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CSV to JSON Converter Online Free — PrivaTools

TL;DR: Paste CSV or JSON and instantly see the other format — round-trippable, runs in your browser.

Convert CSV to JSON online for free — upload a CSV spreadsheet and get a properly formatted JSON array. Also supports JSON to CSV. Perfect for data transformation.

Using CSV to JSON Converter doesn't require an account, an email address, or a paid plan. Your file is held in temp memory only for the duration of processing, then permanently unlinked. No watermarks, no upsells, no behavioural tracking.

How to Use CSV to JSON Converter

  1. Paste your CSV or JSON — Or upload a file. Auto-detects the format.
  2. Click Convert — CSV → JSON: each row becomes an object using the first row as keys. JSON → CSV: array of objects → rows; keys → header.
  3. Copy or download the result — Runs entirely in your browser. Your data never leaves your device.

Frequently Asked Questions

How does CSV escaping work?

Standard RFC 4180: commas in values must be quoted; quotes inside values are doubled (""). PrivaTools handles both.

What about nested JSON?

Nested objects are flattened to dot-notation columns (user.name, user.email) for CSV output. Reverse direction reconstructs the nesting.

Will my data be uploaded?

No — pure-browser conversion. No data leaves your machine.

Last reviewed 2026-05-01 by the PrivaTools maintainers. Source code on (MIT-licensed, self-hostable).

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