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XLS is the original spreadsheet file format for Microsoft Excel (up to version 2003). It stores data in rows and columns, with support for formulas, charts, and macros. XLS files have been largely replaced by the newer XLSX format.
XLSX is the modern Excel spreadsheet format introduced with Microsoft Office 2007. It uses ZIP compression and an XML-based structure, resulting in smaller files and better compatibility. XLSX supports advanced spreadsheet features and is widely used in business and data analysis.
Convert your .xls files to .xlsx right in your browser — no downloads, no installs. Everything happens securely in the cloud.
We never store your files permanently. Only you can access them, and they’re automatically deleted from our servers within 2 hours.
Turn your XLS files into XLSX in just a couple of clicks. No registration, no limits — and it’s 100% free.