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Convert.csv

Convert CSV to Excel online

100% localFiles never leave your device — no upload, no account, no tracking.
About CSV to Excel

Turn a plain CSV file into a proper Excel XLSX workbook that opens cleanly in Excel, Numbers, or Google Sheets with columns intact. We build the workbook locally with SheetJS.

The conversion runs entirely in your browser. Your data never leaves your device, which matters for spreadsheets with sensitive records.

How it works
  1. 01

    Add a CSV

    Drop your CSV file onto the page or pick it from your device.

  2. 02

    Convert

    Click Convert to build an XLSX workbook locally.

  3. 03

    Download

    Save the XLSX file.

Features
opens in Excelkeeps columnsno install
Frequently asked
How does the CSV to Excel converter work?
Turn a plain CSV file into a proper Excel XLSX workbook that opens cleanly in Excel, Numbers, or Google Sheets with columns intact. We build the workbook locally with SheetJS.
Are my files uploaded to a server?
No. Everything runs entirely in your browser using local JavaScript and WebAssembly. Your files never leave your device.
Does it cost anything or require an account?
No. The converter is free, needs no sign-up, and runs locally in your browser.
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