How it works
How to use Merge CSV online
- Choose the file or files requested by the tool.
- Adjust any available settings for the output you want.
- Run the tool in your browser and download the finished result.
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.
Overview
Merge CSV for private browser work
Merge multiple CSV files with aligned headers. This page keeps the input, output, browser requirements, and practical limits visible before you run the tool, so you can choose the right workflow for the file.
Input
Upload CSV or text files
Output
CSV file
Limits
up to 100 files · 100 MB max
Best for
Merge CSV use cases
- Turn upload csv or text files into csv file without creating an account.
- Run a quick merge csv job before sharing, archiving, or publishing a file.
- Check the up to 100 files · 100 mb max guidance before using larger or unusual inputs.
Processing
What happens in your browser
PrivConvert uses Papa Parse for this workflow. 1 adjustable setting. No special browser capability is required for typical inputs
Your file stays in this browser while the tool runs.
Related tools
Keep working with this file
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.