Our Data Splitter is a fast and simple tool designed to help you handle massive spreadsheets that are too big for Excel or other apps. Whether you need to split a 100MB CSV file into smaller parts, extract specific columns, or divide a JSON list into equal chunks, this tool does it all in seconds. Your data stays completely private since everything happens locally in your browser.

Key Features & Benefits

Four Flexible Methods

Split your data vertically (by rows), horizontally (by columns), or by setting a specific target file size in KB.

One-Click ZIP Download

Don't waste time saving files one by one. We package all your new data chunks into a single ZIP archive for you.

Smart Header Preservation

Every file we create keeps the original headers at the top, so they're ready to be used or imported immediately.

Secure Local Processing

We never see your files. All splitting happens entirely on your own device, so your data remains 100% private.

How to Use the Large Data Splitter - Split CSV & JSON Files Online

Upload Your Data

Import your large CSV or JSON file. You'll see a quick preview of the first few rows to make sure everything looks right.

Choose Your Method

Select how you want to split your data: by row count, number of files, specific columns, or total file size.

Set Your Limits

Enter your requirements, like '1,000 rows per file' or 'split into 10 separate files', and click Execute.

Download as ZIP

Once the split is finished, you can download your new files individually or save them all at once in a single ZIP folder.

Practical Use Cases

Email Marketing

Split a massive list of 250,000 contacts into smaller batches of 10,000 to meet upload limits for your email provider.

Database Imports

Break down huge data dumps into smaller chunks so you can import them into your database without timing out.

Cleanup sensitive data

Use the 'By Columns' feature to separate sensitive private info from your main dataset before sharing it with your team.

GitHub File Limits

Avoid the 100MB limit on GitHub by automatically splitting your large data files into smaller 50MB segments.

FAQs

How do I split a large dataset?

Upload your file, select a split method (rows, chunks, etc.), and download the segments.

Is my data secure?

Yes, all processing is client-side in your browser.