Convert CSV to JSON Online | Free & Secure
Convert CSV files to JSON online with custom delimiters, headers, and large-file support. Secure client-side conversion with no upload required.
Paste or upload CSV data and this tool instantly converts each row into a JSON object, using the first row as keys. It outputs a clean array of objects, auto-detects delimiters, handles quoted fields and embedded commas, and lets you skip empty lines. Everything runs in your browser, so your files are never uploaded to a server.
CSV Input
Upload CSV
JSON result will appear here...
How to Convert CSV to JSON
Paste your CSV data or upload a CSV file.
Configure options like headers and empty lines.
The tool automatically converts CSV rows to JSON objects.
Copy or download the JSON output.
Key Features
Client-Side Processing
Your CSV is parsed directly in your browser. No data is sent to any server.
Smart Parsing
Automatically detects delimiters and handles quoted fields correctly.
Flexible Output
Choose whether to treat the first row as headers or generate a simple array of arrays.
FAQ
Is this tool free?
Yes, this CSV to JSON converter is completely free to use.
Can I convert large files?
Yes, since the processing happens in your browser, you can convert relatively large files without uploading them to a server.
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Paste or upload CSV data and this tool instantly converts each row into a JSON object, using the first row as keys. It outputs a clean array of objects, auto-detects delimiters, handles quoted fields and embedded commas, and lets you skip empty lines. Everything runs in your browser, so your files are never uploaded to a server.
How to Convert CSV to JSON
- 1
Paste or upload your CSV
Enter CSV text in the input box or upload a .csv file. Comma, tab, and semicolon delimiters are detected automatically.
- 2
Configure parsing options
Choose whether the first row is a header (object keys) and whether to skip empty lines for a cleaner result.
- 3
Convert to JSON
Click Convert to JSON. Each CSV row becomes a JSON object, or an array of arrays when no header is used.
- 4
Copy or download
Use Copy to send the JSON to your clipboard, or Download to save it as a .json file.
References
- RFC 4180 — Common Format and MIME Type for CSV Files
The IETF specification defining CSV structure, header rows, quoting, and how embedded commas and line breaks are escaped.
- RFC 8259 — The JavaScript Object Notation (JSON) Data Interchange Format
The IETF specification for the JSON format produced by this converter, covering objects, arrays, strings, and number rules.
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Frequently Asked Questions
- Is this tool free?
- Yes, this CSV to JSON converter is completely free to use, with no sign-up or usage limits.
- Can I convert large files?
- Yes. Since the processing happens entirely in your browser, you can convert relatively large files without uploading them to a server.
- How are CSV headers turned into JSON?
- When the Header Row option is enabled, the first CSV row is used as the object keys and every following row becomes a JSON object mapping those keys to its values. With headers disabled, the output is a plain array of arrays.
- Does it handle quoted fields and commas inside values?
- Yes. The parser follows RFC 4180 quoting rules, so commas, line breaks, and double quotes inside a quoted field are preserved correctly instead of splitting the column.
- Is my CSV data sent to a server?
- No. All parsing runs locally in your browser, so your CSV data never leaves your device.