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Split Large CSV Files - Break CSV into Smaller Files

Split large CSV files into smaller chunks in your browser. Choose rows per file. processed locally in your browser and secure.

Quick start

Built for break a large file into smaller files of n rows each.

Everything runs in your browser, so you can test the workflow with sample data when available before using production files.

Output: A new file or report produced locally in your browser.

  1. 1Choose a supported file or use sample data when available.
  2. 2Set the options shown for this workflow.
  3. 3Process the file locally, inspect the result, and download a new copy.
Preparing your private workspace…

How to Split Large File

  1. 1Upload your large CSV file
  2. 2Choose how many rows per file (default: 1000)
  3. 3Download the ZIP containing all split files

Why Use This Tool?

  • ✓Handle Large Files - Process CSV files that are too big for Excel
  • ✓Custom Split Size - Choose exactly how many rows per file
  • ✓Maintains Headers - Every split file includes the header row
  • ✓ZIP Download - All files packaged conveniently
  • ✓Client-Side Processing - Your data never leaves your browser

Frequently Asked Questions

Why split a CSV file?

Large CSV files can crash Excel or Google Sheets. Splitting allows you to process data in manageable chunks, share smaller files, or meet upload size limits.

Will headers be included in each file?

Yes. Each split file automatically includes the header row, so every file is ready to use independently.

How are files named?

Files are named split_part_1.csv, split_part_2.csv, etc., making it easy to keep track of the order.

Problems this tool can help diagnose

Use the symptom-specific walkthrough before changing a production file.

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