CSV/JSON Converter

Flip the format.

CSV to JSON. JSON to CSV. On-device.

Input
Output
No upload
Works offline
No idea what's in your data

Need to convert thousands of files? The offline bundle handles batches with no size limit. $99 once.

Get Bundle →
// How it works

Three steps. Zero uploads.

01
Paste
Paste your CSV or JSON, or drop a file. It stays on your device.
02
Convert
fwip detects the input format and converts to the other. CSV headers become JSON keys.
03
Copy
Copy the output or download as a file. Nothing was ever uploaded.
// Why this is different

Your data never leaves your machine.

Most online converters send your data to a server for processing. Your CSV or JSON passes through systems you don't control.

fwip works differently. The converter runs entirely in your browser. Your data is read from your device, processed on your CPU, and the result is saved back to your device. No server is involved. We literally cannot see your file.

No server processing

Everything runs on your device using WebAssembly. Your file never touches a network.

No account required

Drop a file. Get a result. No sign-up, no email, no password.

No subscription

Free in the browser. $99 once for the offline bundle. That's it. Forever.

Works offline

The desktop version works with no internet connection at all.

// Questions

Frequently asked.

How do I convert CSV to JSON without uploading?▾
Paste your CSV or drop a .csv file into fwip. It converts to JSON entirely in your browser. Your data never leaves your device.
Can I convert JSON back to CSV?▾
Yes. fwip converts in both directions. Paste JSON to get CSV, or paste CSV to get JSON.
Does fwip handle CSV headers?▾
Yes. The first row is automatically used as JSON keys. fwip handles quoted fields, commas in values, and multiline cells.
// Related tools

You might also need.

DATA
JSON Formatter
Format, validate, and pretty-print JSON.
 DATA
Diff Checker
Compare two texts. Line-by-line diffs.
 DATA
Base64
Encode and decode Base64 — text and files.
 DATA
Hash Generator
Generate MD5, SHA-1, SHA-256, SHA-512.
 DATA
Word Counter
Count words, characters, sentences.
 DATA
Regex Tester
Test regex with live match highlighting.

Like it? Own it.

Offline. No browser. No internet. No excuses.
$15
This tool
  • CSV/JSON Converter · offline
  • Batch processing
  • No file size limit
  • 3 devices · one payment
Join waitlist →
$99
Complete suite
  • All 200+ tools · offline
  • No file size limit
  • No daily use limit
  • 3 devices · one payment · updates included
Join waitlist →
One-time payment · 3 devices · Updates included · Mac + Windows + Linux