Split CSV Files Online Free

To split a large CSV file online, upload it to Large CSV Viewer and choose Split from the File menu. Enter the number of rows per output file and the tool generates multiple downloadable CSV files, each with the header row preserved. Splitting runs server-side so it works on files of any size. Free, no account needed.

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Split any large CSV file into smaller parts online for free. Divide by row count or file size — no install, no account, instant download.

Need to break a large CSV into smaller, manageable pieces? Whether you're hitting upload limits, splitting data for parallel processing, or chunking a dataset for batch imports, Large CSV Viewer splits your CSV file by row count and gives you each part as a separate download — with headers preserved in every file.

Key features

  • Split any CSV by row count into N equal parts
  • Header row is preserved in every output file
  • Works on files of any size — splitting runs server-side
  • Each part downloads as a separate CSV file

How it works

  1. Upload your CSV. Open your large CSV file in the viewer. Any file size is supported.
  2. Choose split size. Open the File menu and select 'Split CSV'. Enter the number of rows per output file. The tool calculates how many files will be generated.
  3. Download your parts. Each split file downloads as a separate CSV with the original header row included. All parts together reconstruct the original dataset.

Ready to try it?

Free, instant — no account or install needed.

Open CSV Viewer →

Frequently asked questions

Why would I need to split a CSV file?

Common reasons include: upload limits in tools like Mailchimp or HubSpot, splitting data for parallel processing, chunking large exports for batch database imports, or sharing manageable subsets with colleagues.

Does each split file keep the header row?

Yes. The column header row from the original file is included at the top of every output file.

Can I split a gigabyte-scale CSV file?

Yes. Splitting runs server-side using DuckDB so it works on files of any size without crashing your browser.

Can I split by a column value instead of row count?

Row count splitting is currently supported. Splitting by column value (e.g. one file per country) is on the roadmap.

Is the CSV splitter free?

Yes, completely free. No account, no size limit, no paywall.