Format comparison
CSV vs XLSX
CSV is a plain-text table for interchange; XLSX is a full Excel workbook with sheets, formulas, and formatting.
Decision table
| Feature | CSV | XLSX |
|---|---|---|
| Structure | One flat table | Multiple sheets + objects |
| Formulas | No | Yes |
| Formatting | No | Yes |
| Best for | Data interchange | Human analysis in Excel |
| Typical size | Very compact | Larger |
| Encoding pitfalls | Common | Fewer for casual users |
| Database import | Excellent | Possible but heavier |
Choose CSV when…
- SaaS exports into pipelines
- Database COPY/import
- Git-friendly data dumps
- Values-only handoffs
Choose XLSX when…
- Financial models
- Formatted reports
- Pivot-friendly analysis
- Multi-sheet workbooks
Verdict
Use CSV for imports, scripts, and values-only exchange. Use XLSX when people need filters, formulas, charts, or multiple sheets.
Convert between them
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