Combine multiple CSV files into one with unified headers. Add as many inputs as you need.
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Quick answers to common questions
Headers from all files are combined. Missing columns in a row are left empty.
No. The merger unions all column names across files.
Yes. Rows from file 1 appear first, then file 2, and so on.
Yes. Click Add CSV to include as many files as you need.
No. Merging runs entirely in your browser.
Standard CSV quoting with commas inside quotes is supported.
Copy the merged output or paste it into a text editor and save as .csv.
Yes.
Your data is processed entirely in your browser. Nothing is sent to any server.