Free Secure CSV Converter

Free, secure CSV converter. Convert CSV to JSON or Excel (XLSX) in your browser. Nothing is uploaded—your data stays on your device.

Drop CSV file or click to browse

Supported CSV conversions
  • CSV → JSON
  • CSV → Excel (XLSX)

Files are processed locally in your browser. Nothing is uploaded to a server.

Free, secure CSV converter

Free, secure CSV converter. Convert CSV to JSON or Excel (XLSX) in your browser. Nothing is uploaded—your data stays on your device. This free, secure CSV converter runs entirely in your browser—no account required and no watermarks on your output.

Convert CSV to JSON for APIs and scripts, or to Excel (XLSX) for spreadsheet apps. Every operation stays on your device.

How it works
  1. Upload a CSV file using the drop zone or file picker.
  2. Choose an output format: JSON or Excel (XLSX).
  3. Click Convert, then download your result. Nothing is uploaded to a server.
Supported CSV conversions
  • CSV → JSON — Convert CSV to JSON with structured row objects—ideal for APIs, scripts, and web apps.
  • CSV → Excel (XLSX) — Convert CSV to Excel (XLSX) for opening in Microsoft Excel, Google Sheets, or LibreOffice.
Secure and private

Your CSV files are processed locally in your browser. Nothing is stored on a server and nothing is uploaded over the network. That makes this tool a good fit for spreadsheets, exports, and other sensitive data you do not want to send to a third-party service.

Frequently asked questions

Is this CSV converter free?

Yes. Every conversion is free with no account, watermark, or usage limit.

Is this CSV converter secure?

Yes. Files are processed locally in your browser. Nothing is uploaded to a server, so your data stays on your device.

What formats can I convert CSV to?

You can convert CSV to JSON for developers and APIs, or to Excel (XLSX) for spreadsheet apps.

Does the converter handle commas and quoted fields?

Yes. The parser handles standard CSV quoting and delimiters so rows with commas inside quoted cells convert correctly.

Does the converter work on mobile?

Yes. It runs in modern mobile browsers that support HTML5 and JavaScript. Very large files may be slower on mobile devices.

What is the maximum file size?

Each file can be up to about 50 MB. If a file is too large, you will see a clear error message asking you to use a smaller file.

Why did my conversion fail?

Common causes are a non-CSV file, invalid or corrupted CSV data, or exceeding the size limit. Check the message below the converter for specific guidance, then try again or refresh the page.

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