Free online tool

CSV to Excel Converter

Preview your columns, protect leading zeros and download an XLSX workbook.

Upload a file

Drop your file hereTap to choose a file

or click to browse, or paste from the clipboard

Keep leading zeros and long IDs

Columns with values such as 00123 or order numbers longer than 15 digits stay as exact text, so Excel cannot drop zeros or round digits.

Preview and set column types

Check the first 50 rows, then set any column to text, number or ISO date before you create the workbook.

Converted in your browser

The CSV is read on your device. Comma, semicolon, tab and pipe delimiters and common encodings are detected automatically.

How to convert CSV to Excel

  1. 1

    Choose a CSV file or paste CSV text.

  2. 2

    Check the detected delimiter and the column preview. Change a column type if needed.

  3. 3

    Select Create Excel file, then download the XLSX workbook.

What people use this tool for

  • Open a mailing list in Excel without losing the leading zero in ZIP codes such as 02134.
  • Share an order export with long order IDs as an Excel workbook.
  • Turn a semicolon-separated export with decimal commas into real Excel numbers.

Frequently Asked Questions

Why does Excel remove leading zeros from my CSV?

When Excel opens a CSV directly, it converts values such as 00123 into the number 123. This converter writes those columns as text cells with Excel's Text format, so the zeros remain.

Will long order numbers keep every digit?

Yes. Excel stores numbers with up to 15 significant digits, so longer numeric values are written as text. Auto creates number cells only when Excel can hold the value exactly.

Which delimiters and encodings are supported?

Comma, semicolon, tab and pipe delimiters, quoted values with line breaks, and UTF-8, UTF-16 or Windows-1252 text. You can override the detected delimiter and encoding.

How are dates handled?

Auto turns a column into Excel dates only when every value is an ISO date such as 2024-03-05, on or after 1 March 1900. Choose Date for ISO date-times. Other date styles stay as text, so day and month are never swapped.

Are values starting with = treated as formulas?

No. Every value is written as a cell value, never as a formula, so text such as =SUM(A1) appears exactly as it does in the CSV.

Is my CSV uploaded?

No. The CSV is read and the XLSX workbook is created in your browser. Files up to 20 MiB and 1,048,576 rows are supported.