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CSV vs XLSX: which format should you use?
CSV and XLSX both store tables, but they solve different problems. Use this page to pick the right one.
| Feature | CSV | XLSX |
|---|---|---|
| What it is | Plain text, one row per line, values split by a separator | A zipped package of XML files used by Excel |
| Formatting | None. No bold, colors or column widths | Fonts, colors, widths, frozen rows and filters |
| Formulas | Values only | Formulas and calculated cells |
| Multiple sheets | One table per file | Many sheets in one workbook |
| Charts and images | Not supported | Supported |
| Data types | Everything is text until a program guesses | Text, numbers and dates are stored explicitly |
| File size | Small for simple data | Compressed, but can be larger for tiny tables |
| Best for | Moving data between systems, imports, exports, scripts | Reading, analyzing and sharing data with people |
When to use CSV
Choose CSV when software needs to read the data: importing contacts into a CRM, loading products into a store, or feeding a database or script. CSV is universal and lightweight.
When to use XLSX
Choose XLSX when a person will work with the data. You get readable columns, a styled header, filters and a frozen top row, and you can add formulas or more sheets later.
Convert between them
Turn a CSV into a workbook with the makiconvertpro converter, or follow the step-by-step guide to use Excel's own import.