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CSV ↔ JSON

Convert between CSV and JSON locally.

About this tool

Convert between CSV and JSON, and pretty-print or filter rows. Detects delimiter and handles quoted fields correctly.

Features

  • CSV ↔ JSON
  • Auto-detect delimiter
  • Header row toggle
  • Local

How to use it

  1. Paste CSV or JSON.
  2. Pick the conversion direction.
  3. Copy or download the result.
🔒 100% private

Everything happens inside your browser using JavaScript and WebAssembly. Your files are never uploaded to a server, never stored, and never seen by us.

Frequently asked questions

Does it handle multi-line cells?

Yes - quoted fields with embedded newlines are parsed correctly.