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Merge CSV Files

Combine CSV files into one spreadsheet-ready CSV in the browser.

Local converter

Processed in your browser. Files do not leave your device.

CSV merge options
No file selected.

Overview

Merge CSV combines multiple CSV exports into one downloadable CSV. This preview uses the shared browser-local worker path, union header handling, row limits, and spreadsheet formula neutralization already proven by the P0 data tools.

Use Cases

  • Combine exports from the same system before cleaning or deduplicating rows.
  • Merge CSV files with overlapping but not identical columns into a single header set.
  • Prepare browser-local CSV output for spreadsheet review or JSON conversion.

Limitations

  • This preview accepts CSV files with header rows and merges rows in selected-file order.
  • Headers are combined into a union set, and missing cells are left blank in the output.
  • File count, rows, columns, and cell sizes are capped before merged output is prepared.

FAQ

Does this CSV merger upload my files?

No. The selected CSV files are read by the browser and processed through a local worker for this preview tool.

What happens when files have different columns?

The output uses the union of headers in first-seen order. Rows from files without a column leave that cell blank.

Remove Duplicate Rows

Keep the first copy of each CSV row and remove later duplicates.

Remove Empty Rows

Delete blank CSV rows while keeping real data in order.

CSV to XLSX

Create an Excel workbook from CSV rows in the browser.

XLSX to CSV

Extract worksheet rows from an XLSX workbook as CSV.

CSV to JSON

Turn CSV rows into structured JSON objects.

JSON to CSV

Turn arrays or objects into spreadsheet-ready CSV.

TSV to CSV

Turn tab-separated rows into spreadsheet-ready CSV.