CSV → JSON Converter
Paste or drop a CSV file and convert it to clean, structured JSON — with header-based keys, automatic type detection and pretty-printing. Runs entirely in your browser, so your data never leaves your device.
Input CSV
JSON output
Frequently asked questions
Is the CSV to JSON converter free?
Yes — completely free, with no account, no row limits and no watermarks.
Is my CSV data uploaded to a server?
No. The conversion runs entirely in your browser, so your data never leaves your device.
Does it use the header row as JSON keys?
Yes. When “First row is a header” is on, each column heading becomes the key in every JSON object. Turn it off to get an array of arrays instead.
Can it detect numbers and booleans?
Yes. With type detection on, values like 42 and true become a real number and boolean in the JSON — while IDs and zip codes with leading zeros are safely kept as text.
Which delimiters are supported?
Comma, semicolon and tab, with automatic delimiter detection that you can override. Quoted fields containing commas are parsed correctly.