Split JSONL / NDJSON File Online

Free online JSONL splitter - split NDJSON files

Convert directly in your browser, with no upload waiting time, and no risk of data leaks.

Simply choose your JSONL file, pick a split method, and download the parts!

Choose a JSONL File to Split

JSONL (NDJSON, LDJSON) File:
(Max 50M.)
(Big then 50M?)

or drag & drop the JSONL file here

Split method:

Lines per file:

Number of parts:

Size per file (KB):

Download all parts as ZIP file

How to Split JSONL (3 Steps)

Choose your JSONL file. Select a .jsonl or .ndjson file up to 50M.
Pick a split method. Choose lines per file or the number of equal parts.
Download the parts. Every part is valid JSONL and can be processed on its own.

Online vs App

Same job, two ways — pick the one that fits your file:

	Online	App
Free	✓	Trial
No install	✓	—
No upload	✓	✓
Large files / batch	✗	✓
GUI	✓	✓
CLI	—	✓

In short: this page is best for a quick, small file. For large files or batch jobs, use the BigTextFileSplitter desktop app — it also ships a command line for scripts and scheduled runs.

What to Know About JSONL

Each output file contains complete JSON objects, one per line.
Splitting happens between lines, so no JSON object is broken.
Parts are numbered in order.
The file is processed in your browser and never uploaded.

Frequently Asked Questions

Is each part still valid JSONL?

Yes. Every part is a valid JSON Lines file containing whole JSON objects.

Can I split by size?

The online tool splits by line count or number of parts; split by line count if you need a target size.

Is my data uploaded?

No, the split is local.

Need bigger files or batch conversion?

If this service cannot split your data correctly, or your file is big than 50M, you can split JSONL file locally by this App: Big JSONL File Splitter, for Windows, Linux, and macOS.

Want to stay in the browser? Subscribe (from $5/month) to raise the online limits.

If you have any question or suggestion, please contact us.

Split JSONL Files Online