Merge JSONL Files Online – Free, Fast & Secure

Home » Merge JSONL Files Online – Free, Fast & Secure

Drag & Drop JSONL files here

or click to browse (Max 100MB total recommended for browser performance)

Total Lines: 0
Valid Objects: 0
Duplicates Removed: 0

Preview (First 50 lines)

About This Tool

The Merge JSONL Chunks Online tool is a powerful, client-side utility designed for data scientists, developers, and AI researchers. It allows you to combine multiple JSON Lines (.jsonl) files into a single, clean dataset without uploading your data to any server. This ensures 100% privacy and lightning-fast processing.

Why Use This Tool?

  • Privacy First: All processing happens in your browser. Your data never leaves your device.
  • Smart Deduplication: Automatically remove duplicate entries based on exact content or specific IDs.
  • Format Conversion: Easily convert your merged JSONL data into a standard JSON array or CSV format for analysis in Excel or Google Sheets.
  • Validation: Automatically skips invalid lines to ensure your output file is error-free.

How to Use

  1. Upload Files: Drag and drop your .jsonl chunks or click the upload area to select files.
  2. Configure: Choose if you want to remove duplicates and select your desired output format.
  3. Merge: Click the "Merge Files" button. The tool will process your data instantly.
  4. Download: Preview the results and download your merged file.

Tips for Best Results

For extremely large datasets (over 500MB), we recommend processing files in batches to avoid browser memory limits. If you are converting to CSV, ensure your JSON objects have a consistent structure for the best column mapping.

Frequently Asked Questions

What is a JSONL file?

JSONL (JSON Lines) is a text format where each line is a valid JSON object. It is commonly used for large datasets, logs, and streaming data because it can be processed line-by-line without parsing the entire file at once.

Is there a file size limit?

Since this tool runs in your browser, the limit depends on your computer's available RAM. We generally recommend keeping total input under 500MB for smooth performance.

Can I convert JSONL to CSV?

Yes! Simply select "CSV" from the Output Format dropdown before merging. The tool will flatten your JSON objects into rows and columns.

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