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CSV Splitter

Split a large CSV file into smaller chunks by row count. Each chunk automatically includes the header row. Download parts individually or all at once.

📂 Drop a CSV file here or

About CSV Splitter

The CSV Splitter divides a large CSV file into multiple smaller files, each containing a specified number of rows. Every chunk automatically includes the original header row, so each part is a standalone, valid CSV file.

Common Use Cases

  • Uploading large CSV files to services that have row-count limits (e.g. email marketing platforms, CRMs).
  • Processing large datasets in batches in your scripts or pipelines.
  • Sharing subsets of data with team members without sending the entire file.

How to Use

  1. Upload a CSV file or paste CSV text.
  2. Set the Rows per file (e.g. 1000) to split by count, or choose a Split column to split by value.
  3. Click Split - the tool generates the split parts.
  4. Download each part individually or as a ZIP archive.

How It Works

For row-count splitting: the header row is copied to each output file, then data rows are distributed in chunks of the specified size. For value-based splitting: unique values in the chosen column group rows into separate files.

Example

A 50,000-row customer export that needs to be split for a mail merge tool that accepts max 5,000 rows per file: set rows per file to 5000 and download 10 separate CSVs in one click.

FAQ

Yes. The first row of your CSV is treated as the header and is prepended to every chunk, so each file is independently usable.
No. All splitting happens in your browser using JavaScript. Your file is never sent to a server.
Yes - use the "Download All Chunks" button to trigger downloads for every chunk. Note that browsers may prompt for permission to download multiple files.