CSV to Excel Converter

Turn CSV into a real .xlsx workbook — paste or load a file, preview the table, and download. Delimiter auto-detect. Runs in your browser; nothing is uploaded.

How to Convert CSV to Excel

Three steps, all in your browser.

1

Paste or load your CSV

Paste CSV text into the box, or click “Load .csv file” to open a spreadsheet export. The tool parses it as you type and shows a live preview.

2

Check the preview

Leave the delimiter on Auto-detect for commas, semicolons or tabs, and confirm the row and column count. Need JSON instead? Try the CSV to JSON Converter, or go the other way with Excel to CSV.

3

Download the workbook

Click Download .xlsx to save a real Excel workbook that opens in Excel, Google Sheets or LibreOffice. Nothing is uploaded — it all happens on your device.

Frequently Asked Questions

How do I convert CSV to Excel?
Paste your CSV into the input box, or load a .csv file. The tool parses it in your browser and shows a live preview of the table. Check the row and column count, then click Download .xlsx to save a real Excel workbook. The delimiter is auto-detected, so comma, semicolon and tab-separated files all work.
Is my data uploaded anywhere?
No. The conversion runs entirely in your browser with JavaScript. The CSV you paste or the file you load is parsed on your own device and the .xlsx workbook is built locally — nothing is sent to a server, logged, or stored. That means you can safely convert private exports, customer lists, or internal data, and the tool keeps working offline once the page has loaded.
Is the output a real .xlsx file?
Yes. The download is a genuine .xlsx workbook that opens in Microsoft Excel, Google Sheets, LibreOffice Calc, Numbers and anything else that reads Excel files — not a CSV renamed with an .xlsx extension. The data lands on a single sheet named Sheet1, one row per CSV line.
Does it handle commas and line breaks inside quoted fields?
Yes. The parser follows the RFC 4180 CSV rules, so a value wrapped in double quotes can contain commas, line breaks and escaped quotes (written as two double quotes) without breaking the columns. This matches how Excel, Google Sheets and most database exports quote their data, so pasted spreadsheet output converts cleanly.
Are numbers kept as numbers?
Yes. Cells that look like plain numbers, such as 42 or 3.14, are written to the workbook as real numeric cells so Excel can sum and chart them straight away. Text that only looks numeric in special ways — leading-zero codes or very long IDs — is best kept as text; if precision matters, format those columns as text in Excel after opening.

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