Free online tool
Free Online CSV to JSON Converter
Convert CSV to JSON online for free. Paste or upload your CSV data, get clean JSON output instantly. No signup required — runs entirely in your browser.
01How it works
Paste or upload your CSV
Paste CSV text directly or upload a .csv file. The converter auto-detects the delimiter.
Click Convert
The first row is used as headers. Each subsequent row becomes a JSON object with those keys.
Download or copy
Click Download to save the .json file, or Copy to paste the JSON into your code or editor.
FAQ
Frequently asked questions
What delimiters are supported?
The converter auto-detects comma, semicolon, and tab delimiters by analysing the first line. You can also paste CSV exported from Excel, Google Sheets, or any standard tool.
Does it handle quoted fields with commas inside?
Yes. The parser is fully RFC 4180-compliant and correctly handles quoted fields containing commas, newlines, and escaped double quotes.
Will numeric strings like '001' be kept as strings?
Yes. The converter does not auto-coerce values — all fields are output as strings to preserve leading zeros, phone numbers, and other formatted values exactly as they appear in the CSV.
What happens with mismatched column counts?
Short rows are padded with null values and long rows are truncated to match the header count. A note is shown when this occurs.
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