Compare XLS to XLSX Files - SheetCompare

Compare XLS and XLSX files to find differences, duplicates, and changes. Free online tool for spreadsheet comparison.

About XLS Files

XLS is the legacy Excel binary format used before 2007. While older, it remains widely used for compatibility with older systems and Excel versions.

About XLSX Files

XLSX is the modern Excel format introduced in 2007, based on Open XML. It offers smaller file sizes, improved data recovery, and better compatibility with other applications.

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