The best free tools for converting XLS to CSV vary by your specific needs, such as whether you prioritize data privacy, require bulk batch conversion, or need a command-line script. Because CSV files are plain text, converting from a binary XLS format removes all cell colors, multiple sheets, and formulas, leaving only the raw data.
The top free tools and methods are grouped below by category. 1. Built-In Office Software (Best for Data Privacy)
If you already have office software installed, using its native interface is completely free, secure, and requires no internet connection.
Microsoft Excel: The most robust choice if you already own it.
How it works: Open your XLS file, click File > Save As, and choose CSV UTF-8 (Comma delimited) from the dropdown. UTF-8 ensures that special non-English characters are not lost or corrupted during the transition.
LibreOffice Calc: The premier completely free, open-source alternative to Excel.
How it works: Works across Windows, Mac, and Linux. You open the document and save it as a text CSV. It also features a headless command-line mode for bulk conversions without opening the graphical interface.
2. Browser-Based Online Converters (Best for Quick, Single Files)
Online tools are incredibly fast and require zero software installation. However, ensure you do not use them for highly sensitive corporate or personal financial data.
CloudConvert XLS to CSV: An advanced online document manager.
Why it’s great: It uses high-quality modern conversion engines to ensure formatting changes do not break your data structure. It gives you a limited number of free conversions per day.
ExcelMaster.ai XLSX to CSV Converter: A privacy-focused online web application.
Why it’s great: It handles merge cells by keeping the data value anchored safely in the top-left cell, and automatically applies UTF-8 with BOM format to keep special characters intact.
Zamzar Excel to CSV: One of the oldest and most reliable web file converters.
Why it’s great: Incredibly simple drag-and-drop workflow that sends a download link directly to your browser once complete.
3. Developer & Automation Tools (Best for Bulk Data & Scripts)
If you have hundreds of files or need to automate the process daily, these free automated methods work best. Convert xlsx to csv in Linux with command line [closed]
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