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Nothing is uploaded. Just open it and start.

Convert CSV to JSON in your browser

Free, no sign-up, no credit card, no trial. Paste CSV or drop a file, pick your delimiter and headers, and export clean JSON — nothing is ever uploaded.

Paste or drag and drop

Paste CSV directly, or drop a .csv file onto the editor — either way it converts instantly.

Full control over the output

Choose the delimiter, headers, output format, indentation, and how empty cells are handled.

Live table & JSON preview

See the parsed rows in a table and the generated JSON with syntax highlighting, side by side.

Private & client-side

Nothing leaves your browser. No server round trip, ever.

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Frequently asked questions

How do I convert CSV to JSON?
Paste your CSV into the editor, or drag and drop a .csv file onto the drop zone. The tool validates it, converts it, and shows a live preview table and the generated JSON — click "Download JSON" or "Copy JSON" when you're happy with the result.
Does it use the first row as headers?
Yes, by default. The first CSV row becomes the object keys for every row below it. Turn off "First row is headers" to treat every row as data — rows are then keyed column_1, column_2, and so on.
What delimiters are supported?
Comma, semicolon, tab, and pipe, plus an auto-detect option that sniffs the delimiter from the file — useful for exports from spreadsheet apps or locales that use something other than a comma.
What are the output format and empty value options for?
Output format switches between an array of objects (keyed by header) and an array of arrays (raw rows). Empty values controls what happens to blank cells — keep them as empty strings, convert them to null, or omit the field entirely.
What happens if my CSV is malformed?
The tool reports the exact row and reason a row can't be parsed — for example, a row with more or fewer fields than the header — and explains it in plain language. No conversion is attempted until it's fixed.
Is anything uploaded to a server?
No. Your CSV, and the JSON generated from it, never leave your browser — nothing is uploaded or stored. It's free with no sign-up; a single unobtrusive ad slot covers hosting.

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