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