XLSX to XLS Converter
Free, fast, and secure. Convert XLSX files to XLS directly in your browser — no uploads, no limits.
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About XLSX to XLS Conversion
Transform your documents for maximum compatibility. Whether you're switching between Office formats, converting to universal PDF, or adapting files for specific software, our converter handles the complexity.
How to Convert XLSX to XLS
Converting files has never been easier or more secure. MixConvert uses advanced browser-based technology to process your files instantly without uploading them to a remote server. Follow these simple steps to get started:
- Select Your Files: Select your XLSX files by clicking the upload zone or dragging them directly onto the page.
- Choose Output Format: Confirm XLS is set as the destination format in the format selector.
- Convert Instantly: Click the convert button to begin. Your XLSX files will be processed locally in seconds.
- Download: Save your new XLS files directly to your device. Batch download available for multiple files.
XLSX to XLS FAQ
Can I convert XLSX to XLS on mobile devices?
Absolutely! Our converter is fully responsive and works on any smartphone or tablet. Just visit this page, upload your XLSX files, and convert them to XLS format—no app required.
Is my data secure when converting XLSX files?
100% secure. Unlike cloud converters, MixConvert processes your XLSX files entirely on your device using WebAssembly. Your data stays on your computer—we never see it.
How large can my XLSX files be?
We don't impose file size restrictions. Your browser handles the conversion, so the limit depends on your device's memory. Typical computers can process very large XLSX files without issues.
What's the conversion speed for XLSX files?
Conversion is nearly instant for typical XLSX files. Your device's processor handles the work, so faster devices complete XLS conversion more quickly.
Does MixConvert support converting multiple XLSX files at once?
Batch conversion is fully supported. Upload as many XLSX files as you need and convert them all to XLS in one go. A ZIP download option makes it easy to save everything.
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Understanding the Formats
XLSX
Microsoft Excel Workbook
Excel's modern spreadsheet format supporting formulas, charts, and multiple sheets.
XLS
Microsoft Excel 97-2003
Legacy Excel format for compatibility with older systems.
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