CSV Merger
Merge two CSVs by unioning their columns and stacking all rows, filling gaps. Free, private, in your browser — copy or download the merged file.
Merge two CSVs
Paste two CSVs. We union the columns and stack all rows, filling gaps.
What this CSV merger does
Common use cases
- 1Combining two exports
- 2Stacking monthly data files
- 3Merging lists with different columns
- 4Consolidating team spreadsheets
- 5Appending new records
- 6Building one dataset from many
Related tools
About merging CSV files
Combining two CSVs by hand is fiddly when they have different columns. This merger reads both files, builds a union of all columns, and stacks every row underneath — leaving blanks where a file didn't have that column.
The result is a single clean CSV you can copy or download. It all runs in your browser, so even confidential data never leaves your device. To remove any duplicates the merge creates, follow up with the CSV Deduplicator.
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Got Questions? We Have Answers.
What if the two files have different columns?
It builds a union of all columns from both files and stacks every row, leaving blanks where a file didn't have that column.
Is my data uploaded?
No. Merging happens entirely in your browser.
How do I remove duplicates the merge creates?
Run the merged output through the CSV Deduplicator.
Does column order matter?
No — columns are matched by header name, not position.