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Excel files (XLS or XLSX) are excellent for formatting and formulas, but they are "heavy" files. CSV (Comma Separated Values) files are plain text, making them the universal language for data exchange. They are lightweight, easy to read by any programming language, and required by most bulk-upload tools. Top Free XLS to CSV Converter Downloads 1. LibreOffice Calc Gnumeric is a high-precision spreadsheet program known for
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Most tools will ask if you want to use commas or semicolons. Stick with commas for standard CSVs. Online vs. Desktop Converters