How to Convert CSV to Excel Online (Free, No Upload)

Convert CSV to Excel in seconds, right in your browser, with no install and no account.

CSV opens in Excel, but it often goes wrong: leading zeros disappear, long numbers turn into 1.23E+15, and dates are misread. An .xlsx file avoids those problems.

The converter writes a real Excel file with a bold header row, correct number and date types, and sensible column widths, so it is ready to open and share.

Your file is processed in your browser and is not uploaded to a server, so it is safe to use with customer or business data.

Open the CSV to Excel converter

How to use the CSV to Excel converter: step by step

  1. Open the CSV to Excel converter.
  2. Drop your file into the box, or paste the data.
  3. Click Convert.
  4. Copy the result, or click Download to save the Excel file.

When to use the CSV to Excel converter

  • Sharing a CSV export with business users
  • Keeping dates and numbers correct in Excel
  • Sending a report to a manager
  • Making a clean file from a database export

Tip: Excel stops at 1,048,576 rows. Split very large files first.