How to Convert Excel (XLSX) to CSV — Data Export Guide
Need to export Excel spreadsheets to CSV? Learn when and how to convert XLSX to CSV for data import, analysis, and integration.
CSV (Comma-Separated Values) is the universal format for data exchange. Converting Excel files to CSV is essential for database imports, API integrations, and data analysis pipelines.
When to Use CSV Over Excel
Database imports — MySQL, PostgreSQL, MongoDB all accept CSV
API integrations — many services require CSV uploads
Data science — Python pandas, R, and other tools read CSV natively
Lightweight sharing — CSV files are plain text and tiny
Version control — CSV works well with Git for tracking changes
How to Convert XLSX to CSV
Upload your Excel file to Convert999
Select CSV as the output format
Convert and download
**Important notes:**
Only the active sheet is converted (multi-sheet workbooks produce one CSV per sheet)
Formulas are converted to their calculated values
Formatting (colors, fonts, borders) is not preserved in CSV
Dates are converted to standard ISO format
CSV Best Practices
**Use UTF-8 encoding** for international characters
**Quote fields containing commas** to avoid parsing errors
**Include a header row** with column names
**Avoid merged cells** in your Excel file before converting
**Check date formats** after conversion — different systems expect different formats