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CSV to Excel Converter

CSV to Excel Converter turns comma-separated data into a genuine .xlsx workbook — not a renamed CSV. It parses your data, previews it as a table, and builds a real Excel file in your browser that opens cleanly in Excel, Google Sheets, Numbers and LibreOffice.

Numbers are written as numbers so Excel can sum and chart them, while identifiers with leading zeros stay as text. The delimiter (comma, tab, semicolon or pipe) is detected automatically.

How to use CSV to Excel Converter

  1. 1

    Paste your CSV

    The tool detects the delimiter and shows a live preview of the parsed table.

  2. 2

    Check the header

    Toggle 'First row is a header' so the preview labels your columns correctly.

  3. 3

    Download .xlsx

    Click Download to save a real Excel workbook with all of your rows.

A real Excel file, made in your browser

Many 'CSV to Excel' tools simply rename the file, which makes Excel show a security warning and treat every value as text. This converter instead assembles a proper Office Open XML (.xlsx) package — the same zipped XML format Excel itself writes — so the file opens without warnings.

Everything is generated locally with no uploads. Your data never leaves the browser, which matters for exports that contain customer or financial information.

Smart number and text handling

Cells that look like plain numbers are stored as numeric values, so totals, averages and charts work immediately in Excel. Values with leading zeros, such as ZIP codes or product IDs, are kept as text so they are not mangled.

Quoted CSV fields containing commas or line breaks are parsed correctly, and the first row can be treated as a header for a clean, labelled sheet.

Frequently asked questions

Is the output a real Excel file?
Yes. It is a valid .xlsx (Office Open XML) workbook, so Excel, Google Sheets, Numbers and LibreOffice all open it without warnings.
Will numbers stay numeric in Excel?
Yes. Values that look numeric are stored as numbers, while values with leading zeros are preserved as text.
Is my data uploaded?
No. The workbook is built entirely in your browser; nothing is sent to a server.

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