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CSV to Excel Converter

Convert CSV files to Excel XLSX workbooks with typed numbers and a bold header row. Free and private.

Your files never leave your device

How to convert CSV to Excel

  1. 1

    Choose your CSV files

    Click the upload area or drag files onto it. Nothing is uploaded — files are opened locally.

  2. 2

    Start the conversion

    Press the convert button. Your browser converts the files in seconds.

  3. 3

    Download the result

    Save each file individually or everything at once as a ZIP.

Opening CSVs directly in Excel can mangle leading zeros, dates and special characters. Convert to a proper XLSX workbook to share with colleagues who live in Excel.

What is CSV?

CSV (Comma-Separated Values) stores tables as plain text, one row per line. It is the universal exchange format for spreadsheets, databases and analytics tools.

What is Excel?

XLSX is the Microsoft Excel workbook format. It supports multiple sheets and formatting, and opens in Excel, Google Sheets, Numbers and LibreOffice.

Safe for confidential files

Unlike upload-based converters, ZapMorph processes files inside your browser tab. Your documents are never transmitted, stored or logged — close the tab and they’re gone.

Frequently asked questions

Is the csv to excel converter free?

Yes. Convert 1 file a day without an account, or 5 files a day with a free account. Pro removes all daily limits.

Are my files uploaded to a server?

No. The conversion runs entirely in your browser, so your files never leave your device. We only count how many files you convert — never their names or contents.

What is the maximum file size?

Up to 25 MB per file without an account, 50 MB with a free account, and 1 GB on Pro. Very large files also depend on your device’s memory.

Can I convert multiple CSV files at once?

Yes. Select several CSV files at once — up to 5 on the free plan or 50 on Pro — and download all results in a single ZIP.

Does it work on Mac, Windows, iPhone and Android?

Yes. It works in any modern browser — Chrome, Edge, Firefox and Safari — on desktop and mobile, with nothing to install.

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