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Merge CSV Files

Merge multiple CSV files with the same columns into a single CSV.

Accepted

CSV

Limit

1 file · up to 10 MB

Result

CSVs → CSV

Handling

Auto cleanup after 2h

Usage

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Max file size: 10MB

Max files per run: 1

Supported formats: CSV

Upload two or more CSV files, up to 10MB per file. They will be merged into a single CSV.

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Files are uploaded and processed in the background. You will see links and previews when the run is finished.

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Input summary

PDF compression summary

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Pages

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CSV processing summary

Input rows

Output rows

Output files

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Output size

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How it works

1

Upload your CSV files

Select two or more CSV files that share the same column structure.

2

Files are combined in upload order

The header from the first file is kept. Data rows from all other files are appended below in the order they were uploaded.

3

Merged CSV is generated

A single output CSV containing all rows from every uploaded file is produced with one shared header row.

4

Download the combined file

Download the merged CSV and use it directly in a database import, analysis tool, or reporting pipeline.

🔗 Related tools 4 related tools

Split CSV File

Split a large CSV into multiple smaller CSV files with the same header.

Explore →

Clean CSV File

Clean a CSV by trimming spaces, removing empty rows, and optionally deduplicating rows.

Explore →

CSV to Excel (XLSX)

Convert a CSV file into a clean Excel (XLSX) spreadsheet.

Explore →

Excel (XLSX) to CSV

Convert an Excel (XLSX) file into a UTF-8 CSV file.

Explore →

About Merge CSV Files

When the same dataset is split across multiple CSV files — monthly exports, regional extracts, or paginated API downloads capped at 1000 rows each — merging them before analysis requires manually concatenating files or writing a script. This Merge CSV tool accepts any number of CSV files with the same column structure and outputs a single combined file. The header row from the first file is retained; data rows from all subsequent files are appended in upload order. If a file has a different column count, its rows a...

→ Merge twelve monthly sales CSV exports into one annual dataset before building a report. → Combine separate regional data extracts into a single file for a company-wide analysis. → Merge paginated API export files, each capped at 1000 rows, into one complete dataset. → Consolidate CSV exports from multiple team members before deduplication and reporting.

Related guides and workflows

Guide

How to Use Excel Viewer Online

Learn how to use Excel Viewer online. Upload an Excel file to inspect workbook metadata such as sheet names and counts.

Guide

How to Use Clean CSV File Online

Learn how to use Clean CSV File online. Clean a CSV by trimming spaces, removing empty rows, and optionally deduplicating rows.

Guide

How to Use CSV to Excel (XLSX) Online

Learn how to use CSV to Excel (XLSX) online. Convert a CSV file into a clean Excel (XLSX) spreadsheet.

📦 Supported formats 1 file types

CSV

❓ Frequently asked questions 4 answers

Yes, for a clean merge they should share the same column names and order. The first file defines the column template. Files with fewer columns get empty cells; files with extra columns get those columns truncated.

No. Only the header from the first file is included. Headers from subsequent files are detected and skipped so they do not appear as data rows in the merged result.

Free accounts can merge up to 5 files per run. Pro accounts remove this limit. Total combined file size must be within your plan upload limit.

No. The merge tool appends rows without deduplication. To remove duplicates, run the merged file through the Clean CSV tool afterwards.