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Open Excel and CSV files in your browser and check what is inside, even without Excel.

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Excel viewer
Free online XLSX viewer: open .xlsx, .xls, .ods and .numbers files in your browser and see hidden sheets, hidden rows and formulas. Nothing is uploaded.
CSV viewer
Free online CSV viewer: open a CSV file as a table with leading zeros and long numbers kept as written, then sort and search it. Nothing is uploaded.