JSONL to CSV Converter
Convert JSON Lines (JSONL) to Comma-Separated Values (CSV) online for free. Runs 100% in your browser. Files never leave your device. No signup, no watermarks, no limits.
Drag & drop files or Browse
Processed on your device. Nothing is uploaded
Automate this. An open tab can convert whole folders via the Local API — still zero uploads.
Local API →How to use JSONL to CSV Converter
- 01Add files
Choose files or drop them here
- 02Settings
Settings · Runs on your device
- 03Download
Processed on your device. Nothing is uploaded
What is a JSONL (JSON Lines) file?
JSON Lines (JSONL / NDJSON) stores one JSON object per line, which makes it ideal for logs, streaming datasets and machine-learning training data.
- Developed by
- jsonlines.org
- Initial release
- 2013
What is a CSV (Comma-Separated Values) file?
CSV is the simplest spreadsheet interchange format. One row per line, values separated by commas. Every spreadsheet app and programming language can read it.
- Developed by
- Unknown
- Initial release
- 1972
Frequently asked questions
How do I convert JSONL to CSV?
Click “Choose Files” or drag your JSONL file onto the page, optionally adjust the settings, then hit Convert. Your CSV file downloads straight from your browser. Nothing is uploaded anywhere.
Is this JSONL to CSV converter free?
Yes, completely free with no hidden limits, watermarks or signup. Because all processing happens on your own device, there are no server costs to pass on to you.
Are my files uploaded to a server?
No. The conversion engine runs entirely in your web browser using WebAssembly. Your files never leave your device. You can even disconnect from the internet after the page loads and keep converting.
Is there a file size limit?
We impose no fixed limit. The practical ceiling is your device's free memory, since processing happens locally. Most conversions work comfortably with files up to a few hundred megabytes, and image or document conversions handle much more.
Does it work on my phone?
Yes. The converter runs in any modern browser on Windows, macOS, Linux, Android and iOS. No app installation is required.