CSV ↔ JSON Converter

Convert files between CSV and JSON formats
For very large JSON files, this may be memory-intensive
Files are processed locally - no data is stored
Download links expire after 1 hour

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Conversion Progress

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How It Works

Upload

Upload your CSV or JSON file. The converter automatically detects the file type based on its content.

Process

Files are processed locally in your browser using efficient streaming for CSV files and chunk processing for JSON files.

Convert

Download your converted file immediately. No data is stored on our servers.

File Size Guidelines

CSV to JSON

Input CSV: Up to 100MB recommended
Output JSON size typically 1.5-2x larger than input CSV
Example: 10MB CSV → ~15-20MB JSON

JSON to CSV

Input JSON: Up to 50MB recommended
Output CSV size typically 0.5-0.7x of input JSON
Example: 10MB JSON → ~5-7MB CSV

Example Output

CSV Input

name,age,city
John Doe,30,New York
Jane Smith,25,London
Bob Johnson,45,Paris

JSON Output

[{
  "name": "John Doe",
  "age": "30",
  "city": "New York"
}, {
  "name": "Jane Smith",
  "age": "25",
  "city": "London"
}, {
  "name": "Bob Johnson",
  "age": "45",
  "city": "Paris"
}]