Compare XLS and CSV files to find differences, duplicates, and changes. Free online tool for spreadsheet comparison.
XLS is the legacy Excel binary format used before 2007. While older, it remains widely used for compatibility with older systems and Excel versions.
CSV (Comma-Separated Values) is a universal plain-text format that stores tabular data with values separated by commas. It's highly portable and compatible with virtually all spreadsheet applications.
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