How it works
How to use Merge CSV
- Add your file or paste the text requested by the tool.
- Adjust the available options for the result you need.
- Run the tool and download the finished output.
Data tool
Merge CSV
Merge multiple CSV files with aligned headers.
Add your input
Your file stays in this browser.
Good to knowup to 100 files · 100 MB max
Upload CSV or text filesResult: CSV file
- Your file stays in this browser while the tool runs.
- Large table previews are capped; downloads keep the complete processed output.
Privacy
Built for local-first processing
PrivConvert keeps everyday file work in the browser whenever the tool can run locally. No sign-up is required, and tool pages are generated from transparent input, output, and limit metadata.
Input
Upload CSV or text files
Output
CSV file
Limits
up to 100 files · 100 MB max
FAQ
Merge CSV questions
Is Merge CSV free to use?
Yes. This tool is free to use in your browser and does not require an account.
Are my files private?
PrivConvert is designed for local-first processing. Files are handled in your browser when supported and are not uploaded for account-based storage.
Why might a file fail to process?
Your file stays in this browser while the tool runs.