Merge CSV files

Combine several CSV files into one. Columns are matched by their header name, so files with different column orders still line up. Optionally remove duplicate rows. Everything runs in your browser — nothing is uploaded.

Drop CSV files here

or click to choose — add as many as you like

Options

First row is a headerOn: match columns by header name and write one header row. Off: every file is treated as plain rows aligned by position.

Remove duplicate rowsDrop rows that are exactly identical (after column alignment), keeping the first one.

Delimiter

Everything runs in your browser. No upload, no sign-up.

How it works

STEP 1

Add your CSV files

Drop in two or more .csv files, or click to choose them. They can have different columns or column orders.

STEP 2

Set the options

Keep the header row on to align columns by name. Turn on de-dupe to drop exactly repeated rows.

STEP 3

Merge & download

Press Merge to combine everything into one table, preview it, then download the single CSV — nothing is uploaded.