CSV Merge | Combine Multiple CSV Files Online

Consolidate split data: Combine monthly or department-level CSV exports into one file.
Combine system exports: Merge same-format CSVs exported from multiple systems.
Automatic header handling: Enable "Skip duplicate headers" to automatically remove the header row from the 2nd file onward.
Tip: Use CSV Inspect to verify each file's column structure before merging.

Drag & drop CSV files here, or click to select (multiple files allowed) CSV / TSV / TXT · Select multiple files at once

Selected files

Skip duplicate headers (treat first row of each additional file as a header)

When to merge CSV files?