Convert XLS to XLTX Files Online for Free.
Free online tool to convert xls to xltx files quickly and securely. No installation required – start converting your files in just a few clicks!
Drag and drop your files here or click to upload.
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Maximum file size is 10MB
How It Works
How to Convert XLS to XLTX
Click inside the file drop area to upload your XLS file or drag & drop it.
Select XLTX as the output format and click the 'Convert' button.
Download the converted XLTX file instantly after conversion.
You can also send a link to the converted file via email. (Optional)
Convert Your XLS files to other formats
RunConvert.com can convert your XLS files to these other formats:
Convert Your XLS files to other formats
Convert Files to XLS Format
RunConvert.com supports these converters to XLS format:
Convert Files to XLS Format
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Frequently Asked Questions
Here are some common questions and answers about xls file conversions ask by our users on RunConvert.com.
Frequently Asked Questions
Q: Why does my CSV look weird in Excel?
A: Ah, the classic comma confusion. Sometimes Excel misreads delimiters—especially if your system uses semicolons instead. Try importing the CSV using Excel's 'Data > From Text' feature and set the correct separator.
Q: Can I convert spreadsheets with multiple tabs?
A: Yes, but not all formats support multiple sheets. XLSX and ODS do, but CSV flattens everything into one sheet. If tabs matter, avoid CSV.
Q: Will formulas work after conversion?
A: If you're converting to another spreadsheet format like ODS or XLSX, formulas usually transfer just fine. But CSV or PDF? Not so much—they flatten the data.
Q: What’s a TSV file, and how’s it different from CSV?
A: TSV stands for Tab-Separated Values, while CSV uses commas. They’re pretty similar—just different flavors of the same idea: plain text tables.
Q: Will colors and fonts transfer in my spreadsheet conversion?
A: That depends on the format. Excel to Excel? You’re good. But converting to CSV? Say goodbye to colors, fonts, and anything fancy—it’s just plain text there.
Q: Why use spreadsheet conversion at all?
A: Sometimes you need a lighter file, better compatibility, or just a shareable version. Conversion keeps your data flexible and accessible.
Q: What’s the cleanest format for archiving spreadsheets long term?
A: PDF/A is a solid pick for archiving. If you want something editable, stick with ODS—it’s open and standardized.
Q: Can I edit my spreadsheet after converting it to PDF?
A: Not really. PDFs aren’t built for editing like spreadsheets are. You can annotate or highlight, but serious edits? You’ll need to go back to the spreadsheet.
Q: Do you support spreadsheet conversions in different languages?
A: Totally. RunConvert handles files with characters from all over the world—whether it's French accents or Japanese kanji. Just use UTF-8 encoding!
Q: What’s the best format for mailing spreadsheet data?
A: PDF is best if you don’t want changes. CSV works well for raw data sharing. Just don’t send huge Excel files if you can avoid it.
What is XLS (Excel Spreadsheet)?
XLS (Excel Spreadsheet) is a proprietary file format developed by Microsoft for storing spreadsheet data, including rows, columns, and data cells. The format supports complex data like formulas, charts, and formatting.
XLS files are widely used for business, academic, and personal tasks requiring advanced data analysis, visualization, and reporting.
How to open XLS?
XLS files can be opened using spreadsheet programs like Microsoft Excel, LibreOffice Calc, or Google Sheets. These programs display data in a tabular format, preserving the cell structures, formulas, and formatting.
To open XLS files in Excel or Google Sheets, simply double-click the file or import it into the application.
XLS is Developed by: Microsoft
XLS was Released on: 1985
Useful Links for XLS:
How to convert XLS?
You can convert XLS files to other formats, such as CSV, JSON, or PDF, using online file converters or within spreadsheet programs. Simply upload your XLS file and select the desired output format.
In Microsoft Excel or LibreOffice, you can also save your XLS files in various other formats, like CSV or PDF, for compatibility with different applications.
What is XLTX (Excel Template)?
XLTX (Excel Template) is a file format used by Microsoft Excel to store spreadsheet templates. These templates can include predefined formatting, formulas, and layouts, making it easier to create consistent and professional-looking spreadsheets.
XLTX files are commonly used in business environments for creating standardized financial reports, invoices, and other recurring documents.
How to open XLTX?
XLTX files can be opened using Microsoft Excel or other spreadsheet software that supports the format, such as LibreOffice Calc or Google Sheets.
For editing, you can use Microsoft Excel or any other compatible spreadsheet software to modify the template as needed.
XLTX is Developed by: Microsoft
XLTX was Released on: 2007
Useful Links for XLTX:
How to convert XLTX?
To convert XLTX files to other formats like XLSX or CSV, use our online spreadsheet converter. Upload your XLTX file, select the desired output format, and start the conversion.
Our converter ensures high-quality conversion, preserving the original template layout and data for seamless use across various platforms.
What Our Users Say
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Saved me hours of work
I had to convert multiple PDFs to Word for editing. This tool made it so easy and preserved all the formatting perfectly. The batch processing feature is a game changer.
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I've tried many conversion tools but this one is by far the fastest and most reliable. No watermarks, no quality loss, and the interface is so intuitive.
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