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About the CSV Merger

The Zadein CSV Merger combines multiple CSV files into one. It stacks the rows from each file in sequence, using the headers from the first file for the combined output — useful when consolidating data exports from multiple sources.

How to use

  1. 1Upload two or more CSV files.
  2. 2Arrange the files in the order they should be combined.
  3. 3Click Merge and download the combined CSV file.

Common use cases

  • Consolidate monthly sales reports exported as separate CSV files.
  • Combine contact lists from different sources into a single file.
  • Merge data exports from multiple accounts or regions into one dataset.
  • Join CSV files from different time periods for unified analysis.

Frequently asked questions

What happens if the CSV files have different column headers?

The tool uses the headers from the first file. Columns in subsequent files that do not match may be omitted or create misaligned data.

Is there a limit on how many files I can merge?

Multiple files can be merged in one operation. Processing time increases with the total size of the files.

Are duplicate rows removed when merging?

No. The merger combines all rows as-is. Use the CSV Cleaner tool afterwards to remove duplicates if needed.