Merge CSV Files Online

Paste two CSV files and merge them into one combined output with automatic header handling.

How to use

  1. Paste the first CSV in the top box.
  2. Paste the second CSV in the bottom box.
  3. Click Merge and copy the combined output.

Frequently asked questions

How are headers handled?

The header from the first file is kept. Duplicate headers from the second file are skipped.

Do columns need to match?

Best results when both files have the same column structure. Mismatched columns may produce uneven rows.

Can I merge more than two files?

Merge two at a time, then merge the result with a third file.

Is my CSV sent to a server?

No. Merging happens entirely in your browser.

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