Spreadsheet
CSV Merger
Combine multiple CSV files into one with unified headers. Add as many inputs as you need.
CSV 1
CSV 2
Merged output
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Frequently Asked Questions
Quick answers to common questions
How are headers merged?+
Headers from all files are combined. Missing columns in a row are left empty.
Do files need the same columns?+
No. The merger unions all column names across files.
Is row order preserved?+
Yes. Rows from file 1 appear first, then file 2, and so on.
Can I merge more than two files?+
Yes. Click Add CSV to include as many files as you need.
Is data sent to a server?+
No. Merging runs entirely in your browser.
What about quoted fields?+
Standard CSV quoting with commas inside quotes is supported.
Can I download the result?+
Copy the merged output or paste it into a text editor and save as .csv.
Is it free?+
Yes.