# CSV Dataset Merger

Append two CSV datasets with exactly matching header order.

[Open this tool](https://whatson.pk/developer-csv-merge-calculator/)

Category: Developer & Data

Appending datasets is appropriate when both files describe the same columns in the same sequence.

Check both headers before combining records, then review the output row count.

## Inputs and controls

* CSV one
* CSV two
* Input separator: Comma; Tab; Semicolon; Pipe
* Duplicate rows: Keep every row; Keep first identical row
* CSV export values: Protect spreadsheet formula cells; Preserve raw machine values

## How to use

* Paste or enter CSV one.

* Paste or enter CSV two.

* Choose input separator, duplicate rows and CSV export values.

* Select Process input. Read the returned values alongside the assumptions below before copying, exporting or acting on the result.


## Why use this tool

Strict matching avoids guessing which differently ordered fields belong together.


## Before relying on the result

This appends records. It does not join by a key or guess mismatched columns.


## Tool limitations

This appends records. It does not join by a key or guess mismatched columns.

## Questions

### Is this a join by customer or product key?

No. It appends rows. Key based joins require a separate operation.

### What should I check before using CSV Dataset Merger?

Check CSV one, CSV two, Input separator and Duplicate rows. Use the exact units shown beside the controls and replace any example values with your own inputs.

Source page last modified (UTC): 2026-10-04T16:58:29+00:00

This profile describes the tool. It does not execute it or supply a professional certification.