Free Online CSV to JSON Converter
Convert your CSV data into clean JSON format instantly. Paste any CSV content and get formatted JSON output with automatic type detection. Custom delimiters, quoted field support, and more. No uploads, no servers, 100% private.
Processed entirely in your browser · No data uploaded
How to Use the CSV to JSON Converter
Paste Your CSV
Copy your CSV data from any source — Excel, Google Sheets, or database exports. Paste it into the input editor. The first row should contain your column headers.
Configure Options
Choose your delimiter (comma, semicolon, or tab) and toggle options like auto type formatting and quoted field support. The JSON output updates in real-time.
Copy or Download
Copy the formatted JSON to your clipboard or download it as a .json file. Ready to use in your applications, APIs, or data pipelines.
Powerful CSV to JSON Conversion Features
Everything you need to convert CSV data to JSON — all in one free tool.
Instant Conversion
See your CSV data converted to JSON in real-time as you type or paste. No buttons to click — just paste and go.
Auto Type Detection
Numbers, booleans, and strings are automatically detected and converted to the correct JSON types. '30' becomes 30, 'true' becomes true.
Custom Delimiters
Support for comma, semicolon, and tab-delimited CSV files. Perfect for different regional formats and data sources.
Quoted Field Support
Handle CSV fields with embedded commas, quotes, and newlines. Fully supports RFC 4180 quoted field standards.
Copy to Clipboard
Copy the formatted JSON output to your clipboard with a single click. Ready to paste into your code or documentation.
Download as File
Download your converted JSON as a .json file. Perfect for saving data for use in applications and data pipelines.
Syntax Highlighting
Color-coded keys, strings, numbers, and booleans make the JSON output easy to read and verify at a glance.
100% Client-Side
All processing happens in your browser. Your data never leaves your device — no uploads, no servers, no privacy concerns.
Why Use Our CSV to JSON Converter
The simplest, fastest way to convert CSV to JSON online. No sign-up, no limits, no data leaving your browser.
100% Free
No hidden fees, no premium plans, no usage limits. Convert as much CSV data as you need, as often as you want.
Privacy First
Your data never leaves your browser. Everything is processed locally — no server uploads, no data logging.
Smart Type Detection
Automatically converts numeric strings to numbers and 'true'/'false' to booleans. No manual post-processing needed.
Developer-Friendly
Clean, formatted JSON output ready to use in any application. Handles complex CSV files with quoted fields and custom delimiters.
Key Highlights
- No sign-up or registration required
- Processes everything in your browser — zero server uploads
- Auto-detects and converts data types (numbers, booleans)
- Supports comma, semicolon, and tab delimiters
- Handles quoted fields with embedded commas and newlines
- Works on any device — desktop, tablet, or mobile
Frequently asked questions
What is a CSV to JSON converter?
A CSV to JSON converter transforms CSV (Comma-Separated Values) data into JSON (JavaScript Object Notation) format. CSV is commonly used by spreadsheets like Excel and Google Sheets, while JSON is the standard format for web APIs, databases, and JavaScript applications.
Is this CSV to JSON converter really free?
Yes, completely free. There are no hidden charges, no usage limits, and no premium features locked behind a paywall. Use it as much as you need, whenever you need it.
Is my data secure?
Absolutely. All conversion happens entirely in your browser using JavaScript. Your data is never sent to any server, stored, or logged. This means sensitive information stays completely private.
What delimiter options are available?
You can choose between comma (,), semicolon (;), or tab as your delimiter. Comma is the standard for most CSV files, semicolons are commonly used in European formats, and tabs are useful when your data contains commas.
How does automatic type detection work?
The tool automatically detects and converts values to their correct JSON types. Numeric strings like '42' become the number 42, 'true'/'false' become booleans, and quoted strings remain as strings. This saves you from having to manually convert types after conversion.
Can it handle quoted fields with commas inside?
Yes. When quoted field support is enabled, fields wrapped in double quotes can contain commas, newlines, and other special characters. For example: 'Smith, John' is treated as a single field value.
Does the first row need to be headers?
Yes, the converter expects the first row of your CSV to contain column headers. These headers become the key names in the resulting JSON objects. If your CSV doesn't have headers, you may need to add them first.
Do I need to install anything?
No installation required. The CSV to JSON converter works entirely in your web browser. Just open the page and start converting. No downloads, no plugins, no setup.
Can I use this on my phone?
Yes, the tool is fully responsive and works on all devices — desktops, tablets, and smartphones. The interface adapts to your screen size for comfortable use anywhere.