What happens if the two files have different columns?

Matching column names are combined correctly; columns that only appear in one file are included with blank values in rows from the other file.

Does merging remove duplicate rows automatically?

No, merging just combines the rows — run the result through Remove Duplicate Rows afterward if the two files might overlap.

Can I merge more than two files?

This tool merges two at a time — for more files, merge them in successive pairs.

Does CSV Merger upload my files to a server?

No. CSV Merger runs entirely in your browser using on-device processing, your files never leave your device.

CSV Merger

Combine two CSV files into one.

Runs in your browser

First CSV

Second CSV

Skip the second file’s header row

About this tool

Combining two CSV files by hand means copying rows from one into the other and making sure the columns actually line up — easy to get wrong, especially if the column order differs between the two files. This tool merges two CSV files into one, handling the row combination directly, useful for consolidating data exported separately (like sales from two different months) into a single file for analysis.

Frequently asked questions

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