Merge CSV Files

Combine multiple CSV files into a single export with column selection, reordering, and optional deduplication.

how to use

  • 1. Drag and drop or click to upload your CSV files in the box below
  • 2. Choose export options and sort columns if you need
  • 3. Click merge and download the result

Merge Multiple CSV Files Into One Online for Free

Merge multiple CSV files in seconds. Upload your files, pick the columns you want, and download a single clean CSV. No sign-up, no installs, just a fast workflow built for real-world data.

What you can do

  • Upload multiple CSV files at once
  • Validate that headers match before merging
  • Select columns to export or keep them all
  • Reorder columns to match your preferred output
  • Remove empty rows automatically
  • Optionally deduplicate identical rows

Export options explained

  • Unique headers: ensures header names are treated as unique identifiers.
  • Remove empty rows: skips rows with no data in the selected columns.
  • Column selection: include only the columns you need.
  • Column reordering: drag columns into the exact order you want.
  • Deduplicate rows: remove exact duplicate rows from the output.

Column manager tips

Use the column manager to keep your export clean. Toggle columns on or off, then reorder them to match downstream tools like spreadsheets, BI dashboards, or import templates.

Notes

  • Only CSV files are accepted.
  • If a file has a different header, the merge stops and shows an error.
  • The output uses the delimiter detected from the first file.

FAQ

Does this modify my original files?
No, your files stay unchanged. The merged file is generated separately.

What if my headers are not identical?
The merge will stop and display which file has the mismatch, so you can fix it or remove it.

Can I merge files with different column order?
Yes, as long as the headers match. The tool maps columns by header when unique headers are enabled.