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CSV Merger: merge several CSV files into one
Upload several CSV files at once and download the merged result as a single file.
Drag and drop several CSV files here
Your file never leaves this browser.
Why use this CSV Merger?
- Columns can differ. Files with different columns merge under one combined header.
- Many files at once. Drag and drop several files in one step.
- Private by design. Your browser merges the files. Nothing uploads.
How to merge CSV files
- Upload the CSV files you want to merge.
- The merged result appears below.
- Copy the result or download it as .csv.
When you need this tool
Branches or teams send separate monthly reports, and you merge them into one annual report to analyze together.
Survey or form exports arrive one period at a time, and you combine them into one complete dataset.
Frequently asked questions
Must every file have the same columns?+–
No. The tool combines the column names from all files into one header. If a file lacks a column, its cells stay empty.
Is there a limit on the number of files?+–
No official limit. Add as many files as you need and the tool merges them into one CSV.
Do rows keep the order of the uploaded files?+–
Yes. Rows from the first file come first, then the second file, and so on.
Is my file uploaded to a server?+–
No. The entire merge runs in your browser.