Excel to CSV Converter

Parse .xlsx and .xls Excel spreadsheets to CSV format with sheet selection. All processing happens in your browser.

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1. Upload an .xlsx or .xls Excel file by clicking the drop zone or dragging it in. 2. If the workbook contains multiple sheets, select which sheet to convert from the dropdown. 3. Preview the parsed sheet data in the table view to verify the content. 4. Choose the output delimiter (comma, semicolon, or tab) and configure header options. 5. Click Convert to generate the CSV output, then copy it to your clipboard or download as a .csv file.

About This Tool

The Excel to CSV Converter parses Microsoft Excel files (.xlsx and .xls) and exports their contents as clean CSV text. If your workbook contains multiple sheets, you can select which sheet to convert and preview the data before downloading. The tool handles formatted cells, merged regions, dates, formulas (using their computed values), and special characters.

CSV is the most widely supported data interchange format, accepted by databases, programming languages, data analysis tools, and virtually every application that works with tabular data. Converting Excel files to CSV strips away formatting and formulas to produce a simple, portable text file that works everywhere.

The converter runs entirely client-side using SheetJS, so your spreadsheet data stays on your device. It supports configurable output options including delimiter choice (comma, semicolon, tab), whether to include headers, and how to handle empty cells. The resulting CSV file uses UTF-8 encoding for full international character support.

Frequently Asked Questions

The tool supports both .xlsx (Excel 2007 and later) and .xls (legacy Excel 97-2003) formats. It also handles .xlsm files with macros, though the macros themselves are not included in the CSV output.
Formulas are converted using their last-computed values. If a cell contains =SUM(A1:A5) and the result was 100, the CSV output will contain 100. The formula itself is not included since CSV does not support formulas.
Yes. When you upload a workbook with multiple sheets, a dropdown lets you choose which sheet to convert. You can preview the data from each sheet before exporting to CSV.
Excel dates are converted to ISO 8601 format (YYYY-MM-DD) by default. This format is universally recognized by databases and programming languages, avoiding ambiguity between date formats.
Merged cells are expanded so that the value appears in the top-left cell of the merged range, and the remaining cells in the range are left empty. This preserves the data while maintaining the correct column alignment.

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