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Convert CSV to JSON

Convert CSV rows into a JSON array in your browser. The delimiter is detected automatically, quoted commas and line breaks are handled correctly, and the result appears in a preview you can copy or download without uploading the data.

Files are converted on your device and never uploaded.

Price
Free
Uploads
None, it runs on your device
Sign-up
Not needed
Batch
Unlimited files
Output
JSON with a preview
Install
Nothing to install

How it works

How to convert CSV to JSON

  1. Add your CSV files

    Drop CSV files onto the converter, click to choose them, or paste from the clipboard. Add as many as you like.

  2. Check the settings

    JSON is already selected. The result appears in a preview you can copy, or download it as a file.

  3. Download your JSON files

    Copy the result from the preview, or download it. With several files, Download all saves them in one ZIP file.

The formats

CSV and JSON at a glance

  • What is a CSV file?

    CSV stores a table as plain text, one row per line, with commas between the columns. Almost every spreadsheet, database, and analytics tool can import and export it, which makes it the default format for moving data between systems. It has no formatting, formulas, or multiple sheets. It opens in Excel, Google Sheets, Numbers, LibreOffice Calc, any text editor, and practically every database and programming language.

  • What is a JSON file?

    JSON is a text format for structured data made of objects, arrays, strings, numbers, and true or false values. It's the standard format for web APIs and config files, and every programming language can read it. Nested data doesn't map directly onto a flat table. It opens in any text editor, VS Code, browsers, and every programming language.

Good to know

What changes when you convert CSV to JSON

  • The first row is used as column names, and the delimiter is detected automatically, so semicolon-separated files from European versions of Excel work too.
  • Each row becomes a JSON object. Numbers and true or false values become real JSON numbers and booleans.
  • Very large files, in the hundreds of megabytes, may be slow, and the preview shows only the beginning.

FAQ

Questions, answered

How are CSV headings used in JSON?

The first CSV row becomes the property names, and each following row becomes one object. Empty cells are retained as empty values so columns remain aligned.

Is this CSV to JSON converter free?

Yes. It's completely free, with no sign-up, no watermark, and no limit on how many files you convert. It costs Ethical Tube nothing to run, because the conversion happens on your own device rather than on a server.

Are my files uploaded anywhere?

No. The conversion runs inside your browser with open-source CSV, JSON, YAML, XML, and Excel libraries, so your files never leave your device. Once the page has loaded, it even works offline.

Can I paste CSV instead of uploading a file?

Yes. Paste CSV text onto the page and it's converted the same way. Nothing you paste leaves your browser.

Can I convert several CSV files at once?

Yes. Add as many as you like. They're converted one after another, and you can download each JSON file as soon as it's ready or all of them in one ZIP file.

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

Yes. It works in Chrome, Edge, Firefox, and Safari, on computers and phones.

What can open a JSON file?

Any text editor, VS Code, browsers, and every programming language.

Is there a file size limit?

There's no upload limit because nothing is uploaded. The practical limit is your device's memory: everyday files are fine, and most computers handle files of a few hundred megabytes.

Keep converting

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