free excel to csv converter

Spreadsheets live in two worlds: Excel's .xlsx for working, and CSV for importing into databases, apps, and tools that only speak plain text. Moving between them shouldn't need Office installed.

Drop in an .xlsx file, pick the worksheet, preview the first rows, and download a clean CSV. Going the other way, drop a CSV and get a real .xlsx workbook back. Both directions run entirely in your browser.

Why most online tools for this are annoying

Desktop Office is overkill for a format swap, and most online converters upload your spreadsheet to a server — a non-starter for sales figures, payroll, or customer lists. Many also choke on multiple worksheets or silently drop your formatting.

How to do it in 3 steps

1. Choose a direction. Excel → CSV, or CSV → Excel.
2. Drop in your file. For Excel files, pick which worksheet to convert. Preview the first rows live.
3. Download. Get your CSV or .xlsx instantly. No signup, no upload, no row limits.

Private by design: nothing ever uploads

Spreadsheets are where the sensitive numbers live. This converter parses your file with JavaScript on your own device — the data never uploads, so there's nothing to leak, breach, or subpoena.

Getting the most out of it

Multi-sheet workbooks: convert each sheet separately by picking it from the worksheet dropdown.

CSV has no formatting — colors and formulas become plain values, which is exactly what imports expect.

Check the row/column counts in the stats before downloading to confirm the right sheet was read.

Frequently asked questions