Tools / File Converter / CSV to XLSX Converter

CSV to XLSX Converter

Convert CSV files to XLSX. Free and without uploading.

This tool converts CSV files to XLSX. CSV stores table data as plain text: one record per line, values separated by commas or semicolons. It carries no formatting or multiple sheets.

XLSX is Microsoft Excel’s current workbook format. It holds multiple sheets, formatting and formulas. The tool detects the delimiter (comma, semicolon, tab) and decimal style by itself, so numbers arrive in Excel as numbers.

Conversion happens inside your browser; your files are never sent to a server.

How to use

1. Drag and drop your CSV files, paste them, fetch one from a link, or use "Choose files".
2. The target format is preselected; you can add several files at once.
3. Press "Convert" and download the XLSX files.

Frequently asked questions

Is anything lost when converting CSV to XLSX?

The content is kept; formatting the target format doesn’t support (such as colours or fonts) may be lost.

How many files can I convert at once?

There is no limit. Download the results one by one or as a ZIP.

Are my files uploaded?

No. Your CSV files are converted to XLSX inside your browser.