OpenCSV
/ free tool

CSV to JSON Converter

Convert CSV to JSON instantly in your browser. Free, no upload, no signup — paste your CSV and get clean JSON with headers as keys.

  • 100% free
  • Runs in your browser — nothing is uploaded
  • No signup required

CSV is how data moves between spreadsheets; JSON is how it moves between APIs and code. This converter bridges the two: paste any CSV and get a JSON array of objects, with your header row becoming the keys.

Everything runs locally in your browser — your data is never uploaded to a server, so it's safe for customer lists, financial exports, and anything else you wouldn't email to a stranger.

Example

Input
name,city
Ada,London
Grace,New York
Output
[
  { "name": "Ada", "city": "London" },
  { "name": "Grace", "city": "New York" }
]

Your data never leaves your device

Like everything at OpenCSV, this tool processes files locally in your browser. There is no upload, no server-side processing, and no copy of your data anywhere — which makes it safe for customer lists, financial exports, and other sensitive files.

/ frequently asked

Frequently Asked Questions

  • No. The conversion happens entirely in your browser with JavaScript. Nothing leaves your device.
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