Convert XLS to XLSX Online
Convert Excel XLS workbook to XLSX workbook. Adjust available output settings, batch-process multiple files, and download the XLSX results without installing software.
XLS
XLSX
Secure & private
Files deleted in 24h
No signup needed
Drop your XLS file here
or click to select
Secure & private
Files deleted in 24h
No signup needed
How XLS to XLSX works
Upload XLS
Drag & drop or click to select your XLS file.
Choose Options
Adjust quality, size, or other output settings if needed.
Download XLSX
Click Convert and your XLSX file downloads instantly.
About XLS to XLSX conversion
Excel xls workbook files are commonly converted to XLSX when a workflow needs XLSX workbook compatibility.
Upload the source to xlsx.now, review the available options, and download the converted file when processing completes.
Keep the original source file when editability, formulas, animation, metadata, or advanced formatting may be needed later.
Where XLSX comes from
XLS and XLSX serve different document or data workflows. Conversion changes the file representation while preserving supported information.
XLS vs XLSX at a glance
| XLS | XLSX | |
|---|---|---|
| Source | Excel XLS workbook | XLSX workbook |
| Best for | Editing and source preservation | Sharing and destination compatibility |
Real-world workflow — Convert XLS to XLSX
- Select the XLS source file.
- Upload it securely.
- Choose XLSX as the output.
- Start conversion.
- Download and review the result.
When to convert XLS to XLSX
Converting XLS to XLSX is a common workflow requirement wherever different software systems, platforms, and applications need to exchange image or document content. Whether you are preparing files for web publishing, print production, client delivery, or meeting upload requirements, having the right format is the starting point for every distribution workflow.
XLS files are tied to specific software ecosystems and tools. When that content needs to move into a context that requires XLSX - A different editing environment, a submission portal, a print service, or a sharing platform - A fast, reliable converter removes the format barrier without requiring software installation or technical knowledge.
xlsx.now processes your file securely in the cloud and returns a clean XLSX output that meets the format specification of standard applications and platforms. Files are processed privately and automatically deleted after 24 hours - Nothing is stored beyond what is needed to complete your conversion.
XLS to XLSX tips
- Keep a copy of the original file.
- Review complex layouts, fonts, formulas, or nested data after conversion.
- Use the destination format that matches the receiving application.
Formats involved
XLS – Microsoft Excel Spreadsheet
About XLS
XLS is a specialised image format. Converting to XLSX provides wider compatibility and easier sharing across applications and platforms.
XLSX – Microsoft Excel Spreadsheet (XML)
About XLSX
XLSX is the target format for this conversion - Supported by the applications and workflows that require it specifically.
XLSX Converter
XLS to XLSX — frequently asked questions
Upload your XLS file, choose any available settings, start the conversion, and download the finished XLSX file.
Yes. xlsx.now lets guests convert files without installing software or creating an account.
Files are encrypted in transit and scheduled for automatic deletion after processing.
The converter preserves supported content and layout, but features that XLSX cannot represent may be flattened or omitted.
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