CSV Merger
Choose up to 10 local CSV files. The merger checks exact parsed headers, then appends all rows in file order.
Up to 10 files, 5 MB each. Headers must match exactly.
A QUICK WALKTHROUGH
How to use this tool
- Choose up to 10 CSV files, each no larger than 5 MB.
- Review the exact-header check and row count.
- Download or copy the merged CSV.
Exact headers and all rows
Every file must have the same parsed header cells in the same order. The first header is emitted once, then every data row is appended in selected file order. Rows are never deduplicated.
Bounded local processing
Select at most 10 files, each up to 5 MB. Quoted fields may contain commas, quotes, and line breaks; CSV is parsed and generated in this browser only.
GOOD TO KNOW
Common questions
Are duplicate rows removed?
No. Every data row from every accepted file is retained.
What if one header differs?
The merge stops and identifies the mismatch; no partial result is produced.
Are files uploaded?
No. Files are read and merged locally in your browser.