# CSV File Merger

Merge multiple CSV files into a single file with options for header handling and deduplication

> Canonical page: https://elysiatools.com/en/tools/csv-merger

- **Category:** Data Processing

- **Keywords:** csv, merge, combine, concatenate, files, data

## Overview

The CSV File Merger is a streamlined utility designed to combine multiple CSV files into a single, unified document, offering flexible controls for header management, data deduplication, and custom output formatting.

## Inputs

- **CSV Files** (file): Select CSV files to merge...
- **Header Handling** (select)
- **CSV Separator** (select)
- **Output Format** (select)
- **Remove Duplicates** (select)

## When to use

- When you need to consolidate monthly or regional reports into a single master data file.
- When you want to remove redundant rows across multiple datasets to ensure data integrity.
- When you need to standardize the format or separator of disparate CSV files for easier analysis.

## How it works

- Upload your CSV files using the file selector.
- Choose your preferred header handling method and set the appropriate CSV separator.
- Toggle the deduplication option if you need to remove identical rows.
- Download your merged file in your chosen CSV or TSV format.

## Use cases

- Consolidating fragmented sales logs from different regional branches into one master spreadsheet.
- Merging multiple exported survey results into a single dataset for statistical analysis.
- Cleaning up combined datasets by automatically removing duplicate entries across multiple source files.

## Frequently asked questions

### How many files can I merge at once?

You can upload and merge up to 5 CSV files in a single operation.

### What happens if my files have different headers?

You can choose to use only the first file's headers, merge all unique headers, or include all headers including duplicates.

### Can I change the output format to TSV?

Yes, you can select TSV (Tab Separated) as the output format in the settings.

### Does the tool support different separators like semicolons?

Yes, the tool supports comma, semicolon, and tab separators to match your source files.

### Is there a file size limit?

The total size for all uploaded files must not exceed 50 MB.

## Related tools

- [XLSX CSV Batch Converter](https://elysiatools.com/en/tools/xlsx-csv-batch-converter): Batch convert CSV/TSV to XLSX or convert XLSX back to CSV/TSV with delimiter and encoding handling
- [CSV / Excel Diff Tool](https://elysiatools.com/en/tools/csv-excel-diff-tool): Compare two CSV or XLSX datasets and export a PDF report with row, column, and cell-level differences
- [JSON-LD Generator from CSV](https://elysiatools.com/en/tools/json-ld-generator-from-csv): Turn CSV or Excel rows into Schema.org JSON-LD for articles, products, or events, with validation-ready output for SEO workflows
- [Barcode Batch Generator](https://elysiatools.com/en/tools/barcode-batch-generator): Batch generate Code 128, EAN-13, UPC-A, ITF-14, QR Code, and Data Matrix outputs from CSV or multiline text
- [Time Series Forecast & Seasonality Analyzer](https://elysiatools.com/en/tools/time-series-forecast-seasonality-analyzer): Forecast future periods from CSV or JSON time-series data and inspect trend, seasonal, and residual decomposition in one report
- [XLSX CSV Detect Normalize](https://elysiatools.com/en/tools/xlsx-csv-detect-normalize): Auto-detect CSV delimiter/encoding (UTF-8/GBK), normalize the table, and import to XLSX/CSV
- [XLSX Multi Sheet Splitter](https://elysiatools.com/en/tools/xlsx-multi-sheet-splitter): Split a multi-sheet workbook into independent files by sheet name, with ZIP output
- [XLSX Sheet to CSV Pack](https://elysiatools.com/en/tools/xlsx-sheet-to-csv-pack): Export each Excel worksheet as an individual CSV file and include a manifest with schema/statistics

## Samples

- [XLS Samples](https://elysiatools.com/en/samples/xls-samples): Sample legacy Excel (XLS) files for binary spreadsheet parsing and import tests
- [CSV Samples](https://elysiatools.com/en/samples/csv-samples): Sample CSV files with various data types, sizes, and complexity levels
- [XLSX Samples](https://elysiatools.com/en/samples/xlsx-samples): Sample XLSX spreadsheets for worksheet parsing and data extraction testing
- [Windows String Processing - C# Samples](https://elysiatools.com/en/samples/windows-string-processing-csharp): Comprehensive C# string processing examples for Windows platform including string manipulation, splitting, joining, regex operations, and text analysis

## Related content

- [CSV Cleanup, Reshaping, and Delivery Workflow](https://elysiatools.com/en/hubs/csv-utility): Inspect CSV structure, keep the right columns, reshape rows, compare outputs, and split final files for dependable imports or reporting.