to XLTX
No Signup Required
Enjoy hassle-free usage with no sign-up needed. Works smoothly across platforms, including Windows, Mac, iOS, and Android.
Batch File Conversion
Easily convert multiple Excel spreadsheets in one go—upload up to 10 files at a time.
Data Privacy and Security
Your data is secured using advanced encryption methods and is never used for any other purposes. All files are permanently deleted after 24 hours.
Top-Tier, Commercial-Grade Quality
Our conversion algorithms are built with commercial-grade technology, ensuring flawless results even with complex Excel elements like charts and formatting. Although the conversion process is simple for you, our backend is carefully designed to deliver results comparable to leading commercial solutions. Each detail is carefully managed to ensure a premium quality experience.
What is XLTX?
XLTX is a file format used by Microsoft Excel to save template files. It is an XML-based template format that allows users to create Excel files with pre-defined formatting, formulas, and styles which can be reused for future spreadsheets, enhancing productivity and consistency.
Loss of Macros
XLTX files do not support macros, which means any Excel templates that rely on VBA code will lose this functionality when converted to XLTX.
Compatibility Issues
Some features or formatting from older versions of Excel may not translate properly into the XLTX format, especially if the original file uses functions or formatting that are not supported in the newer XML-based structure.
Inability to Save as a Binary File
When converting to XLTX, users cannot save files in a binary format (XLTX), which can limit performance with large datasets because file sizes may increase.
Loss of External Links
External links to other workbooks or data sources may break during conversion, leading to errors or missing data in the template after saving it as XLTX.
What are the differences between XLSX and XLS?
File Format
XLSX is the modern file format used by Microsoft Excel, introduced with Excel 2007, and is based on the Open XML standard. In contrast, XLS is the older binary file format used by earlier versions of Excel up to 2003.
File Size
XLSX files are generally smaller in size compared to XLS files because they use Zipping compression, making it more efficient for storage and sharing.
Data Capacity
XLSX supports a significantly larger amount of data, allowing for up to 1,048,576 rows and 16,384 columns per worksheet, while XLS is limited to 65,536 rows and 256 columns.
Features and Functions
XLSX files support newer features and functions available in Excel 2007 and later versions, such as improved charting tools, Sparklines, and enhanced formulas. XLS files do not have access to these advanced features.