Free CSV merger
Merge CSV files online, instantly
Combine several CSV files into one clean file in seconds. No Python scripts, no command line, and nothing gets uploaded.
Files are processed in your browser. Nothing is uploaded.
How it works
- Step 1
Add your CSVs
Drag in any number of CSV files, even with different column orders.
- Step 2
Columns line up
Headers are matched by name and each row keeps its source file.
- Step 3
Export one file
Download a single combined CSV or keep exploring with AI.
An online CSV merger that doesn't upload
Online CSV mergers usually send your files to a server and send back the result. This one runs in your browser: the files are read from your disk into the page, merged in memory and downloaded straight back. You can even disconnect from the internet after the page loads.
Step-by-step guides
Frequently asked questions
How do I combine multiple CSV files into one?
Drop them in the box above and click Download CSV. That's it.
Do I need Python or Excel?
No. Everything happens in your browser.
Is there a file size limit?
It depends on your device's memory; files of hundreds of thousands of rows usually work fine.
Are my CSV files private?
Yes. They are processed locally and never uploaded.
Go beyond combining
Connect Google Sheets and Excel, link related data and ask questions in plain language.
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