JSON to JSONL Converter

Convert standard JSON arrays to JSON Lines (JSONL) format for Fine-Tuning (OpenAI/Mistral).

100% BROWSER-BASED

Input JSON Array

Output JSONL

/ HOW TO USE

How to Use JSON to JSONL Converter

This tool runs entirely in your browser. Upload your file, make your changes, and download the result. Your files never leave your device — everything is processed locally for maximum privacy.

/ FEATURES

Key Features

100% Client-Side Processing

No File Size Limits

Completely Free

Privacy Focused

Instant Results

Works Offline

/ YOUR PRIVACY

Your Privacy is Guaranteed

Unlike other tools that upload your files to servers, ToolBox processes everything locally in your browser.

No server uploads

Instant processing

Works offline