Excel to CSVConvert Excel spreadsheets to CSV format with sheet selection.

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Excel to CSV

Convert Excel spreadsheets to CSV format with sheet selection.

How to Use

Upload Excel file

Drop or select your Excel file (.xlsx, .xls, .ods).

Select sheet

Choose the sheet to convert if there are multiple.

Download CSV

Copy or download the CSV output.

What Is Excel to CSV?

Excel to CSV converts Microsoft Excel spreadsheets into plain-text comma-separated values format. CSV is universally compatible with databases, programming languages, and data tools. Using the SheetJS library, this converter handles .xlsx, .xls, .xlsb, and .ods formats with multi-sheet support. The conversion preserves cell values and produces standard CSV output that can be opened in any text editor, imported into databases, or processed by scripts.

Why Use Our Excel to CSV?

Supports all major spreadsheet formats (.xlsx, .xls, .ods).
Multi-sheet workbooks with sheet selector.
Standard CSV output compatible with all tools.
Browser-based — no file upload to servers.

Common Use Cases

Data Processing

Convert Excel files to CSV for processing with command-line tools, scripts, or data pipelines.

Database Import

Transform Excel data into CSV for bulk import into SQL databases.

Cross-Platform Sharing

Convert Excel files to the universally compatible CSV format.

Version Control

Convert spreadsheet data to text-based CSV for tracking changes in Git.

Technical Guide

The converter uses SheetJS's sheet_to_csv() utility which handles the conversion of cell values to CSV format. The utility processes each cell in the worksheet and outputs its value using comma delimiters and standard CSV quoting rules. Cell types handled: numbers are output as numeric strings, text is output with CSV quoting when necessary, booleans become TRUE/FALSE, dates are formatted using the cell's number format, and errors are output as their error type. The SheetJS library reads the binary Excel format in-memory using an ArrayBuffer, making the conversion fully client-side. For multi-sheet workbooks, users select which sheet to convert.

Tips & Best Practices

1
Select the correct sheet from multi-sheet workbooks before downloading.
2
Merged cells may produce unexpected results — consider unmerging before conversion.
3
Formula results (not formulas themselves) are exported to CSV.
4
Date formatting depends on the cell's number format in Excel.

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Frequently Asked Questions

QCan I convert all sheets at once?

Currently, you convert one sheet at a time. Select each sheet to convert it separately.

QAre formulas included?

Formula results are included, not the formula expressions themselves.

QHow are dates formatted?

Dates use the number format from the Excel cell. If no format is set, a default date string is used.

QIs the CSV UTF-8 encoded?

Yes, the output is UTF-8 text. This may need a BOM for correct display in some Excel versions.

QWhat about password-protected files?

Password-protected Excel files cannot be processed in the browser. Remove the password protection first.

About Excel to CSV

Excel to CSV is a free online tool from FreeToolkit.ai. All processing happens directly in your browser — your data never leaves your device. No registration required. No ads. Just fast, reliable tools.