PrivConvert

Data tool

Merge CSV

Merge multiple CSV files with aligned headers.

Add your input

Your file stays in this browser.

Settings

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.

Next tools

Keep working with this file

Barcode GeneratorGenerate CODE-128, EAN-13, EAN-8, or UPC-A SVG barcodes.Base64 to FileDecode Base64 text into a downloadable file.Create ZIPPackage selected files into a ZIP archive.CSV to ExcelCreate an XLSX workbook from CSV data.

How it works

How to use Merge CSV online

  1. Upload CSV or text files. The tool validates the published file type and size limits before the run.
  2. 1 adjustable setting. Review these settings before processing.
  3. Run the tool in your browser, review the result, and download the csv file.

Overview

Merge CSV with local-first browser processing

Merge multiple CSV files with aligned headers. Review supported input, output format, settings, browser requirements, and practical limits before starting.

Input

Upload CSV or text files

Output

CSV file

Limits

up to 100 files · 100 MB max

Best for

Merge CSV use cases

  • Prepare the csv file for sharing, archiving, or another file workflow.
  • Process the job in your browser without creating an account.
  • Check the published limits before processing larger or unusual inputs: up to 100 files · 100 mb max.

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

Barcode GeneratorBase64 to FileCreate ZIPCSV to ExcelCSV to JSONExcel to CSV

FAQ

Merge CSV questions

See how privacy works

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?

Merge CSV uses Papa Parse in the browser. Selected files are processed locally when the required browser features are available, while application, library, model, security, and limited analytics requests may load separately.

What limits should I know about?

up to 100 files · 100 MB max. Very large, encrypted, damaged, or unusual files may not be supported by every browser.