Free CSV Merger
Combine multiple CSV files into one. Columns are matched by name, so reordered or missing columns won't corrupt your output.
Local processing
Drop CSV files here
or click to browse · CSV up to 50MB each · multiple files supported
Frequently Asked Questions
Can I merge CSV files with different columns?
Yes. The merger matches columns by name, not position — so a file with columns in a different order still merges correctly. Columns missing from a given file are filled with empty cells for its rows.
Does the tool preserve headers?
Yes. The merged output has one header row containing every unique column name found across all uploaded files.
Are my files uploaded to a server?
No. Files are parsed and merged entirely in your browser.
What happens with incompatible or invalid files?
If a file isn't a valid CSV or is empty, you'll get a clear, specific error instead of a corrupted merge.