Convert CSV to JSON
Paste your CSV below and get JSON straight away. The conversion runs in your browser, so the content never leaves your device.
Converted entirely in your browser — nothing you paste here is sent to a server.
About converting CSV to JSON
CSV (.csv) content can be converted to JSON entirely in your browser — no software to install, and no account required. The conversion runs on a small in-browser text engine directly on your device.
Technical comparison
| CSV | JSON | |
|---|---|---|
| Category | data | data |
| Compression type | None (plain text) | None (plain text) |
| Typical file size | Small — scales linearly with row count | Small to moderate — slightly larger than CSV for the same data due to repeated keys |
| Transparency support | N/A (data format) | N/A (data format) |
How to convert CSV to JSON privately
Every step below runs on a small in-browser text engine inside this browser tab. Your pasted content is never uploaded to a server — there's no network request carrying it anywhere.
Paste your content
Paste text directly into the box below — it's held in this tab's memory only.
Convert locally
FreePrivateConvert converts it to JSON using a small in-browser text engine, entirely within this browser tab.
Download the result
Save your converted .json output. It only ever existed in this tab's memory — closing the tab without downloading discards it completely.
FAQ
- Is my content sent to a server?
- No. The conversion runs entirely in your browser, and nothing you paste is sent anywhere.
- Does converting CSV to JSON reduce quality?
- No. This is a text conversion, so nothing is compressed. The content is restructured into the new format exactly.
- Is there a size limit?
- Only your device's memory, since you paste the content directly. There's no account and no usage limit.
- What's the difference between CSV and JSON?
- CSV (Comma-Separated Values) and JSON (JavaScript Object Notation) store data differently. Neither is compressed: both are plain text. JSON is a lightweight, structured text format for representing objects, arrays, and nested data — the default interchange format for web APIs.
- Why convert CSV to JSON?
- Common uses for JSON: REST/GraphQL API payloads; Configuration files; Structured data export from apps and databases. Native, zero-dependency parsing in every modern language and especially JavaScript (`JSON.parse`), unlike CSV's ad-hoc parsing rules.
- What MIME type does a .json file use?
- application/json, the standard type for JavaScript Object Notation.
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