Excel to CSV Converter

How to Use the Excel to CSV Converter

Simply drag and drop an Excel file (.xlsx or .xls) into the tool, or click to browse your computer. The converter automatically detects your spreadsheet structure and displays a preview of the data. Customize the delimiter, encoding, and date format to match your needs, then download or copy the CSV output.

Features

• Multi-sheet support: Automatically detects multiple sheets and lets you convert individual sheets or download all as separate CSVs in a ZIP
• Delimiter options: Choose comma, semicolon, tab, or pipe as your field separator
• Header handling: Toggle whether to include the header row in the CSV output
• Field quoting: Option to quote all fields for compatibility with strict CSV parsers
• Encoding support: Choose between standard UTF-8 or UTF-8 with BOM (Byte Order Mark) for better Excel compatibility
• Date formatting: Convert dates to ISO (YYYY-MM-DD), US (MM/DD/YYYY), EU (DD/MM/YYYY), or keep Excel serial format
• Data preview: See your data in a scrollable table before downloading
• Copy & download: Copy CSV to clipboard or download as a file
• Instant processing: All processing happens in your browser, no server upload

Understanding Date Formats

ISO (YYYY-MM-DD)

The international standard format. Best for data analysis and cross-platform compatibility. Example: 2026-04-15

US (MM/DD/YYYY)

Common in North America. Example: 04/15/2026

EU (DD/MM/YYYY)

Standard in most European countries. Example: 15/04/2026

Excel Serial

Preserves the Excel internal date representation as a number. Useful if you need to maintain exact formatting.

Delimiter and Encoding Options

Delimiters

The character that separates fields in your CSV. Standard CSV uses commas, but some locales use semicolons. Tab and pipe are also common in data processing.

UTF-8 vs UTF-8 with BOM

UTF-8 is the standard encoding. UTF-8 with BOM adds a special marker at the beginning of the file that helps older versions of Excel recognize the file as UTF-8 encoded, ensuring proper display of special characters.

Frequently Asked Questions

Does this tool support .xls files?

Yes. The tool supports both modern .xlsx files and legacy .xls Excel files using the SheetJS library.

What if my Excel file has multiple sheets?

The tool will detect all sheets and let you choose which one to convert. You can also download all sheets at once as separate CSV files packaged in a ZIP file.

Does this tool handle formulas?

The tool converts the calculated values from formulas, not the formulas themselves. If a cell contains a formula, the CSV will show its result.

Is my Excel file sent to any server?

No. Everything runs in your browser. Your Excel file is never uploaded or sent anywhere. It's completely private and secure.

Can I use this for large Excel files?

Yes, the tool handles files up to 10MB. However, very large files may take a moment to process in your browser.

How are merged cells handled?

Merged cells are flattened into individual cells with the merged value appearing in the first cell. This is standard CSV behavior.

What about formatting, colors, and styles?

CSV is a plain text format, so formatting, colors, fonts, and styles are not preserved. Only the raw cell data is converted.