Convert CSV to Excel Online

Turn CSV files into Excel sheets (.xlsx or .xls) with dates, numbers and codes recognized correctly: no lost leading zeros and no numbers in scientific notation.

Drag your CSV files here

or click to choose them · CSV, TSV, TXT · up to 25 MB

Options

Codes with leading zeros (007), phone numbers and numbers with more than 15 digits are saved as text so Excel does not change them.

    Everything happens in your browser: your files are never uploaded to or stored on the server.

    What does converting CSV to Excel mean?

    A CSV is a text file with data separated by commas, semicolons or tabs. It is the format exported by banks, online stores and many systems, but it does not store formatting or data types.

    Converting it to Excel creates a real workbook: with dates you can sort, numbers you can calculate with, a bold, frozen header row and columns with the right width.

    Advantages

    • Keeps leading zeros, phone numbers and long numbers (IDs, document numbers).
    • Detects the separator, the encoding and the regional format (1.234,56 or 1,234.56).
    • Converts dates, times, percentages and currencies to their real type.
    • Safe: content is never saved as a formula.
    • Fast even with hundreds of thousands of rows.

    How to convert CSV to Excel

    1. Drag your CSV, TSV or TXT files onto the tool.
    2. Choose the output format: XLSX or XLS.
    3. Let the separator, encoding and regional format be detected, or set them by hand.
    4. Click convert and download your Excel sheet.

    Ideas for using it

    • Open bank statements exported as CSV.
    • Work with orders or products from your online store.
    • Prepare contact lists with phone numbers and postal codes.
    • Analyze exports from a CRM or Google Analytics.
    • Share data with people who only use Excel.

    Tips for the best result

    • If you see strange characters, choose a different encoding by hand.
    • Check the regional format if decimals look wrong.
    • Use XLSX for files with more than 65,536 rows.
    • The tool remembers your options for next time.

    Frequently asked questions

    Why does Excel remove leading zeros when opening a CSV?

    Because it reads them as numbers. This converter stores those values as text, so the zeros are kept and long numbers do not turn into scientific notation.

    Which separators does it recognize?

    Semicolon, comma, tab and vertical bar, including Excel's "sep=" line.

    Are dates converted?

    Yes. Dates such as 31/12/2026, 12/31/2026 or 2026-12-31 become real Excel dates that you can sort and filter.

    Are my files stored?

    No. The conversion happens in your browser: files are never uploaded to this site or stored on any server.

    Can I convert several CSV files at once?

    Yes, drag all the files together and download each result.

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