CSV Merger
Drag & drop CSV files here, or click to select (batch supported)
Supported: CSV
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About the CSV Merger
The CSV Merger combines multiple CSV files into one, joining them either by stacking rows or by lining up columns. When data is spread across many exports, merging brings it together into a single file ready for analysis or import.
CSV files pile up fast — daily exports, separate sources, split datasets — and analyzing them means first combining them. Stacking rows unifies records that share the same columns, while joining columns brings related fields side by side, all without opening a database.
Merging runs entirely in your browser, so your data stays on your device. That keeps customer records, transactions, and analytics private, with no upload and no account required.
How to use the CSV Merger
- Upload the CSV files you want to merge.
- Choose whether to combine them by rows (stacking) or by columns.
- Confirm the columns line up the way you expect.
- Run the merge to produce a single combined CSV.
- Download the merged file.
Common use cases
- Stacking daily or weekly CSV exports into one continuous dataset.
- Combining records from multiple sources that share the same columns.
- Joining related columns from separate files into one table.
- Consolidating split datasets before importing them elsewhere.
Frequently asked questions
What’s the difference between merging by rows and by columns?
Merging by rows stacks files on top of each other, which suits files with the same columns. Merging by columns places fields side by side, useful when each file holds different attributes for the same records.
Do the files need the same columns?
For row merging, matching columns produce the cleanest result. The tool helps you combine the data; review the output if your files differ in structure.
Will large CSVs work?
Yes, within your device’s memory. Because processing is local, very large files depend on available resources, but typical exports merge quickly.
Is my data uploaded anywhere?
No. The merge happens in your browser, so your CSV data never leaves your device.
Can I merge CSV and Excel together?
This tool focuses on CSV. To work with Excel files, convert them to CSV first or use the Excel Merger & Splitter.