XLS to XLSX Converter
Free online tool to convert XLS to XLSX 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.
0 files uploaded. 100 files remaining.
Maximum file size is 1GB
How It Works
How to Convert XLS to XLSX
Click inside the file drop area to upload your XLS file or drag & drop it.
Locate your XLS file on your device—typically used for various purposes. Ensure the file is under 50MB to avoid upload issues. If the upload fails, check your internet connection or try compressing the file first.
Select XLSX as the output format and click the 'Convert' button.
Choose XLSX based on your needs—different formats suit different purposes, like JPEG for smaller file sizes. The conversion process typically takes a few seconds, depending on file size and server load.
Download the converted XLSX file instantly after conversion.
Once the conversion is complete, click the download link to save your XLSX file. You can then open it in software like a compatible viewer. If the file doesn’t download, ensure your browser allows pop-ups from RunConvert.
You can also send a link to the converted file via email. (Optional)
Enter an email address to receive a secure link to your converted file, which is useful for sharing with clients or accessing later. Links expire after 24 hours for security, and RunConvert ensures your data is protected during transmission.
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 and xlsx file conversions asked by our users on RunConvert.com.
Frequently Asked Questions
Q: Is it safe to upload XLS files to RunConvert.com?
A: Totally safe. RunConvert.com encrypts your files, like a digital safe for your spreadsheets. Your data is protected.
Q: How fast is XLS conversion on RunConvert.com?
A: Quick as a snap—usually just seconds! RunConvert.com processes XLS files fast, so you’re ready to go.
Q: What’s the best format to convert XLSX to for sharing?
A: PDF is great for sharing spreadsheets. It’s universal and keeps your data intact. RunConvert.com makes the switch seamless.
Q: Why does my converted XLSX look different?
A: Some fonts or formulas might not carry over perfectly. It’s like wearing a suit tailored for someone else. RunConvert.com does its best, but using standard fonts helps.
Q: Can I batch convert multiple spreadsheets at once?
A: Right now, RunConvert handles one file at a time. But batch conversion is in the pipeline, so stay tuned!
Q: Does RunConvert compress spreadsheet files?
A: We don’t compress them by default, but the resulting files are often smaller—especially if converting from XLS to XLSX or to CSV.
Q: Do charts survive conversion to PDF?
A: Yup! Charts are usually preserved as visuals when you go XLSX → PDF. Just make sure they’re not floating off the page.
Q: Can I upload a file from a URL for conversion?
A: Not yet, but we’re exploring this feature. For now, you’ll need to download it and upload from your device.
Q: Does converting spreadsheets affect file size?
A: It can! XLSX files are usually smaller than XLS. CSVs are super light, but lose features. PDFs can be bulky if there’s a lot of formatting or images.
Q: Do hyperlinks survive spreadsheet conversion?
A: Yes, if you’re using formats like XLSX or ODS. In PDFs, they often still work. In CSVs though, you’ll just see plain text URLs.
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 XLSX (Excel Spreadsheet)?
XLSX (Excel Spreadsheet) is a file format used by Microsoft Excel to store spreadsheets. It is a more modern and efficient version of the older XLS format and is based on XML (Extensible Markup Language).
XLSX files can store multiple sheets, data tables, charts, graphs, and more complex data structures. This format is widely used for organizing, analyzing, and visualizing data.
How to open XLSX?
XLSX files can be opened using spreadsheet programs like Microsoft Excel, Google Sheets, LibreOffice Calc, and Apple Numbers. These applications fully support the features of XLSX files, such as multiple sheets, formulas, and charts.
To open XLSX files in Excel or Google Sheets, simply double-click the file or import it directly into the application.
XLSX is Developed by: Microsoft
XLSX was Released on: 2007
Useful Links for XLSX:
How to convert XLSX?
You can convert XLSX files to other formats, such as CSV, PDF, or JSON, using online file converters. Upload the XLSX file and choose the desired output format.
Many spreadsheet applications like Excel also allow saving XLSX files in other formats, enabling cross-platform compatibility.
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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