CSV to Excel Converter (& Excel to CSV)
Convert CSV files to real .xlsx workbooks and Excel files back to clean CSV — entirely in your browser, no upload, no size games.
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CSV → Excel
The CSV is empty or unreadable.
Excel → CSV
Working…
Could not read the file — choose a valid .xlsx (legacy .xls is not supported).
Preview (first rows) —
Note: date cells may arrive as Excel's stored serial numbers (e.g. 45123) — see the FAQ.
Both Directions, No Upload
CSV → Excel: paste or choose a CSV (comma, semicolon or tab separated — detected automatically) and download a genuine .xlsx workbook. Numbers arrive as numbers, text as text, and Turkish/accented characters survive intact — the three things that go wrong when people just rename a .csv to .xlsx.
Excel → CSV: choose an .xlsx file, pick the sheet if there are several, preview the data and download it as UTF-8 CSV with the delimiter of your choice. A BOM is included so Excel reopens the CSV with correct accented characters.
Conversion happens entirely in your browser — the file never leaves your device, which matters for financial exports and customer lists. There is no row limit beyond your device's memory.
Frequently Asked Questions
Why do my dates show as numbers like 45123 after Excel → CSV?
Excel stores dates as serial numbers and the "date look" lives in cell formatting. If a date arrives as a plain number, format the column as text (or re-export with dates as text) before converting; the tool faithfully exports what the cell stores.
Which delimiter should I choose for the CSV?
Comma is the international standard. Choose semicolon if the file will be opened in Excel with a European/Turkish locale, where the list separator is ";" — otherwise everything lands in one column.
Are formulas converted?
CSV has no formulas, so Excel → CSV exports each formula's last calculated value. CSV → Excel produces value cells only.
Is my file uploaded anywhere?
No. Both directions run with JavaScript in your browser; nothing is transmitted, and closing the tab removes everything.
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CSV to Excel Converter (& Excel to CSV)