Merge and Clean Excel and CSV Files - Adawa.at

Merge the first sheet from XLSX, CSV, and TSV files into one Excel workbook with union headers and duplicate cleanup.

How to use this tool

  1. Add XLSX, CSV, or TSV files with a header row.
  2. Choose cleanup rules and an optional duplicate-key column.
  3. Review the preview and download the combined XLSX file.

Frequently asked questions

How are different columns handled?

A union header is created and missing values remain blank.

Are Excel formulas preserved?

Only cached values are read; formulas and formatting are not preserved.