Upload two or more CSVs and combine them into a single file. Everything runs in your browser — nothing is uploaded.
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Add CSV files
0 added
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Merge
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Download
Common questions
Do the CSV files need the same columns to be merged?
No. Columns are matched by header name, and the merged file uses the union of every column across all the files — a file missing a particular column just has blank values there.
What counts as a duplicate row?
A row is only treated as a duplicate if every column matches exactly. A near-match with one different value is kept as a separate row.
Does the order of the files I upload matter?
Yes — rows appear in the merged file in the order you added the files, which also affects which copy of a duplicate row is kept first if deduplication is on.