Excel Tools

XLS to XLSX

Modernize legacy XLS files to the XLSX format. Fast, secure, and free — right in your browser.

Drag & drop your files here

or click to browse — your files stay private

XLS
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How to use XLS to XLSX

1
Open the toolLand on the XLS to XLSX page — no account or download required.
2
Upload your fileDrag and drop into the upload box, or click to pick files from your device.
3
Choose your optionsPick the settings that fit your needs; smart defaults are pre-selected.
4
Process & downloadHit the action button, watch the progress bar, and download your result.
Your privacy is protected. Your files are processed entirely in your browser — they never leave your device or get uploaded to any server.

About XLS to XLSX

XLS to XLSX by ToolTasker lets you modernize legacy XLS files to the XLSX format. It runs entirely online in your browser, so there's nothing to install and your work is never shared. Whether you're a student polishing an assignment, an office handling daily paperwork, a business scaling its workflow, or a creator perfecting assets, xls to xlsx delivers professional-quality results in seconds.

ToolTasker keeps the xls to xlsx experience fast and private: all processing happens locally in your browser, so your files are never uploaded to a server. The tool works on every device — Windows, macOS, Android, and iOS — with the same clean, premium interface. Need more? Pair it with related tools like XLSX to XLS, Excel Compressor, CSV to Excel to handle your entire file workflow in one place.

Frequently asked questions

How do I use the XLS to XLSX tool?+
Upload your file using the drag-and-drop box (or click to browse), choose your options, press the action button, and download the finished result in seconds.
Is XLS to XLSX free?+
Yes — this tool is free to use with no signup. ToolTasker Premium unlocks batch processing, larger files, faster speeds, and an ad-free experience.
Are my files kept private?+
Your files are processed entirely inside your browser and are never uploaded to a server, so nothing you process leaves your device.
Which formats are supported?+
Supported formats include XLS.
Does it work on mobile?+
Yes. ToolTasker runs entirely in your browser, so the tool works on phones, tablets, and computers with nothing to install.