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Merge & Split CSV

Merge many CSV files into one, matching columns by name, or split a large CSV by row count, number of files or column value. Processed locally.

No uploads

How to use Merge & Split CSV

  1. 1Open Merge & Split CSV. It runs in your browser, no sign-up.
  2. 2Drop your file here or choose it. It stays on your device; nothing is uploaded.
  3. 3Adjust the options until the preview looks right.
  4. 4Download the result.

Questions

What if my CSV files have different columns?

Columns are matched by header name. Columns missing from a file are left blank, so nothing is lost.

Is the header repeated in split files?

Yes, every part gets the original header row.

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