Zero-Server Storage  ·  100% Private Your files are processed entirely in your browser. Nothing is uploaded, stored, or seen by anyone — safe for confidential & GDPR/HIPAA-sensitive documents.

XLS to XLSX Converter - Free & Offline (No Upload)

No Upload 100% Private Free

Drop your XLS file here

or click to select a XLS file

Frequently Asked Questions

Is my data private?

Yes. All processing happens in your browser with no data sent to any server.

Is there a size limit?

No limit. Processing is limited only by your browser's memory.

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